packages/DocumentsUI/src/com/android/documentsui/Shared.java

/*
 * Copyright (C) 2015 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 com.android.documentsui;

import android.content.Context;
import android.text.TextUtils;
import android.text.format.DateUtils;
import android.text.format.Time;

import java.text.Collator;
import java.util.ArrayList;
import java.util.List;

/** @hide */
public final class Shared {

    public static final String TAG = "Documents";

    public static final boolean DEBUG = true;

    /** Intent action name to pick a copy destination. */
    public static final String ACTION_PICK_COPY_DESTINATION =
            "com.android.documentsui.PICK_COPY_DESTINATION";

    /**
     * Extra boolean flag for {@link ACTION_PICK_COPY_DESTINATION}, which
     * specifies if the destination directory needs to create new directory or not.
     */
    public static final String EXTRA_DIRECTORY_COPY = "com.android.documentsui.DIRECTORY_COPY";
    public static final String EXTRA_STACK = "com.android.documentsui.STACK";

    /**
     * Extra flag used to store query of type String in the bundle.
     */
    public static final String EXTRA_QUERY = "query";

    /**
     * Extra flag used to store state of type State in the bundle.
     */
    public static final String EXTRA_STATE = "state";

    /**
     * Extra flag used to store type of DirectoryFragment's type ResultType type in the bundle.
     */
    public static final String EXTRA_TYPE = "type";

    /**
     * Extra flag used to store root of type RootInfo in the bundle.
     */
    public static final String EXTRA_ROOT = "root";

    /**
     * Extra flag used to store document of DocumentInfo type in the bundle.
     */
    public static final String EXTRA_DOC = "document";

    /**
     * Extra flag used to store DirectoryFragment's selection of Selection type in the bundle.
     */
    public static final String EXTRA_SELECTION = "selection";

    /**
     * Extra flag used to store DirectoryFragment's search mode of boolean type in the bundle.
     */
    public static final String EXTRA_SEARCH_MODE = "searchMode";

    /**
     * Extra flag used to store DirectoryFragment's ignore state of boolean type in the bundle.
     */
    public static final String EXTRA_IGNORE_STATE = "ignoreState";


    /**
     * String prefix used to indicate the document is a directory.
     */
    public static final char DIR_PREFIX = '\001';

    private static final Collator sCollator;

    static {
        sCollator = Collator.getInstance();
        sCollator.setStrength(Collator.SECONDARY);
    }

    /**
     * Generates a formatted quantity string.
     */
    public static final String getQuantityString(Context context, int resourceId, int quantity) {
        return context.getResources().getQuantityString(resourceId, quantity, quantity);
    }

    public static String formatTime(Context context, long when) {
        // TODO: DateUtils should make this easier
        Time then = new Time();
        then.set(when);
        Time now = new Time();
        now.setToNow();

        int flags = DateUtils.FORMAT_NO_NOON | DateUtils.FORMAT_NO_MIDNIGHT
                | DateUtils.FORMAT_ABBREV_ALL;

        if (then.year != now.year) {
            flags |= DateUtils.FORMAT_SHOW_YEAR | DateUtils.FORMAT_SHOW_DATE;
        } else if (then.yearDay != now.yearDay) {
            flags |= DateUtils.FORMAT_SHOW_DATE;
        } else {
            flags |= DateUtils.FORMAT_SHOW_TIME;
        }

        return DateUtils.formatDateTime(context, when, flags);
    }

    /**
     * A convenient way to transform any list into a (parcelable) ArrayList.
     * Uses cast if possible, else creates a new list with entries from {@code list}.
     */
    public static <T> ArrayList<T> asArrayList(List<T> list) {
        return list instanceof ArrayList
            ? (ArrayList<T>) list
            : new ArrayList<T>(list);
    }

    /**
     * Compare two strings against each other using system default collator in a
     * case-insensitive mode. Clusters strings prefixed with {@link DIR_PREFIX}
     * before other items.
     */
    public static int compareToIgnoreCaseNullable(String lhs, String rhs) {
        final boolean leftEmpty = TextUtils.isEmpty(lhs);
        final boolean rightEmpty = TextUtils.isEmpty(rhs);

        if (leftEmpty && rightEmpty) return 0;
        if (leftEmpty) return -1;
        if (rightEmpty) return 1;

        final boolean leftDir = (lhs.charAt(0) == DIR_PREFIX);
        final boolean rightDir = (rhs.charAt(0) == DIR_PREFIX);

        if (leftDir && !rightDir) return -1;
        if (rightDir && !leftDir) return 1;

        return sCollator.compare(lhs, rhs);
    }
}