core/java/android/os/BaseBundle.java

/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.os;

import android.annotation.Nullable;
import android.util.ArrayMap;
import android.util.Log;
import android.util.MathUtils;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Set;

/**
 * A mapping from String values to various types.
 */
public class BaseBundle {
    private static final String TAG = "Bundle";
    static final boolean DEBUG = false;

    // Keep in sync with frameworks/native/libs/binder/PersistableBundle.cpp.
    static final int BUNDLE_MAGIC = 0x4C444E42; // 'B' 'N' 'D' 'L'

    static final Parcel EMPTY_PARCEL;

    static {
        EMPTY_PARCEL = Parcel.obtain();
    }

    // Invariant - exactly one of mMap / mParcelledData will be null
    // (except inside a call to unparcel)

    ArrayMap<String, Object> mMap = null;

    /*
     * If mParcelledData is non-null, then mMap will be null and the
     * data are stored as a Parcel containing a Bundle.  When the data
     * are unparcelled, mParcelledData willbe set to null.
     */
    Parcel mParcelledData = null;

    /**
     * The ClassLoader used when unparcelling data from mParcelledData.
     */
    private ClassLoader mClassLoader;

    /**
     * Constructs a new, empty Bundle that uses a specific ClassLoader for
     * instantiating Parcelable and Serializable objects.
     *
     * @param loader An explicit ClassLoader to use when instantiating objects
     * inside of the Bundle.
     * @param capacity Initial size of the ArrayMap.
     */
    BaseBundle(@Nullable ClassLoader loader, int capacity) {
        mMap = capacity > 0 ?
                new ArrayMap<String, Object>(capacity) : new ArrayMap<String, Object>();
        mClassLoader = loader == null ? getClass().getClassLoader() : loader;
    }

    /**
     * Constructs a new, empty Bundle.
     */
    BaseBundle() {
        this((ClassLoader) null, 0);
    }

    /**
     * Constructs a Bundle whose data is stored as a Parcel.  The data
     * will be unparcelled on first contact, using the assigned ClassLoader.
     *
     * @param parcelledData a Parcel containing a Bundle
     */
    BaseBundle(Parcel parcelledData) {
        readFromParcelInner(parcelledData);
    }

    BaseBundle(Parcel parcelledData, int length) {
        readFromParcelInner(parcelledData, length);
    }

    /**
     * Constructs a new, empty Bundle that uses a specific ClassLoader for
     * instantiating Parcelable and Serializable objects.
     *
     * @param loader An explicit ClassLoader to use when instantiating objects
     * inside of the Bundle.
     */
    BaseBundle(ClassLoader loader) {
        this(loader, 0);
    }

    /**
     * Constructs a new, empty Bundle sized to hold the given number of
     * elements. The Bundle will grow as needed.
     *
     * @param capacity the initial capacity of the Bundle
     */
    BaseBundle(int capacity) {
        this((ClassLoader) null, capacity);
    }

    /**
     * Constructs a Bundle containing a copy of the mappings from the given
     * Bundle.
     *
     * @param b a Bundle to be copied.
     */
    BaseBundle(BaseBundle b) {
        if (b.mParcelledData != null) {
            if (b.mParcelledData == EMPTY_PARCEL) {
                mParcelledData = EMPTY_PARCEL;
            } else {
                mParcelledData = Parcel.obtain();
                mParcelledData.appendFrom(b.mParcelledData, 0, b.mParcelledData.dataSize());
                mParcelledData.setDataPosition(0);
            }
        } else {
            mParcelledData = null;
        }

        if (b.mMap != null) {
            mMap = new ArrayMap<String, Object>(b.mMap);
        } else {
            mMap = null;
        }

        mClassLoader = b.mClassLoader;
    }

    /**
     * TODO: optimize this later (getting just the value part of a Bundle
     * with a single pair) once Bundle.forPair() above is implemented
     * with a special single-value Map implementation/serialization.
     *
     * Note: value in single-pair Bundle may be null.
     *
     * @hide
     */
    public String getPairValue() {
        unparcel();
        int size = mMap.size();
        if (size > 1) {
            Log.w(TAG, "getPairValue() used on Bundle with multiple pairs.");
        }
        if (size == 0) {
            return null;
        }
        Object o = mMap.valueAt(0);
        try {
            return (String) o;
        } catch (ClassCastException e) {
            typeWarning("getPairValue()", o, "String", e);
            return null;
        }
    }

