/*
* Copyright 2010 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.config.generator;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import java.util.Map;
import com.alibaba.antx.config.ConfigException;
import com.alibaba.antx.config.generator.expr.CompositeExpression;
import com.alibaba.antx.config.generator.expr.Expression;
import com.alibaba.antx.config.generator.expr.ExpressionContext;
import com.alibaba.antx.config.generator.expr.ReferenceExpression;
import com.alibaba.antx.util.StringUtil;
import com.alibaba.antx.util.collection.ExtendedProperties;
public abstract class PropertiesLoader {
/**
* װ�������ļ���
*
* @param propsFile �����ļ�
* @param propsCharset װ�������ļ�ʱʹ�õı����ַ���
* @return �����ļ�������
*/
public static Map loadPropertiesFile(InputStream istream, String propsCharset, String url) {
return loadPropertiesFile(istream, propsCharset, url, true);
}
/**
* װ�������ļ���
*
* @param propsFile �����ļ�
* @param propsCharset װ�������ļ�ʱʹ�õı����ַ���
* @return �����ļ�������
*/
public static Map loadPropertiesFile(InputStream istream, String propsCharset, String url, boolean closeOnExit) {
ExtendedProperties props = new ExtendedProperties();
try {
props.load(istream, propsCharset, url);
} catch (IOException e) {
throw new ConfigException(e);
} finally {
if (istream != null) {
try {
istream.close();
} catch (IOException e) {
}
}
}
return props;
}
/**
* װ�������ļ���
*
* @param propsFile �����ļ�
* @param propsCharset װ�������ļ�ʱʹ�õı����ַ���
* @return �����ļ�������
*/
public static Map loadPropertiesFile(File propsFile, String propsCharset) {
ExtendedProperties props = new ExtendedProperties();
if (propsFile.exists()) {
try {
props.load(propsFile.toURI().toURL(), propsCharset);
} catch (IOException e) {
throw new ConfigException(e);
}
}
return props;
}
/**
* �����Դ�Դ���Ա��кϲ���Ŀ�����Ա�����������ģ���֮��
*
* @param dest Ŀ�����Ա�
* @param src Դ���Ա�
*/
public static void mergeProperties(Map dest, Map src) {
for (Iterator i = src.entrySet().iterator(); i.hasNext();) {
Map.Entry entry = (Map.Entry) i.next();
String name = (String) entry.getKey();
Object value = entry.getValue();
if (value instanceof String) {
Expression expr = CompositeExpression.parse((String) value);
if (expr != null) {
value = expr;
}
}
dest.put(name, value);
dest.put(StringUtil.getValidIdentifier(name), value);
}
}
/**
* ȡֵ�����㡣
*/
public static Object evaluate(String name, final Map props) {
return new ReferenceExpression(name).evaluate(new ExpressionContext() {
public Object get(String key) {
return props.get(key);
}
public void put(String key, Object value) {
props.put(key, value);
}
});
}
}