Igor Murashkin | 3c40a04 | 2014-04-22 15:05:50 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package android.hardware.camera2.marshal.impl; |
| 17 | |
| 18 | import android.hardware.camera2.marshal.Marshaler; |
| 19 | import android.hardware.camera2.marshal.MarshalQueryable; |
| 20 | import android.hardware.camera2.marshal.MarshalRegistry; |
| 21 | import android.hardware.camera2.utils.TypeReference; |
| 22 | import android.util.Log; |
| 23 | |
| 24 | import java.lang.reflect.Array; |
| 25 | import java.nio.ByteBuffer; |
| 26 | import java.util.ArrayList; |
| 27 | |
| 28 | import static android.hardware.camera2.impl.CameraMetadataNative.*; |
| 29 | import static android.hardware.camera2.marshal.MarshalHelpers.*; |
| 30 | |
| 31 | /** |
| 32 | * Marshal any array {@code T}. |
| 33 | * |
| 34 | * <p>To marshal any {@code T} to/from a native type, the marshaler for T to/from that native type |
| 35 | * also has to exist.</p> |
| 36 | * |
| 37 | * <p>{@code T} can be either a T2[] where T2 is an object type, or a P[] where P is a |
| 38 | * built-in primitive (e.g. int[], float[], etc).</p> |
| 39 | |
| 40 | * @param <T> the type of the array (e.g. T = int[], or T = Rational[]) |
| 41 | */ |
| 42 | public class MarshalQueryableArray<T> implements MarshalQueryable<T> { |
| 43 | |
| 44 | private static final String TAG = MarshalQueryableArray.class.getSimpleName(); |
| 45 | private static final boolean VERBOSE = Log.isLoggable(TAG, Log.VERBOSE); |
| 46 | |
| 47 | private class MarshalerArray extends Marshaler<T> { |
| 48 | private final Class<T> mClass; |
| 49 | private final Marshaler<?> mComponentMarshaler; |
| 50 | private final Class<?> mComponentClass; |
| 51 | |
| 52 | @SuppressWarnings("unchecked") |
| 53 | protected MarshalerArray(TypeReference<T> typeReference, int nativeType) { |
| 54 | super(MarshalQueryableArray.this, typeReference, nativeType); |
| 55 | |
| 56 | mClass = (Class<T>)typeReference.getRawType(); |
| 57 | |
| 58 | TypeReference<?> componentToken = typeReference.getComponentType(); |
| 59 | mComponentMarshaler = MarshalRegistry.getMarshaler(componentToken, mNativeType); |
| 60 | mComponentClass = componentToken.getRawType(); |
| 61 | } |
| 62 | |
| 63 | @Override |
| 64 | public void marshal(T value, ByteBuffer buffer) { |
| 65 | int length = Array.getLength(value); |
| 66 | for (int i = 0; i < length; ++i) { |
| 67 | marshalArrayElement(mComponentMarshaler, buffer, value, i); |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | @Override |
| 72 | public T unmarshal(ByteBuffer buffer) { |
| 73 | Object array; |
| 74 | |
| 75 | int elementSize = mComponentMarshaler.getNativeSize(); |
| 76 | |
| 77 | if (elementSize != Marshaler.NATIVE_SIZE_DYNAMIC) { |
| 78 | int remaining = buffer.remaining(); |
| 79 | int arraySize = remaining / elementSize; |
| 80 | |
| 81 | if (remaining % elementSize != 0) { |
| 82 | throw new UnsupportedOperationException("Arrays for " + mTypeReference |
| 83 | + " must be packed tighly into a multiple of " + elementSize |
| 84 | + "; but there are " + (remaining % elementSize) + " left over bytes"); |
| 85 | } |
| 86 | |
| 87 | if (VERBOSE) { |
| 88 | Log.v(TAG, String.format( |
| 89 | "Attempting to unpack array (count = %d, element size = %d, bytes " |
| 90 | + "remaining = %d) for type %s", |
| 91 | arraySize, elementSize, remaining, mClass)); |
