DateSorter.java revision 9066cfe9886ac131c34d59ed0e2d287b0e3c0087
1/* 2 * Copyright (C) 2006 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 android.webkit; 18 19import android.content.Context; 20import android.content.res.Resources; 21 22import java.util.Calendar; 23import java.util.Date; 24 25/** 26 * Sorts dates into the following groups: 27 * Today 28 * Yesterday 29 * five days ago 30 * one month ago 31 * older than a month ago 32 */ 33 34public class DateSorter { 35 36 private static final String LOGTAG = "webkit"; 37 38 /** must be >= 3 */ 39 public static final int DAY_COUNT = 5; 40 41 private long [] mBins = new long[DAY_COUNT]; 42 private String [] mLabels = new String[DAY_COUNT]; 43 44 private static final int NUM_DAYS_AGO = 5; 45 46 Date mDate = new Date(); 47 Calendar mCal = Calendar.getInstance(); 48 49 /** 50 * @param context Application context 51 */ 52 public DateSorter(Context context) { 53 Resources resources = context.getResources(); 54 55 Calendar c = Calendar.getInstance(); 56 beginningOfDay(c); 57 58 // Create the bins 59 mBins[0] = c.getTimeInMillis(); // Today 60 c.roll(Calendar.DAY_OF_YEAR, -1); 61 mBins[1] = c.getTimeInMillis(); // Yesterday 62 c.roll(Calendar.DAY_OF_YEAR, -(NUM_DAYS_AGO - 1)); 63 mBins[2] = c.getTimeInMillis(); // Five days ago 64 c.roll(Calendar.DAY_OF_YEAR, NUM_DAYS_AGO); // move back to today 65 c.roll(Calendar.MONTH, -1); 66 mBins[3] = c.getTimeInMillis(); // One month ago 67 c.roll(Calendar.MONTH, -1); 68 mBins[4] = c.getTimeInMillis(); // Over one month ago 69 70 // build labels 71 mLabels[0] = context.getText(com.android.internal.R.string.today).toString(); 72 mLabels[1] = context.getText(com.android.internal.R.string.yesterday).toString(); 73 74 int resId = com.android.internal.R.plurals.num_days_ago; 75 String format = resources.getQuantityString(resId, NUM_DAYS_AGO); 76 mLabels[2] = String.format(format, NUM_DAYS_AGO); 77 78 mLabels[3] = context.getText(com.android.internal.R.string.oneMonthDurationPast).toString(); 79 mLabels[4] = context.getText(com.android.internal.R.string.beforeOneMonthDurationPast) 80 .toString(); 81 } 82 83 /** 84 * @param time time since the Epoch in milliseconds, such as that 85 * returned by Calendar.getTimeInMillis() 86 * @return an index from 0 to (DAY_COUNT - 1) that identifies which 87 * date bin this date belongs to 88 */ 89 public int getIndex(long time) { 90 // Lame linear search 91 for (int i = 0; i < DAY_COUNT; i++) { 92 if (time > mBins[i]) return i; 93 } 94 return DAY_COUNT - 1; 95 } 96 97 /** 98 * @param index date bin index as returned by getIndex() 99 * @return string label suitable for display to user 100 */ 101 public String getLabel(int index) { 102 return mLabels[index]; 103 } 104 105 106 /** 107 * @param index date bin index as returned by getIndex() 108 * @return date boundary at given index 109 */ 110 public long getBoundary(int index) { 111 return mBins[index]; 112 } 113 114 /** 115 * Calcuate 12:00am by zeroing out hour, minute, second, millisecond 116 */ 117 private Calendar beginningOfDay(Calendar c) { 118 c.set(Calendar.HOUR_OF_DAY, 0); 119 c.set(Calendar.MINUTE, 0); 120 c.set(Calendar.SECOND, 0); 121 c.set(Calendar.MILLISECOND, 0); 122 return c; 123 } 124} 125