Resource utils
/**
*Copyright [2008] [dennis zhuang]
*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.google.code.yanf4j.util;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;
import java.util.Properties;
/**
* Resource utils
*
* @author dennis
*
*/
public class ResourcesUtils extends Object {
/** */
/**
* Returns the URL of the resource on the classpath
*
* @param resource
* The resource to find
* @throws IOException
* If the resource cannot be found or read
* @return The resource
*/
public static URL getResourceURL(String resource) throws IOException {
URL url = null;
ClassLoader loader = ResourcesUtils.class.getClassLoader();
if (loader != null) {
url = loader.getResource(resource);
}
if (url == null) {
url = ClassLoader.getSystemResource(resource);
}
if (url == null) {
throw new IOException("Could not find resource " + resource);
}
return url;
}
/** */
/**
* Returns the URL of the resource on the classpath
*
* @param loader
* The classloader used to load the resource
* @param resource
* The resource to find
* @throws IOException
* If the resource cannot be found or read
* @return The resource
*/
public static URL getResourceURL(ClassLoader loader, String resource)
throws IOException {
URL url = null;
if (loader != null) {
url = loader.getResource(resource);
}
if (url == null) {
url = ClassLoader.getSystemResource(resource);
}
if (url == null) {
throw new IOException("Could not find resource " + resource);
}
return url;
}
/** */
/**
* Returns a resource on the classpath as a Stream object
*
* @param resource
* The resource to find
* @throws IOException
* If the resource cannot be found or read
* @return The resource
*/
public static InputStream getResourceAsStream(String resource)
throws IOException {
InputStream in = null;
ClassLoader loader = ResourcesUtils.class.getClassLoader();
if (loader != null) {
in = loader.getResourceAsStream(resource);
}
if (in == null) {
in = ClassLoader.getSystemResourceAsStream(resource);
}
if (in == null) {
throw new IOException("Could not find resource " + resource);
}
return in;
}
/** */
/**
* Returns a resource on the classpath as a Stream object
*
* @param loader
* The classloader used to load the resource
* @param resource
* The resource to find
* @throws IOException
* If the resource cannot be found or read
* @return The resource
*/
public static InputStream getResourceAsStream(ClassLoader loader,
String resource) throws IOException {
InputStream in = null;
if (loader != null) {
in = loader.getResourceAsStream(resource);
}
if (in == null) {
in = ClassLoader.getSystemResourceAsStream(resource);
}
if (in == null) {
throw new IOException("Could not find resource " + resource);
}
return in;
}
/** */
/**
* Returns a resource on the classpath as a Properties object
*
* @param resource
* The resource to find
* @throws IOException
* If the resource cannot be found or read
* @return The resource
*/
public static Properties getResourceAsProperties(String resource)
throws IOException {
Properties props = new Properties();
InputStream in = null;
String propfile = resource;
in = getResourceAsStream(propfile);
props.load(in);
in.close();
return props;
}
/** */
/**
* Returns a resource on the classpath as a Properties object
*
* @param loader
* The classloader used to load the resource
* @param resource
* The resource to find
* @throws IOException
* If the resource cannot be found or read
* @return The resource
*/
public static Properties getResourceAsProperties(ClassLoader loader,
String resource) throws IOException {
Properties props = new Properties();
InputStream in = null;
String propfile = resource;
in = getResourceAsStream(loader, propfile);
props.load(in);
in.close();
return props;
}
/** */
/**
* Returns a resource on the classpath as a Reader object
*
* @param resource
* The resource to find
* @throws IOException
* If the resource cannot be found or read
* @return The resource
*/
public static InputStreamReader getResourceAsReader(String resource)
throws IOException {
return new InputStreamReader(getResourceAsStream(resource));
}
/** */
/**
* Returns a resource on the classpath as a Reader object
*
* @param loader
* The classloader used to load the resource
* @param resource
* The resource to find
* @throws IOException
* If the resource cannot be found or read
* @return The resource
*/
public static Reader getResourceAsReader(ClassLoader loader, String resource)
throws IOException {
return new InputStreamReader(getResourceAsStream(loader, resource));
}
/** */
/**
* Returns a resource on the classpath as a File object
*
* @param resource
* The resource to find
* @throws IOException
* If the resource cannot be found or read
* @return The resource
*/
public static File getResourceAsFile(String resource) throws IOException {
return new File(getResourceURL(resource).getFile());
}
/** */
/**
* Returns a resource on the classpath as a File object
*
* @param loader
* The classloader used to load the resource
* @param resource
* The resource to find
* @throws IOException
* If the resource cannot be found or read
* @return The resource
*/
public static File getResourceAsFile(ClassLoader loader, String resource)
throws IOException {
return new File(getResourceURL(loader, resource).getFile());
}
}
Related examples in the same category
