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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.micode.notes.data;
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import android.content.Context;
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import android.database.Cursor;
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import android.provider.ContactsContract.CommonDataKinds.Phone;
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import android.provider.ContactsContract.Data;
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import android.telephony.PhoneNumberUtils;
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import android.util.Log;
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import java.util.HashMap;
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/**
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* <b>联系人查询工具类</b>
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* <p>
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* 主要负责根据电话号码从Android数据库中检索联系人姓名。
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* </p>
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*
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* <h3>核心功能：</h3>
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* <ul>
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* <li>基于电话号码查找姓名。</li>
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* <li>维护 {@code HashMap} 缓存，减少 IPC 调用次数。</li>
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* <li>处理国际化号码格式匹配问题。</li>
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* </ul>
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*
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* @author 林迪文
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* @version 1.0
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* @see android.provider.ContactsContract
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*/
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public class Contact {
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//键值对，用于缓存<姓名,文本>，提高查找速度。
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private static HashMap<String, String> sContactCache;
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//fianl意思是常量，TAG为Contact的“别名”。
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private static final String TAG = "Contact";
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//这是个SQL语句，CALLER_ID_SELECTION是个字符串，作用是构建匹配模式，用and连接了3个部分：电话匹配、数据类型需是电话、号码必须存在于快速查找表中
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private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL(" + Phone.NUMBER
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+ ",?) AND " + Data.MIMETYPE + "='" + Phone.CONTENT_ITEM_TYPE + "'"
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+ " AND " + Data.RAW_CONTACT_ID + " IN " //Data哪来的
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+ "(SELECT raw_contact_id "
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+ " FROM phone_lookup"
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+ " WHERE min_match = '+')";
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//主函数，输入电话，根据context，返回人名
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public static String getContact(Context context, String phoneNumber) {
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if(sContactCache == null) {
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sContactCache = new HashMap<String, String>();
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} //初次调用getContact时，创建缓存
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if(sContactCache.containsKey(phoneNumber)) {
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return sContactCache.get(phoneNumber);
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} //缓存命中
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String selection = CALLER_ID_SELECTION.replace("+",
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PhoneNumberUtils.toCallerIDMinMatch(phoneNumber)); //用处理过的电话号码，替代CALLER_ID_SELECTION的+。
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Cursor cursor = context.getContentResolver().query(
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Data.CONTENT_URI, //查找对象
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new String [] { Phone.DISPLAY_NAME }, //需要返回的是名字这一列
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selection, //查找条件
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new String[] { phoneNumber }, //query可以将phoneNumber填到selection的'？'中
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null); //不需排序
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if (cursor != null && cursor.moveToFirst()) { //cursor.moveToFirst()为true代表至少有一条记录
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try {
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String name = cursor.getString(0);
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sContactCache.put(phoneNumber, name);
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return name;
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} catch (IndexOutOfBoundsException e) { //越界报错
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Log.e(TAG, " Cursor get string error " + e.toString());
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return null;
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} finally {
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cursor.close(); //关闭进程，防止内存泄露
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}
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}
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else {
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Log.d(TAG, "No contact matched with number:" + phoneNumber); //没找到
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return null;
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}
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}
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}
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