AOO410/main/ridljar/source/unoloader/com/sun/star/lib/unoloader/UnoClassLoader.java - openoffice - Git at Google

 /**************************************************************
  *
  * 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 com.sun.star.lib.unoloader;

 import java.io.IOException;
 import java.lang.reflect.InvocationTargetException;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLClassLoader;
 import java.util.jar.Attributes;
 import java.util.jar.Manifest;
 import java.util.jar.JarInputStream;

 /**
  * The root UNO class loader.
  *
  * <p>This class loader is able to load all published URE classes, including the
  * classes representing the published URE UNO types.  For consistency, it is
  * important that within each Java UNO environment there is one instance of this
  * class loader that is the defining class loader of all published URE classes
  * (and hence of all unpublished URE classes, too) and of all classes
  * representing UNO types (the published URE UNO types, any unpublished URE UNO
  * types, and any additional UNO types introduced by components; for the latter,
  * {@link #addURL} may be necessary).</p>
  *
  * <p><em>This is an internal, unstable class of the Uno Runtime Environment; it
  * should not be used by client code.</em></p>
  *
  * @since UDK 3.2.0
  */
 public final class UnoClassLoader extends URLClassLoader {
     /**
      * Instantiates the root UNO class loader.
      *
      * @param base a base URL relative to which the URE JARs
      * (<code>java_uno.jar</code>, <code>juh.jar</code>, <code>jurt.jar</code>,
      * <code>ridl.jar</code>) can be found; must not be <code>null</code>.
      *
      * @param classPath an array of URLs that form the class path of this class
      * loader; may be <code>null</code>, which is the same as an empty array.
      * The URLs are interpreted in the same way as the arguments of a {@link
      * URLClassLoader}.
      *
      * @param parent the parent class loader for delegation.
      *
      * @throws MalformedURLException if the given <code>base</code> URL is
      * malformed.
      */
     public UnoClassLoader(URL base, URL[] classPath, ClassLoader parent)
         throws MalformedURLException
     {
         super(createUrls(base, classPath), parent);
     }

     /**
      * Obtains a class loader for a UNO JAR.
      *
      * @param jar the URL of a UNO JAR; must not be <code>null</code>.
      *
      * @param mainAttributes represents the main section of the manifest of the
      * given JAR <code>jar</code>; <code>null</code> if the given JAR does not
      * have a manifest.  (This redundant parameter is there for performance
      * reasons, as typically the caller of this method already has this
      * information available.)
      *
      * @return an appropriate class loader; will never be <code>null</code>.
      *
      * @throws MalformedURLException if the given <code>jar</code> URL or any of
      * the UNO-Type-Path URLs specified in the given JAR are malformed.
      */
     public ClassLoader getClassLoader(URL jar, Attributes mainAttributes)
         throws MalformedURLException
     {
         String path = mainAttributes == null ?
             null : mainAttributes.getValue("UNO-Type-Path");
         if (path == null) {
             path = "<>";
         }
         for (int i = 0; i < path.length();) {
             while (i < path.length() && path.charAt(i) == ' ') {
                 ++i;
             }
             if (i < path.length()) {
                 String url;
                 if (path.charAt(i) == '<') {
                     int j = path.indexOf('>', i + 1);
                     if (j < 0) {
                         url = path.substring(i + 1);
                         i = path.length();
                     } else {
                         url = path.substring(i + 1, j);
                         i = j + 1;
                     }
                 } else {
                     int j = path.indexOf(' ', i + 1);
                     if (j < 0) {
                         j = path.length();
                     }
                     url = path.substring(i, j);
                     i = j;
                 }
                 addURL(new URL(jar, url));
             }
         }
         return URLClassLoader.newInstance(new URL[] { jar }, this);
     }