    /**
     * Changes the ClassLoader this Bundle uses when instantiating objects.
     *
     * @param loader An explicit ClassLoader to use when instantiating objects
     * inside of the Bundle.
     */
    void setClassLoader(ClassLoader loader) {
        mClassLoader = loader;
    }

    /**
     * Return the ClassLoader currently associated with this Bundle.
     */
    ClassLoader getClassLoader() {
        return mClassLoader;
    }

    /**
     * If the underlying data are stored as a Parcel, unparcel them
     * using the currently assigned class loader.
     */
    /* package */ synchronized void unparcel() {
        if (mParcelledData == null) {
            if (DEBUG) Log.d(TAG, "unparcel " + Integer.toHexString(System.identityHashCode(this))
                    + ": no parcelled data");
            return;
        }

        if (mParcelledData == EMPTY_PARCEL) {
            if (DEBUG) Log.d(TAG, "unparcel " + Integer.toHexString(System.identityHashCode(this))
                    + ": empty");
            if (mMap == null) {
                mMap = new ArrayMap<String, Object>(1);
            } else {
                mMap.erase();
            }
            mParcelledData = null;
            return;
        }

        int N = mParcelledData.readInt();
        if (DEBUG) Log.d(TAG, "unparcel " + Integer.toHexString(System.identityHashCode(this))
                + ": reading " + N + " maps");
        if (N < 0) {
            return;
        }
        if (mMap == null) {
            mMap = new ArrayMap<String, Object>(N);
        } else {
            mMap.erase();
            mMap.ensureCapacity(N);
        }
        mParcelledData.readArrayMapInternal(mMap, N, mClassLoader);
        mParcelledData.recycle();
        mParcelledData = null;
        if (DEBUG) Log.d(TAG, "unparcel " + Integer.toHexString(System.identityHashCode(this))
                + " final map: " + mMap);
    }

    /**
     * @hide
     */
    public boolean isParcelled() {
        return mParcelledData != null;
    }

    /**
     * Returns the number of mappings contained in this Bundle.
     *
     * @return the number of mappings as an int.
     */
    public int size() {
        unparcel();
        return mMap.size();
    }

    /**
     * Returns true if the mapping of this Bundle is empty, false otherwise.
     */
    public boolean isEmpty() {
        unparcel();
        return mMap.isEmpty();
    }

    /**
     * Removes all elements from the mapping of this Bundle.
     */
    public void clear() {
        unparcel();
        mMap.clear();
    }

    /**
     * Returns true if the given key is contained in the mapping
     * of this Bundle.
     *
     * @param key a String key
     * @return true if the key is part of the mapping, false otherwise
     */
    public boolean containsKey(String key) {
        unparcel();
        return mMap.containsKey(key);
    }

    /**
     * Returns the entry with the given key as an object.
     *
     * @param key a String key
     * @return an Object, or null
     */
    @Nullable
    public Object get(String key) {
        unparcel();
        return mMap.get(key);
    }

    /**
     * Removes any entry with the given key from the mapping of this Bundle.
     *
     * @param key a String key
     */
    public void remove(String key) {
        unparcel();
        mMap.remove(key);
    }

    /**
     * Inserts all mappings from the given PersistableBundle into this BaseBundle.
     *
     * @param bundle a PersistableBundle
     */
    public void putAll(PersistableBundle bundle) {
        unparcel();
        bundle.unparcel();
        mMap.putAll(bundle.mMap);
    }

    /**
     * Inserts all mappings from the given Map into this BaseBundle.
     *
     * @param map a Map
     */
    void putAll(ArrayMap map) {
        unparcel();
        mMap.putAll(map);
    }

    /**
     * Returns a Set containing the Strings used as keys in this Bundle.
     *
     * @return a Set of String keys
     */
    public Set<String> keySet() {
        unparcel();
        return mMap.keySet();
    }

