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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.runtime.webapp;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Set;
import javax.servlet.ServletContext;
import static org.apache.tuscany.runtime.webapp.Constants.APPLICATION_SCDL_PATH_DEFAULT;
import static org.apache.tuscany.runtime.webapp.Constants.APPLICATION_SCDL_PATH_PARAM;
import static org.apache.tuscany.runtime.webapp.Constants.BOOTDIR_DEFAULT;
import static org.apache.tuscany.runtime.webapp.Constants.BOOTDIR_PARAM;
import static org.apache.tuscany.runtime.webapp.Constants.RUNTIME_DEFAULT;
import static org.apache.tuscany.runtime.webapp.Constants.RUNTIME_PARAM;
import static org.apache.tuscany.runtime.webapp.Constants.SYSTEM_SCDL_PATH_DEFAULT;
import static org.apache.tuscany.runtime.webapp.Constants.SYSTEM_SCDL_PATH_PARAM;
/**
* @version $Rev$ $Date$
*/
public class WebappUtilImpl implements WebappUtil {
private final ServletContext servletContext;
public WebappUtilImpl(ServletContext servletContext) {
this.servletContext = servletContext;
}
public WebappRuntime getRuntime(ClassLoader bootClassLoader) throws TuscanyInitException {
try {
String className = getInitParameter(RUNTIME_PARAM, RUNTIME_DEFAULT);
return (WebappRuntime) bootClassLoader.loadClass(className).newInstance();
} catch (InstantiationException e) {
throw new TuscanyInitException(e);
} catch (IllegalAccessException e) {
throw new TuscanyInitException(e);
} catch (ClassNotFoundException e) {
throw new TuscanyInitException("Runtime Implementation not found", e);
}
}
public ClassLoader getBootClassLoader(ClassLoader webappClassLoader) throws InvalidResourcePath {
String bootDirName = getInitParameter(BOOTDIR_PARAM, BOOTDIR_DEFAULT);
Set paths = servletContext.getResourcePaths(bootDirName);
if (paths == null) {
// nothing in boot directory, assume everything is in the webapp classloader
return webappClassLoader;
}
URL[] urls = new URL[paths.size()];
int i = 0;
for (Object path : paths) {
try {
urls[i++] = servletContext.getResource((String) path);
} catch (MalformedURLException e) {
throw new InvalidResourcePath(APPLICATION_SCDL_PATH_PARAM, path.toString(), e);
}
}
return new URLClassLoader(urls, webappClassLoader);
}
public URL getSystemScdl(ClassLoader bootClassLoader) throws InvalidResourcePath {
String path = getInitParameter(SYSTEM_SCDL_PATH_PARAM, SYSTEM_SCDL_PATH_DEFAULT);
try {
return getScdlURL(path, bootClassLoader);
} catch (MalformedURLException e) {
throw new InvalidResourcePath(SYSTEM_SCDL_PATH_PARAM, path, e);
}
}
public String getApplicationName() {
String name = servletContext.getServletContextName();
if (name == null) {
name = "application";
}
return name;
}
public URL getApplicationScdl(ClassLoader bootClassLoader) throws InvalidResourcePath {
String path = getInitParameter(APPLICATION_SCDL_PATH_PARAM, APPLICATION_SCDL_PATH_DEFAULT);
try {
return getScdlURL(path, bootClassLoader);
} catch (MalformedURLException e) {
throw new InvalidResourcePath(APPLICATION_SCDL_PATH_PARAM, path, e);
}
}
public URL getScdlURL(String path, ClassLoader classLoader) throws MalformedURLException {
URL ret = null;
if (path.charAt(0) == '/') {
// user supplied an absolute path - look up as a webapp resource
ret = servletContext.getResource(path);
}
if (ret == null) {
// user supplied a relative path - look up as a boot classpath resource
ret = classLoader.getResource(path);
}
return ret;
}
public String getInitParameter(String name, String value) {
String result = servletContext.getInitParameter(name);
if (result != null && result.length() != 0) {
return result;
}
return value;
}
}
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