     /**
      * Executes a UNO JAR.
      *
      * @param jar the URL of a UNO JAR that specifies a Main-Class; must not be
      * <code>null</code>.
      *
      * @param arguments any arguments passed to the <code>main</code> method of
      * the specified Main-Class of the given JAR <code>jar</code>; must not be
      * <code>null</code>.
      *
      * @throws IOException if there are any problems processing the given JAR
      * <code>jar</code>.
      *
      * @throws ClassNotFoundException if the given JAR <code>jar</code> does not
      * specify a Main-Class, or if the specified Main-Class cannot be found.
      *
      * @throws NoSuchMethodException if the specified Main-Class of the given
      * JAR <code>jar</code> does not have an appropriate <code>main</code>
      * method.
      *
      * @throws InvocationTargetException if an exception occurs while executing
      * the <code>main</code> method of the specified Main-Class of the given JAR
      * <code>jar</code>.
      */
     public void execute(URL jar, String[] arguments)
         throws IOException, ClassNotFoundException, NoSuchMethodException,
         InvocationTargetException
     {
         Attributes attr = getJarMainAttributes(jar);
         String name = attr == null
             ? null : attr.getValue(Attributes.Name.MAIN_CLASS);
         if (name == null) {
             throw new ClassNotFoundException(
                 jar + " does not specify a main class");
         }
         try {
             getClassLoader(jar, attr).loadClass(name.replace('/', '.')).
                 getMethod("main", new Class[] { String[].class }).
                 invoke(null, new Object[] { arguments });
         } catch (IllegalAccessException e) {
             throw new RuntimeException("impossible " + e);
         }
     }

     /**
      * Obtains the main section of the manifest of a JAR.
      *
      * @param jar the URL of a JAR; must not be <code>null</code>.
      *
      * @return the representation of the main section of the manifest of the
      * given JAR <code>jar</code>, or <code>null</code> if the given JAR does
      * not have a manifest.
      *
      * @throws IOException if there are any problems processing the given JAR
      * <code>jar</code>.
      */
     public static Attributes getJarMainAttributes(URL jar) throws IOException {
         JarInputStream s = new JarInputStream(jar.openStream());
         Manifest mf;
         try {
             mf = s.getManifest();
         } finally {
             s.close();
         }
         return mf == null ? null : mf.getMainAttributes();
     }

     private static URL[] createUrls(URL base, URL[] classPath)
         throws MalformedURLException
     {
         final int JARS = 4;
         URL[] urls = new URL[JARS + (classPath == null ? 0 : classPath.length)];
         urls[0] = new URL(base, "java_uno.jar"); //TODO get rid of it here
         urls[1] = new URL(base, "juh.jar");
         urls[2] = new URL(base, "jurt.jar");
         urls[3] = new URL(base, "ridl.jar");
         if (classPath != null) {
             System.arraycopy(classPath, 0, urls, JARS, classPath.length);
         }
         return urls;
     }
 }
	/**************************************************************
	*
	* 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 com.sun.star.lib.unoloader;

	import java.io.IOException;
	import java.lang.reflect.InvocationTargetException;
	import java.net.MalformedURLException;
	import java.net.URL;
	import java.net.URLClassLoader;
	import java.util.jar.Attributes;
	import java.util.jar.Manifest;
	import java.util.jar.JarInputStream;

	/**
	* The root UNO class loader.
	*
	* <p>This class loader is able to load all published URE classes, including the
	* classes representing the published URE UNO types. For consistency, it is
	* important that within each Java UNO environment there is one instance of this
	* class loader that is the defining class loader of all published URE classes
	* (and hence of all unpublished URE classes, too) and of all classes
	* representing UNO types (the published URE UNO types, any unpublished URE UNO
	* types, and any additional UNO types introduced by components; for the latter,
	* {@link #addURL} may be necessary).</p>
	*
	* <p><em>This is an internal, unstable class of the Uno Runtime Environment; it
	* should not be used by client code.</em></p>
	*
	* @since UDK 3.2.0
	*/
	public final class UnoClassLoader extends URLClassLoader {
	/**
	* Instantiates the root UNO class loader.
	*
	* @param base a base URL relative to which the URE JARs
	* (<code>java_uno.jar</code>, <code>juh.jar</code>, <code>jurt.jar</code>,
	* <code>ridl.jar</code>) can be found; must not be <code>null</code>.
	*
	* @param classPath an array of URLs that form the class path of this class
	* loader; may be <code>null</code>, which is the same as an empty array.
	* The URLs are interpreted in the same way as the arguments of a {@link
	* URLClassLoader}.
	*
	* @param parent the parent class loader for delegation.
	*
	* @throws MalformedURLException if the given <code>base</code> URL is
	* malformed.
	*/
	public UnoClassLoader(URL base, URL[] classPath, ClassLoader parent)
	throws MalformedURLException
	{
	super(createUrls(base, classPath), parent);
	}