    /**
     * Inserts a Boolean value into the mapping of this Bundle, replacing
     * any existing value for the given key.  Either key or value may be null.
     *
     * @param key a String, or null
     * @param value a boolean
     */
    public void putBoolean(@Nullable String key, boolean value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a byte value into the mapping of this Bundle, replacing
     * any existing value for the given key.
     *
     * @param key a String, or null
     * @param value a byte
     */
    void putByte(@Nullable String key, byte value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a char value into the mapping of this Bundle, replacing
     * any existing value for the given key.
     *
     * @param key a String, or null
     * @param value a char
     */
    void putChar(@Nullable String key, char value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a short value into the mapping of this Bundle, replacing
     * any existing value for the given key.
     *
     * @param key a String, or null
     * @param value a short
     */
    void putShort(@Nullable String key, short value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts an int value into the mapping of this Bundle, replacing
     * any existing value for the given key.
     *
     * @param key a String, or null
     * @param value an int
     */
    public void putInt(@Nullable String key, int value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a long value into the mapping of this Bundle, replacing
     * any existing value for the given key.
     *
     * @param key a String, or null
     * @param value a long
     */
    public void putLong(@Nullable String key, long value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a float value into the mapping of this Bundle, replacing
     * any existing value for the given key.
     *
     * @param key a String, or null
     * @param value a float
     */
    void putFloat(@Nullable String key, float value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a double value into the mapping of this Bundle, replacing
     * any existing value for the given key.
     *
     * @param key a String, or null
     * @param value a double
     */
    public void putDouble(@Nullable String key, double value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a String value into the mapping of this Bundle, replacing
     * any existing value for the given key.  Either key or value may be null.
     *
     * @param key a String, or null
     * @param value a String, or null
     */
    public void putString(@Nullable String key, @Nullable String value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a CharSequence value into the mapping of this Bundle, replacing
     * any existing value for the given key.  Either key or value may be null.
     *
     * @param key a String, or null
     * @param value a CharSequence, or null
     */
    void putCharSequence(@Nullable String key, @Nullable CharSequence value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts an ArrayList<Integer> value into the mapping of this Bundle, replacing
     * any existing value for the given key.  Either key or value may be null.
     *
     * @param key a String, or null
     * @param value an ArrayList<Integer> object, or null
     */
    void putIntegerArrayList(@Nullable String key, @Nullable ArrayList<Integer> value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts an ArrayList<String> value into the mapping of this Bundle, replacing
     * any existing value for the given key.  Either key or value may be null.
     *
     * @param key a String, or null
     * @param value an ArrayList<String> object, or null
     */
    void putStringArrayList(@Nullable String key, @Nullable ArrayList<String> value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts an ArrayList<CharSequence> value into the mapping of this Bundle, replacing
     * any existing value for the given key.  Either key or value may be null.
     *
     * @param key a String, or null
     * @param value an ArrayList<CharSequence> object, or null
     */
    void putCharSequenceArrayList(@Nullable String key, @Nullable ArrayList<CharSequence> value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a Serializable value into the mapping of this Bundle, replacing
     * any existing value for the given key.  Either key or value may be null.
     *
     * @param key a String, or null
     * @param value a Serializable object, or null
     */
    void putSerializable(@Nullable String key, @Nullable Serializable value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a boolean array value into the mapping of this Bundle, replacing
     * any existing value for the given key.  Either key or value may be null.
     *
     * @param key a String, or null
     * @param value a boolean array object, or null
     */
    public void putBooleanArray(@Nullable String key, @Nullable boolean[] value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a byte array value into the mapping of this Bundle, replacing
     * any existing value for the given key.  Either key or value may be null.
     *
     * @param key a String, or null
     * @param value a byte array object, or null
     */
    void putByteArray(@Nullable String key, @Nullable byte[] value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a short array value into the mapping of this Bundle, replacing
     * any existing value for the given key.  Either key or value may be null.
     *
     * @param key a String, or null
     * @param value a short array object, or null
     */
    void putShortArray(@Nullable String key, @Nullable short[] value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a char array value into the mapping of this Bundle, replacing
     * any existing value for the given key.  Either key or value may be null.
     *
     * @param key a String, or null
     * @param value a char array object, or null
     */
    void putCharArray(@Nullable String key, @Nullable char[] value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts an int array value into the mapping of this Bundle, replacing
     * any existing value for the given key.  Either key or value may be null.
     *
     * @param key a String, or null
     * @param value an int array object, or null
     */
    public void putIntArray(@Nullable String key, @Nullable int[] value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a long array value into the mapping of this Bundle, replacing
     * any existing value for the given key.  Either key or value may be null.
     *
     * @param key a String, or null
     * @param value a long array object, or null
     */
    public void putLongArray(@Nullable String key, @Nullable long[] value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a float array value into the mapping of this Bundle, replacing
     * any existing value for the given key.  Either key or value may be null.
     *
     * @param key a String, or null
     * @param value a float array object, or null
     */
    void putFloatArray(@Nullable String key, @Nullable float[] value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a double array value into the mapping of this Bundle, replacing
     * any existing value for the given key.  Either key or value may be null.
     *
     * @param key a String, or null
     * @param value a double array object, or null
     */
    public void putDoubleArray(@Nullable String key, @Nullable double[] value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a String array value into the mapping of this Bundle, replacing
     * any existing value for the given key.  Either key or value may be null.
     *
     * @param key a String, or null
     * @param value a String array object, or null
     */
    public void putStringArray(@Nullable String key, @Nullable String[] value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Inserts a CharSequence array value into the mapping of this Bundle, replacing
     * any existing value for the given key.  Either key or value may be null.
     *
     * @param key a String, or null
     * @param value a CharSequence array object, or null
     */
    void putCharSequenceArray(@Nullable String key, @Nullable CharSequence[] value) {
        unparcel();
        mMap.put(key, value);
    }

