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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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/*
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*文件名：Contact.java
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* 修改人：蒙程
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* 修改时间：2025-12-13
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* 修改内容：增加代码注释，标注的代码行数共有21行
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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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*Contact类是联系人工具类
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*
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*<P>根据“提供的电话号码反向查询联系人姓名”的能力，并带内存缓存，避免重复查库。</P>
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* 本类所有方法均为静态，无需实例化。
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*
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* @author 蒙程
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* @version 1.0
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* @since [起始版本]
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*/
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public class Contact {
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//HashMap表示联系人和电话号码之间的映射关系。只声明，不new，是延迟初始化的表现
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private static HashMap<String, String> sContactCache;
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private static final String TAG = "Contact";
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//说明电话号码格式，可兼容国际区号、前缀0等多种格式
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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 "
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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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/**
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* 根据电话号码获取联系人姓名
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* <P>优先读取内存缓存，未命中时查询系统联系人数据库，并将结果写入缓存。</P>
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* @param context 上下文，用于访问ContentResolver
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* @param phoneNumber 待查询的电话号码（可为国际格式、带前缀 0 等）
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* @return 联系人姓名；未匹配到或者发生异常时，返回＠code null
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* @throws
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* @see android.provider.ContactsContract.CommonDataKinds
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*/
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public static String getContact(Context context, String phoneNumber) {
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//不到真正要用的时候，不给对象分配内存。第一次被调用时才new。
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if(sContactCache == null) {
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sContactCache = new HashMap<String, String>();
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}
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//缓存命中，直接返回电话号码
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if(sContactCache.containsKey(phoneNumber)) {
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return sContactCache.get(phoneNumber);
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}
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//构造匹配串，提取数字核心部分
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String selection = CALLER_ID_SELECTION.replace("+",
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PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
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//cursor是数据库游标，初始位置是-1；query把SQL拼装好后交给系统联系人Provider
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Cursor cursor = context.getContentResolver().query(
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Data.CONTENT_URI,
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new String [] { Phone.DISPLAY_NAME },
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selection,
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new String[] { phoneNumber },
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null);
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//指针移到第一行，成功返回true
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if (cursor != null && cursor.moveToFirst()) {
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try {
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String name = cursor.getString(0);
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sContactCache.put(phoneNumber, name); //将号码-姓名键值对放进内存缓存
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return name;
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} catch (IndexOutOfBoundsException e) { //捕获异常，索引超出列范围的情况，返回错误日志
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Log.e(TAG, " Cursor get string error " + e.toString());
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return null;
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} finally { //无论是否发生异常都必须释放cursor。
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cursor.close();
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}
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} else { //查询失败，输出日志信息
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Log.d(TAG, "No contact matched with number:" + phoneNumber);
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return null;
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}
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}
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}
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