com.alibaba.antx.util.collection.ExtendedProperties Maven / Gradle / Ivy
/*
* Copyright (c) 2002-2012 Alibaba Group Holding Limited.
* All rights reserved.
*
* 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.alibaba.antx.util.collection;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;
import java.util.Properties;
import com.alibaba.antx.util.StringUtil;
import com.alibaba.antx.util.i18n.LocaleInfo;
/**
* 扩展Properties类, 支持从Reader中读取unicode字符。
*
* @author Michael Zhou
*/
public class ExtendedProperties extends Properties {
private static final long serialVersionUID = 3258126960071555380L;
private static final String KEY_VALUE_SEPARATORS = "= \t\r\n\f";
private static final String STRICT_KEY_VALUE_SEPARATORS = "=";
private static final String WHITE_SPACE_CHARS = " \t\r\n\f";
/**
* 从指定的properties文件中，以默认的编码字符集读取属性和值。
*
* @param resource properties文件
* @throws IOException 读文件失败或文件格式错误
*/
public synchronized void load(URL resource) throws IOException {
load(resource, null);
}
/**
* 从指定的properties文件中，以指定的编码字符集读取属性和值。
*
* @param resource properties文件
* @param charset 编码字符集
* @throws IOException 读文件失败或文件格式错误
*/
public synchronized void load(URL resource, String charset) throws IOException {
charset = getCharset(charset);
InputStream istream = null;
try {
istream = resource.openStream();
if (!(istream instanceof BufferedInputStream)) {
istream = new BufferedInputStream(istream, 8192);
}
load(new InputStreamReader(istream, charset), resource.toExternalForm());
} finally {
if (istream != null) {
try {
istream.close();
} catch (IOException e) {
}
}
}
}
/**
* 从指定的输入流中，以默认的编码字符集读取属性和值。
*
* @param istream 输入字符流
* @throws IOException 读文件失败或文件格式错误
*/
@Override
public void load(InputStream istream) throws IOException {
load(istream, null, null);
}
/**
* 从指定的输入流中，以指定的编码字符集读取属性和值。
*
* @param istream 输入字符流
* @throws IOException 读文件失败或文件格式错误
*/
public synchronized void load(InputStream istream, String charset, String url) throws IOException {
if (charset == null) {
charset = getCharset(null);
}
if (!(istream instanceof BufferedInputStream)) {
istream = new BufferedInputStream(istream, 8192);
}
load(new InputStreamReader(istream, charset), url);
}
private String getCharset(String charset) {
if (charset == null) {
charset = LocaleInfo.getDefault().getCharset();
}
return charset;
}
/**
* 从指定的输入流中，以默认的编码字符集读取属性和值。
*
* @param reader 输入字符流
* @throws IOException 读文件失败或文件格式错误
*/
private synchronized void load(Reader reader, String url) throws IOException {
BufferedReader in = reader instanceof BufferedReader ? (BufferedReader) reader : new BufferedReader(reader);
int lineNumber = 0;
while (true) {
// 取得下一行
String line = in.readLine();
lineNumber++;
if (line == null) {
return;
}
// 去掉行首尾的空白
line = line.trim();
if (line.length() > 0) {
// 如果该行以“\”结尾，则看作是上一行的继续
char firstChar = line.charAt(0);
if (firstChar != '#' && firstChar != '!') {
while (isContinueLine(line)) {
String nextLine = in.readLine();
if (nextLine == null) {
nextLine = "";
}
String loppedLine = line.substring(0, line.length() - 1);
// 去掉新行上的空格
int startIndex = 0;
for (startIndex = 0; startIndex < nextLine.length(); startIndex++) {
if (WHITE_SPACE_CHARS.indexOf(nextLine.charAt(startIndex)) == -1) {
break;
}
}
nextLine = nextLine.substring(startIndex, nextLine.length());
line = new String(loppedLine + nextLine);
}
// 找到key的开始处
int len = line.length();
int keyStart;
for (keyStart = 0; keyStart < len; keyStart++) {
if (WHITE_SPACE_CHARS.indexOf(line.charAt(keyStart)) == -1) {
break;
}
}
// 忽略空行
if (keyStart == len) {
continue;
}
// 查找key和value的分界符
int separatorIndex;
for (separatorIndex = keyStart; separatorIndex < len; separatorIndex++) {
char currentChar = line.charAt(separatorIndex);
if (currentChar == '\\') {
separatorIndex++;
} else if (KEY_VALUE_SEPARATORS.indexOf(currentChar) != -1) {
break;
}
}
// 跳过key后面的空白（如果有的话）
int valueIndex;
for (valueIndex = separatorIndex; valueIndex < len; valueIndex++) {
if (WHITE_SPACE_CHARS.indexOf(line.charAt(valueIndex)) == -1) {
break;
}
}
// 跳过一个非空白的key-value分界符
if (valueIndex < len) {
if (STRICT_KEY_VALUE_SEPARATORS.indexOf(line.charAt(valueIndex)) != -1) {
valueIndex++;
}
}
// 跳过分界符后面的空白
while (valueIndex < len) {
if (WHITE_SPACE_CHARS.indexOf(line.charAt(valueIndex)) == -1) {
break;
}
valueIndex++;
}
String key = line.substring(keyStart, separatorIndex);
String value = separatorIndex < len ? line.substring(valueIndex, len) : "";
// 转换key和value
key = loadConvert(key, url, lineNumber);
value = loadConvert(value, url, lineNumber);
put(key, value);
}
}
}
}
/**
* 判断该行是否和下一行是连续的行。
*
* @param line 指定行
* @return 如果是和下一行相连的，则返回true
*/
private boolean isContinueLine(String line) {
int slashCount = 0;
int index = line.length() - 1;
while (index >= 0 && line.charAt(index--) == '\\') {
slashCount++;
}
return slashCount % 2 == 1;
}
/**
* 将\uxxxx转换成unicode字符，将特殊符号转换成其原来的格式。
*
* @param str 要转换的字符串
* @return 转换后的字符串
*/
private String loadConvert(String str, String url, int lineNumber) {
char ch;
int len = str.length();
StringBuffer buffer = new StringBuffer(len);
if (StringUtil.isEmpty(url)) {
url = "";
}
for (int x = 0; x < len; ) {
ch = str.charAt(x++);
if (ch == '\\') {
ch = str.charAt(x++);
if (ch == 'u') {
// Read the xxxx
int value = 0;
for (int i = 0; i < 4; i++) {
ch = str.charAt(x++);
switch (ch) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
value = (value << 4) + ch - '0';
break;
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
value = (value << 4) + 10 + ch - 'a';
break;
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
value = (value << 4) + 10 + ch - 'A';
break;
default:
throw new IllegalArgumentException("Malformed \\uxxxx encoding at " + url + ", line "
+ lineNumber);
}
}
buffer.append((char) value);
} else {
if (ch == '\\') {
ch = '\\';
} else if (ch == 't') {
ch = '\t';
} else if (ch == 'r') {
ch = '\r';
} else if (ch == 'n') {
ch = '\n';
} else if (ch == 'f') {
ch = '\f';
} else {
throw new IllegalArgumentException("Invalid \\" + ch + " at " + url + ", line " + lineNumber);
}
buffer.append(ch);
}
} else {
buffer.append(ch);
}
}
return buffer.toString();
}
}
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