    /**
     * Returns the value associated with the given key, or false if
     * no mapping of the desired type exists for the given key.
     *
     * @param key a String
     * @return a boolean value
     */
    public boolean getBoolean(String key) {
        unparcel();
        if (DEBUG) Log.d(TAG, "Getting boolean in "
                + Integer.toHexString(System.identityHashCode(this)));
        return getBoolean(key, false);
    }

    // Log a message if the value was non-null but not of the expected type
    void typeWarning(String key, Object value, String className,
            Object defaultValue, ClassCastException e) {
        StringBuilder sb = new StringBuilder();
        sb.append("Key ");
        sb.append(key);
        sb.append(" expected ");
        sb.append(className);
        sb.append(" but value was a ");
        sb.append(value.getClass().getName());
        sb.append(".  The default value ");
        sb.append(defaultValue);
        sb.append(" was returned.");
        Log.w(TAG, sb.toString());
        Log.w(TAG, "Attempt to cast generated internal exception:", e);
    }

    void typeWarning(String key, Object value, String className,
            ClassCastException e) {
        typeWarning(key, value, className, "<null>", e);
    }

    /**
     * Returns the value associated with the given key, or defaultValue if
     * no mapping of the desired type exists for the given key.
     *
     * @param key a String
     * @param defaultValue Value to return if key does not exist
     * @return a boolean value
     */
    public boolean getBoolean(String key, boolean defaultValue) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return defaultValue;
        }
        try {
            return (Boolean) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "Boolean", defaultValue, e);
            return defaultValue;
        }
    }

    /**
     * Returns the value associated with the given key, or (byte) 0 if
     * no mapping of the desired type exists for the given key.
     *
     * @param key a String
     * @return a byte value
     */
    byte getByte(String key) {
        unparcel();
        return getByte(key, (byte) 0);
    }

    /**
     * Returns the value associated with the given key, or defaultValue if
     * no mapping of the desired type exists for the given key.
     *
     * @param key a String
     * @param defaultValue Value to return if key does not exist
     * @return a byte value
     */
    Byte getByte(String key, byte defaultValue) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return defaultValue;
        }
        try {
            return (Byte) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "Byte", defaultValue, e);
            return defaultValue;
        }
    }

    /**
     * Returns the value associated with the given key, or (char) 0 if
     * no mapping of the desired type exists for the given key.
     *
     * @param key a String
     * @return a char value
     */
    char getChar(String key) {
        unparcel();
        return getChar(key, (char) 0);
    }

    /**
     * Returns the value associated with the given key, or defaultValue if
     * no mapping of the desired type exists for the given key.
     *
     * @param key a String
     * @param defaultValue Value to return if key does not exist
     * @return a char value
     */
    char getChar(String key, char defaultValue) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return defaultValue;
        }
        try {
            return (Character) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "Character", defaultValue, e);
            return defaultValue;
        }
    }

    /**
     * Returns the value associated with the given key, or (short) 0 if
     * no mapping of the desired type exists for the given key.
     *
     * @param key a String
     * @return a short value
     */
    short getShort(String key) {
        unparcel();
        return getShort(key, (short) 0);
    }

    /**
     * Returns the value associated with the given key, or defaultValue if
     * no mapping of the desired type exists for the given key.
     *
     * @param key a String
     * @param defaultValue Value to return if key does not exist
     * @return a short value
     */
    short getShort(String key, short defaultValue) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return defaultValue;
        }
        try {
            return (Short) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "Short", defaultValue, e);
            return defaultValue;
        }
    }