| 92 | } |
| 93 | |
| 94 | array = Array.newInstance(mComponentClass, arraySize); |
| 95 | for (int i = 0; i < arraySize; ++i) { |
| 96 | Object elem = mComponentMarshaler.unmarshal(buffer); |
| 97 | Array.set(array, i, elem); |
| 98 | } |
| 99 | } else { |
| 100 | // Dynamic size, use an array list. |
| 101 | ArrayList<Object> arrayList = new ArrayList<Object>(); |
| 102 | |
| 103 | // Assumes array is packed tightly; no unused bytes allowed |
| 104 | while (buffer.hasRemaining()) { |
| 105 | Object elem = mComponentMarshaler.unmarshal(buffer); |
| 106 | arrayList.add(elem); |
| 107 | } |
| 108 | |
| 109 | int arraySize = arrayList.size(); |
| 110 | array = copyListToArray(arrayList, Array.newInstance(mComponentClass, arraySize)); |
| 111 | } |
| 112 | |
| 113 | if (buffer.remaining() != 0) { |
| 114 | Log.e(TAG, "Trailing bytes (" + buffer.remaining() + ") left over after unpacking " |
| 115 | + mClass); |
| 116 | } |
| 117 | |
| 118 | return mClass.cast(array); |
| 119 | } |
| 120 | |
| 121 | @Override |
| 122 | public int getNativeSize() { |
| 123 | return NATIVE_SIZE_DYNAMIC; |
| 124 | } |
| 125 | |
| 126 | @Override |
| 127 | public int calculateMarshalSize(T value) { |
| 128 | int elementSize = mComponentMarshaler.getNativeSize(); |
| 129 | int arrayLength = Array.getLength(value); |
| 130 | |
| 131 | if (elementSize != Marshaler.NATIVE_SIZE_DYNAMIC) { |
| 132 | // The fast way. Every element size is uniform. |
| 133 | return elementSize * arrayLength; |
| 134 | } else { |
| 135 | // The slow way. Accumulate size for each element. |
| 136 | int size = 0; |
| 137 | for (int i = 0; i < arrayLength; ++i) { |
| 138 | size += calculateElementMarshalSize(mComponentMarshaler, value, i); |
| 139 | } |
| 140 | |
| 141 | return size; |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | /* |
| 146 | * Helpers to avoid compiler errors regarding types with wildcards (?) |
| 147 | */ |
| 148 | |
| 149 | @SuppressWarnings("unchecked") |
| 150 | private <TElem> void marshalArrayElement(Marshaler<TElem> marshaler, |
| 151 | ByteBuffer buffer, Object array, int index) { |
| 152 | marshaler.marshal((TElem)Array.get(array, index), buffer); |
| 153 | } |
| 154 | |
| 155 | @SuppressWarnings("unchecked") |
| 156 | private Object copyListToArray(ArrayList<?> arrayList, Object arrayDest) { |
| 157 | return arrayList.toArray((T[]) arrayDest); |
| 158 | } |
| 159 | |
| 160 | @SuppressWarnings("unchecked") |
| 161 | private <TElem> int calculateElementMarshalSize(Marshaler<TElem> marshaler, |
| 162 | Object array, int index) { |
| 163 | Object elem = Array.get(array, index); |
| 164 | |
| 165 | return marshaler.calculateMarshalSize((TElem) elem); |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | @Override |
| 170 | public Marshaler<T> createMarshaler(TypeReference<T> managedType, int nativeType) { |
| 171 | return new MarshalerArray(managedType, nativeType); |
| 172 | } |
| 173 | |
| 174 | @Override |
| 175 | public boolean isTypeMappingSupported(TypeReference<T> managedType, int nativeType) { |
| 176 | // support both ConcreteType[] and GenericType<ConcreteType>[] |
| 177 | return managedType.getRawType().isArray(); |
| 178 | |
| 179 | // TODO: Should this recurse deeper and check that there is |
| 180 | // a valid marshaler for the ConcreteType as well? |
| 181 | } |
| 182 | } |