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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.tuscany.sca.common.java.io;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.JarURLConnection;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
/**
* Helper class for I/O operations
* @tuscany.spi.extension.asclient
*/
public class IOHelper {
public static InputStream openStream(URL url) throws IOException {
// Handle file:<relative path> which strictly speaking is not a valid file URL
File file = toFile(url);
if (file != null) {
return new FileInputStream(file);
}
URLConnection connection = url.openConnection();
if (connection instanceof JarURLConnection) {
// See http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5041014
connection.setUseCaches(false);
}
InputStream is = connection.getInputStream();
return is;
}
public static void close(InputStream is) {
if (is != null) {
try {
is.close();
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
}
/**
* Escape the space in URL string
* @param uri
* @return
*/
public static URI createURI(String uri) {
if (uri == null) {
return null;
}
if (uri.indexOf('%') != -1) {
// Avoid double-escaping
return URI.create(uri);
}
int index = uri.indexOf(':');
String scheme = null;
String ssp = uri;
if (index != -1) {
scheme = uri.substring(0, index);
ssp = uri.substring(index + 1);
}
try {
return new URI(scheme, ssp, null);
} catch (URISyntaxException e) {
throw new IllegalArgumentException(e);
}
}
public static URI toURI(URL url) {
if (url == null) {
return null;
}
return createURI(url.toString());
}
public static URL normalize(URL url) {
// Make sure the trailing / is added to the file directory URL so that
// URLClassLoader can load classes from that
try {
File file = toFile(url);
if (file != null) {
return file.toURI().toURL();
} else {
return toURI(url).toURL();
}
} catch (MalformedURLException e) {
throw new IllegalArgumentException(e);
}
}
/**
* Returns the File object representing the given URL.
*
* @param url
* @return
*/
public static File toFile(URL url) {
if (url == null || !url.getProtocol().equals("file")) {
return null;
} else {
String filename = url.getFile().replace('/', File.separatorChar);
int pos = 0;
while ((pos = filename.indexOf('%', pos)) >= 0) {
if (pos + 2 < filename.length()) {
String hexStr = filename.substring(pos + 1, pos + 3);
char ch = (char)Integer.parseInt(hexStr, 16);
filename = filename.substring(0, pos) + ch + filename.substring(pos + 3);
}
}
return new File(filename);
}
}
/**
* Returns the location of the classpath entry, JAR, WAR etc. containing the given class.
*
* @param clazz
* @return
*/
public static URL codeLocation(Class<?> clazz) {
URL url = clazz.getProtectionDomain().getCodeSource().getLocation();
if (url == null) {
url = clazz.getResource("/" + clazz.getName().replace('.', '/') + ".class");
}
return url;
}
/**
* Returns a location string as a URL
* @param location
* @return
*/
public static URL getLocationAsURL(String location) {
URI uri = IOHelper.createURI(location);
if (uri.getScheme() == null) {
uri = new File(location).toURI();
}
try {
return uri.toURL();
} catch (MalformedURLException e) {
throw new IllegalArgumentException(location, e);
}
}
}
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