/*
* Copyright 2002-2006 the original author or authors.
*
* 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 org.springframework.core.io.support;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Enumeration;
import java.util.Properties;
import org.springframework.core.io.Resource;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
/**
* Convenient utility methods for loading of <code>java.util.Properties</code>,
* performing standard handling of input streams.
*
* <p>For more configurable properties loading, including the option of a
* customized encoding, consider using the PropertiesLoaderSupport class.
*
* @author Juergen Hoeller
* @author Rob Harrop
* @since 2.0
* @see PropertiesLoaderSupport
*/
public abstract class PropertiesLoaderUtils {
/**
* Load properties from the given resource.
* @param resource the resource to load from
* @return the populated Properties instance
* @throws IOException if loading failed
*/
public static Properties loadProperties(Resource resource) throws IOException {
Properties props = new Properties();
fillProperties(props, resource);
return props;
}
/**
* Fill the given properties from the given resource.
* @param props the Properties instance to fill
* @param resource the resource to load from
* @throws IOException if loading failed
*/
public static void fillProperties(Properties props, Resource resource) throws IOException {
InputStream is = resource.getInputStream();
try {
props.load(is);
}
finally {
is.close();
}
}
/**
* Load all properties from the given class path resource,
* using the default class loader.
* <p>Merges properties if more than one resource of the same name
* found in the class path.
* @param resourceName the name of the class path resource
* @return the populated Properties instance
* @throws IOException if loading failed
*/
public static Properties loadAllProperties(String resourceName) throws IOException {
return loadAllProperties(resourceName, null);
}
/**
* Load all properties from the given class path resource,
* using the given class loader.
* <p>Merges properties if more than one resource of the same name
* found in the class path.
* @param resourceName the name of the class path resource
* @param classLoader the ClassLoader to use for loading
* (or <code>null</code> to use the default class loader)
* @return the populated Properties instance
* @throws IOException if loading failed
*/
public static Properties loadAllProperties(String resourceName, ClassLoader classLoader) throws IOException {
Assert.notNull(resourceName, "Resource name must not be null");
ClassLoader clToUse = classLoader;
if (clToUse == null) {
clToUse = ClassUtils.getDefaultClassLoader();
}
Properties properties = new Properties();
Enumeration urls = clToUse.getResources(resourceName);
while (urls.hasMoreElements()) {
URL url = (URL) urls.nextElement();
InputStream is = null;
try {
URLConnection con = url.openConnection();
con.setUseCaches(false);
is = con.getInputStream();
properties.load(is);
}
finally {
if (is != null) {
is.close();
}
}
}
return properties;
}
}
|