    /**
     * Returns the value associated with the given key, or 0 if
     * no mapping of the desired type exists for the given key.
     *
     * @param key a String
     * @return an int value
     */
    public int getInt(String key) {
        unparcel();
        return getInt(key, 0);
    }

    /**
     * Returns the value associated with the given key, or defaultValue if
     * no mapping of the desired type exists for the given key.
     *
     * @param key a String
     * @param defaultValue Value to return if key does not exist
     * @return an int value
     */
   public int getInt(String key, int defaultValue) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return defaultValue;
        }
        try {
            return (Integer) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "Integer", defaultValue, e);
            return defaultValue;
        }
    }

    /**
     * Returns the value associated with the given key, or 0L if
     * no mapping of the desired type exists for the given key.
     *
     * @param key a String
     * @return a long value
     */
    public long getLong(String key) {
        unparcel();
        return getLong(key, 0L);
    }

    /**
     * Returns the value associated with the given key, or defaultValue if
     * no mapping of the desired type exists for the given key.
     *
     * @param key a String
     * @param defaultValue Value to return if key does not exist
     * @return a long value
     */
    public long getLong(String key, long defaultValue) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return defaultValue;
        }
        try {
            return (Long) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "Long", defaultValue, e);
            return defaultValue;
        }
    }

    /**
     * Returns the value associated with the given key, or 0.0f if
     * no mapping of the desired type exists for the given key.
     *
     * @param key a String
     * @return a float value
     */
    float getFloat(String key) {
        unparcel();
        return getFloat(key, 0.0f);
    }

    /**
     * Returns the value associated with the given key, or defaultValue if
     * no mapping of the desired type exists for the given key.
     *
     * @param key a String
     * @param defaultValue Value to return if key does not exist
     * @return a float value
     */
    float getFloat(String key, float defaultValue) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return defaultValue;
        }
        try {
            return (Float) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "Float", defaultValue, e);
            return defaultValue;
        }
    }

    /**
     * Returns the value associated with the given key, or 0.0 if
     * no mapping of the desired type exists for the given key.
     *
     * @param key a String
     * @return a double value
     */
    public double getDouble(String key) {
        unparcel();
        return getDouble(key, 0.0);
    }

    /**
     * Returns the value associated with the given key, or defaultValue if
     * no mapping of the desired type exists for the given key.
     *
     * @param key a String
     * @param defaultValue Value to return if key does not exist
     * @return a double value
     */
    public double getDouble(String key, double defaultValue) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return defaultValue;
        }
        try {
            return (Double) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "Double", defaultValue, e);
            return defaultValue;
        }
    }

    /**
     * Returns the value associated with the given key, or null if
     * no mapping of the desired type exists for the given key or a null
     * value is explicitly associated with the key.
     *
     * @param key a String, or null
     * @return a String value, or null
     */
    @Nullable
    public String getString(@Nullable String key) {
        unparcel();
        final Object o = mMap.get(key);
        try {
            return (String) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "String", e);
            return null;
        }
    }

    /**
     * Returns the value associated with the given key, or defaultValue if
     * no mapping of the desired type exists for the given key or if a null
     * value is explicitly associated with the given key.
     *
     * @param key a String, or null
     * @param defaultValue Value to return if key does not exist or if a null
     *     value is associated with the given key.
     * @return the String value associated with the given key, or defaultValue
     *     if no valid String object is currently mapped to that key.
     */
    public String getString(@Nullable String key, String defaultValue) {
        final String s = getString(key);
        return (s == null) ? defaultValue : s;
    }

    /**
     * Returns the value associated with the given key, or null if
     * no mapping of the desired type exists for the given key or a null
     * value is explicitly associated with the key.
     *
     * @param key a String, or null
     * @return a CharSequence value, or null
     */
    @Nullable
    CharSequence getCharSequence(@Nullable String key) {
        unparcel();
        final Object o = mMap.get(key);
        try {
            return (CharSequence) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "CharSequence", e);
            return null;
        }
    }

    /**
     * Returns the value associated with the given key, or defaultValue if
     * no mapping of the desired type exists for the given key or if a null
     * value is explicitly associated with the given key.
     *
     * @param key a String, or null
     * @param defaultValue Value to return if key does not exist or if a null
     *     value is associated with the given key.
     * @return the CharSequence value associated with the given key, or defaultValue
     *     if no valid CharSequence object is currently mapped to that key.
     */
    CharSequence getCharSequence(@Nullable String key, CharSequence defaultValue) {
        final CharSequence cs = getCharSequence(key);
        return (cs == null) ? defaultValue : cs;
    }

