1/*
2 * Copyright (C) 2010 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
17package com.android.email;
18
19import android.content.Context;
20import android.content.res.Resources;
21import android.content.res.TypedArray;
22import android.graphics.Paint;
23
24/**
25 * Helper class to load resources.
26 */
27public class ResourceHelper {
28    public final static int UNDEFINED_RESOURCE_ID = -1;
29
30    private static ResourceHelper sInstance;
31    private final Context mContext;
32    private final Resources mResources;
33
34    private final int[] mAccountColors;
35    private final Paint[] mAccountColorPaints;
36    private final TypedArray mAccountColorArray;
37
38    private ResourceHelper(Context context) {
39        mContext = context.getApplicationContext();
40        mResources = mContext.getResources();
41
42        mAccountColorArray = mResources.obtainTypedArray(R.array.combined_view_account_colors);
43        mAccountColors = mResources.getIntArray(R.array.combined_view_account_colors);
44        mAccountColorPaints = new Paint[mAccountColors.length];
45        for (int i = 0; i < mAccountColors.length; i++) {
46            Paint p = new Paint();
47            p.setColor(mAccountColors[i]);
48            mAccountColorPaints[i] = p;
49        }
50    }
51
52    public static synchronized ResourceHelper getInstance(Context context) {
53        if (sInstance == null) {
54            sInstance = new ResourceHelper(context);
55        }
56        return sInstance;
57    }
58
59    /* package */ int getAccountColorIndex(long accountId) {
60        // The account ID is 1-based, so -1.
61        // Use abs so that it'd work for -1 as well.
62        return Math.abs((int) ((accountId - 1) % mAccountColors.length));
63    }
64
65    /**
66     * @return color for an account.
67     */
68    public int getAccountColor(long accountId) {
69        return mAccountColors[getAccountColorIndex(accountId)];
70    }
71
72    /**
73     * @return The resource ID for an account color.
74     * Otherwise, {@value #UNDEFINED_RESOURCE_ID} if color was not specified via ID.
75     */
76    public int getAccountColorId(long accountId) {
77        return mAccountColorArray.getResourceId(getAccountColorIndex(accountId),
78                UNDEFINED_RESOURCE_ID);
79    }
80
81    /**
82     * @return {@link Paint} equivalent to {@link #getAccountColor}.
83     */
84    public Paint getAccountColorPaint(long accountId) {
85        return mAccountColorPaints[getAccountColorIndex(accountId)];
86    }
87}
88