	/**
	* Obtains a class loader for a UNO JAR.
	*
	* @param jar the URL of a UNO JAR; must not be <code>null</code>.
	*
	* @param mainAttributes represents the main section of the manifest of the
	* given JAR <code>jar</code>; <code>null</code> if the given JAR does not
	* have a manifest. (This redundant parameter is there for performance
	* reasons, as typically the caller of this method already has this
	* information available.)
	*
	* @return an appropriate class loader; will never be <code>null</code>.
	*
	* @throws MalformedURLException if the given <code>jar</code> URL or any of
	* the UNO-Type-Path URLs specified in the given JAR are malformed.
	*/
	public ClassLoader getClassLoader(URL jar, Attributes mainAttributes)
	throws MalformedURLException
	{
	String path = mainAttributes == null ?
	null : mainAttributes.getValue("UNO-Type-Path");
	if (path == null) {
	path = "<>";
	}
	for (int i = 0; i < path.length();) {
	while (i < path.length() && path.charAt(i) == ' ') {
	++i;
	}
	if (i < path.length()) {
	String url;
	if (path.charAt(i) == '<') {
	int j = path.indexOf('>', i + 1);
	if (j < 0) {
	url = path.substring(i + 1);
	i = path.length();
	} else {
	url = path.substring(i + 1, j);
	i = j + 1;
	}
	} else {
	int j = path.indexOf(' ', i + 1);
	if (j < 0) {
	j = path.length();
	}
	url = path.substring(i, j);
	i = j;
	}
	addURL(new URL(jar, url));
	}
	}
	return URLClassLoader.newInstance(new URL[] { jar }, this);
	}

	/**
	* Executes a UNO JAR.
	*
	* @param jar the URL of a UNO JAR that specifies a Main-Class; must not be
	* <code>null</code>.
	*
	* @param arguments any arguments passed to the <code>main</code> method of
	* the specified Main-Class of the given JAR <code>jar</code>; must not be
	* <code>null</code>.
	*
	* @throws IOException if there are any problems processing the given JAR
	* <code>jar</code>.
	*
	* @throws ClassNotFoundException if the given JAR <code>jar</code> does not
	* specify a Main-Class, or if the specified Main-Class cannot be found.
	*
	* @throws NoSuchMethodException if the specified Main-Class of the given
	* JAR <code>jar</code> does not have an appropriate <code>main</code>
	* method.
	*
	* @throws InvocationTargetException if an exception occurs while executing
	* the <code>main</code> method of the specified Main-Class of the given JAR
	* <code>jar</code>.
	*/
	public void execute(URL jar, String[] arguments)
	throws IOException, ClassNotFoundException, NoSuchMethodException,
	InvocationTargetException
	{
	Attributes attr = getJarMainAttributes(jar);
	String name = attr == null
	? null : attr.getValue(Attributes.Name.MAIN_CLASS);
	if (name == null) {
	throw new ClassNotFoundException(
	jar + " does not specify a main class");
	}
	try {
	getClassLoader(jar, attr).loadClass(name.replace('/', '.')).
	getMethod("main", new Class[] { String[].class }).
	invoke(null, new Object[] { arguments });
	} catch (IllegalAccessException e) {
	throw new RuntimeException("impossible " + e);
	}
	}

	/**
	* Obtains the main section of the manifest of a JAR.
	*
	* @param jar the URL of a JAR; must not be <code>null</code>.
	*
	* @return the representation of the main section of the manifest of the
	* given JAR <code>jar</code>, or <code>null</code> if the given JAR does
	* not have a manifest.
	*
	* @throws IOException if there are any problems processing the given JAR
	* <code>jar</code>.
	*/
	public static Attributes getJarMainAttributes(URL jar) throws IOException {
	JarInputStream s = new JarInputStream(jar.openStream());
	Manifest mf;
	try {
	mf = s.getManifest();
	} finally {
	s.close();
	}
	return mf == null ? null : mf.getMainAttributes();
	}

	private static URL[] createUrls(URL base, URL[] classPath)
	throws MalformedURLException
	{
	final int JARS = 4;
	URL[] urls = new URL[JARS + (classPath == null ? 0 : classPath.length)];
	urls[0] = new URL(base, "java_uno.jar"); //TODO get rid of it here
	urls[1] = new URL(base, "juh.jar");
	urls[2] = new URL(base, "jurt.jar");
	urls[3] = new URL(base, "ridl.jar");
	if (classPath != null) {
	System.arraycopy(classPath, 0, urls, JARS, classPath.length);
	}
	return urls;
	}
	}