    /**
     * Returns the value associated with the given key, or null if
     * no mapping of the desired type exists for the given key or a null
     * value is explicitly associated with the key.
     *
     * @param key a String, or null
     * @return a Serializable value, or null
     */
    @Nullable
    Serializable getSerializable(@Nullable String key) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return null;
        }
        try {
            return (Serializable) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "Serializable", e);
            return null;
        }
    }

    /**
     * Returns the value associated with the given key, or null if
     * no mapping of the desired type exists for the given key or a null
     * value is explicitly associated with the key.
     *
     * @param key a String, or null
     * @return an ArrayList<String> value, or null
     */
    @Nullable
    ArrayList<Integer> getIntegerArrayList(@Nullable String key) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return null;
        }
        try {
            return (ArrayList<Integer>) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "ArrayList<Integer>", e);
            return null;
        }
    }

    /**
     * Returns the value associated with the given key, or null if
     * no mapping of the desired type exists for the given key or a null
     * value is explicitly associated with the key.
     *
     * @param key a String, or null
     * @return an ArrayList<String> value, or null
     */
    @Nullable
    ArrayList<String> getStringArrayList(@Nullable String key) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return null;
        }
        try {
            return (ArrayList<String>) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "ArrayList<String>", e);
            return null;
        }
    }

    /**
     * Returns the value associated with the given key, or null if
     * no mapping of the desired type exists for the given key or a null
     * value is explicitly associated with the key.
     *
     * @param key a String, or null
     * @return an ArrayList<CharSequence> value, or null
     */
    @Nullable
    ArrayList<CharSequence> getCharSequenceArrayList(@Nullable String key) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return null;
        }
        try {
            return (ArrayList<CharSequence>) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "ArrayList<CharSequence>", e);
            return null;
        }
    }

    /**
     * Returns the value associated with the given key, or null if
     * no mapping of the desired type exists for the given key or a null
     * value is explicitly associated with the key.
     *
     * @param key a String, or null
     * @return a boolean[] value, or null
     */
    @Nullable
    public boolean[] getBooleanArray(@Nullable String key) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return null;
        }
        try {
            return (boolean[]) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "byte[]", e);
            return null;
        }
    }

    /**
     * Returns the value associated with the given key, or null if
     * no mapping of the desired type exists for the given key or a null
     * value is explicitly associated with the key.
     *
     * @param key a String, or null
     * @return a byte[] value, or null
     */
    @Nullable
    byte[] getByteArray(@Nullable String key) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return null;
        }
        try {
            return (byte[]) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "byte[]", e);
            return null;
        }
    }

    /**
     * Returns the value associated with the given key, or null if
     * no mapping of the desired type exists for the given key or a null
     * value is explicitly associated with the key.
     *
     * @param key a String, or null
     * @return a short[] value, or null
     */
    @Nullable
    short[] getShortArray(@Nullable String key) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return null;
        }
        try {
            return (short[]) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "short[]", e);
            return null;
        }
    }

    /**
     * Returns the value associated with the given key, or null if
     * no mapping of the desired type exists for the given key or a null
     * value is explicitly associated with the key.
     *
     * @param key a String, or null
     * @return a char[] value, or null
     */
    @Nullable
    char[] getCharArray(@Nullable String key) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return null;
        }
        try {
            return (char[]) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "char[]", e);
            return null;
        }
    }

    /**
     * Returns the value associated with the given key, or null if
     * no mapping of the desired type exists for the given key or a null
     * value is explicitly associated with the key.
     *
     * @param key a String, or null
     * @return an int[] value, or null
     */
    @Nullable
    public int[] getIntArray(@Nullable String key) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return null;
        }
        try {
            return (int[]) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "int[]", e);
            return null;
        }
    }

    /**
     * Returns the value associated with the given key, or null if
     * no mapping of the desired type exists for the given key or a null
     * value is explicitly associated with the key.
     *
     * @param key a String, or null
     * @return a long[] value, or null
     */
    @Nullable
    public long[] getLongArray(@Nullable String key) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return null;
        }
        try {
            return (long[]) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "long[]", e);
            return null;
        }
    }

    /**
     * Returns the value associated with the given key, or null if
     * no mapping of the desired type exists for the given key or a null
     * value is explicitly associated with the key.
     *
     * @param key a String, or null
     * @return a float[] value, or null
     */
    @Nullable
    float[] getFloatArray(@Nullable String key) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return null;
        }
        try {
            return (float[]) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "float[]", e);
            return null;
        }
    }

    /**
     * Returns the value associated with the given key, or null if
     * no mapping of the desired type exists for the given key or a null
     * value is explicitly associated with the key.
     *
     * @param key a String, or null
     * @return a double[] value, or null
     */
    @Nullable
    public double[] getDoubleArray(@Nullable String key) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return null;
        }
        try {
            return (double[]) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "double[]", e);
            return null;
        }
    }

    /**
     * Returns the value associated with the given key, or null if
     * no mapping of the desired type exists for the given key or a null
     * value is explicitly associated with the key.
     *
     * @param key a String, or null
     * @return a String[] value, or null
     */
    @Nullable
    public String[] getStringArray(@Nullable String key) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return null;
        }
        try {
            return (String[]) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "String[]", e);
            return null;
        }
    }

    /**
     * Returns the value associated with the given key, or null if
     * no mapping of the desired type exists for the given key or a null
     * value is explicitly associated with the key.
     *
     * @param key a String, or null
     * @return a CharSequence[] value, or null
     */
    @Nullable
    CharSequence[] getCharSequenceArray(@Nullable String key) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return null;
        }
        try {
            return (CharSequence[]) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "CharSequence[]", e);
            return null;
        }
    }

    /**
     * Writes the Bundle contents to a Parcel, typically in order for
     * it to be passed through an IBinder connection.
     * @param parcel The parcel to copy this bundle to.
     */
    void writeToParcelInner(Parcel parcel, int flags) {
        // Keep implementation in sync with writeToParcel() in
        // frameworks/native/libs/binder/PersistableBundle.cpp.
        if (mParcelledData != null) {
            if (mParcelledData == EMPTY_PARCEL) {
                parcel.writeInt(0);
            } else {
                int length = mParcelledData.dataSize();
                parcel.writeInt(length);
                parcel.writeInt(BUNDLE_MAGIC);
                parcel.appendFrom(mParcelledData, 0, length);
            }
        } else {
            // Special case for empty bundles.
            if (mMap == null || mMap.size() <= 0) {
                parcel.writeInt(0);
                return;
            }
            int lengthPos = parcel.dataPosition();
            parcel.writeInt(-1); // dummy, will hold length
            parcel.writeInt(BUNDLE_MAGIC);

            int startPos = parcel.dataPosition();
            parcel.writeArrayMapInternal(mMap);
            int endPos = parcel.dataPosition();

            // Backpatch length
            parcel.setDataPosition(lengthPos);
            int length = endPos - startPos;
            parcel.writeInt(length);
            parcel.setDataPosition(endPos);
        }
    }

    /**
     * Reads the Parcel contents into this Bundle, typically in order for
     * it to be passed through an IBinder connection.
     * @param parcel The parcel to overwrite this bundle from.
     */
    void readFromParcelInner(Parcel parcel) {
        // Keep implementation in sync with readFromParcel() in
        // frameworks/native/libs/binder/PersistableBundle.cpp.
        int length = parcel.readInt();
        readFromParcelInner(parcel, length);
    }

    private void readFromParcelInner(Parcel parcel, int length) {
        if (length < 0) {
            throw new RuntimeException("Bad length in parcel: " + length);

        } else if (length == 0) {
            // Empty Bundle or end of data.
            mParcelledData = EMPTY_PARCEL;
            return;
        }

        int magic = parcel.readInt();
        if (magic != BUNDLE_MAGIC) {
            //noinspection ThrowableInstanceNeverThrown
            throw new IllegalStateException("Bad magic number for Bundle: 0x"
                    + Integer.toHexString(magic));
        }

        // Advance within this Parcel
        int offset = parcel.dataPosition();
        parcel.setDataPosition(MathUtils.addOrThrow(offset, length));

        Parcel p = Parcel.obtain();
        p.setDataPosition(0);
        p.appendFrom(parcel, offset, length);
        if (DEBUG) Log.d(TAG, "Retrieving "  + Integer.toHexString(System.identityHashCode(this))
                + ": " + length + " bundle bytes starting at " + offset);
        p.setDataPosition(0);

        mParcelledData = p;
    }
}