diff options
Diffstat (limited to 'bundles/org.eclipse.jst.jsp.core/src/org/eclipse/jst/jsp/core/internal/taglib/TaglibClassLoader.java')
| -rw-r--r-- | bundles/org.eclipse.jst.jsp.core/src/org/eclipse/jst/jsp/core/internal/taglib/TaglibClassLoader.java | 350 |
1 files changed, 0 insertions, 350 deletions
diff --git a/bundles/org.eclipse.jst.jsp.core/src/org/eclipse/jst/jsp/core/internal/taglib/TaglibClassLoader.java b/bundles/org.eclipse.jst.jsp.core/src/org/eclipse/jst/jsp/core/internal/taglib/TaglibClassLoader.java deleted file mode 100644 index 2df3104517..0000000000 --- a/bundles/org.eclipse.jst.jsp.core/src/org/eclipse/jst/jsp/core/internal/taglib/TaglibClassLoader.java +++ /dev/null @@ -1,350 +0,0 @@ -package org.eclipse.jst.jsp.core.internal.taglib; - - -import java.io.ByteArrayOutputStream; -import java.io.File; -import java.io.FileInputStream; -import java.io.IOException; -import java.io.InputStream; -import java.util.ArrayList; -import java.util.Iterator; -import java.util.List; -import java.util.jar.JarEntry; -import java.util.jar.JarFile; - -import org.eclipse.core.runtime.Platform; -import org.eclipse.jst.jsp.core.internal.Logger; - - - -/** - * Custom classloader which allows you to add source directories (folders - * containing .class files) and jars to the classpath. - * - * @author pavery - */ -public class TaglibClassLoader extends ClassLoader { - - // for debugging - private static final boolean DEBUG; - static { - String value = Platform.getDebugOption("org.eclipse.jst.jsp.core/debug/taglibclassloader"); //$NON-NLS-1$ - DEBUG = value != null && value.equalsIgnoreCase("true"); //$NON-NLS-1$ - } - - private List jarsList = new ArrayList(); - private List dirsList = new ArrayList(); - private List usedJars = new ArrayList(); - private List usedDirs = new ArrayList(); - - private List failedClasses = new ArrayList(); // CL: added to optimize - // failed loading - - // private List loadedClassFilenames = new ArrayList(); - - public TaglibClassLoader(ClassLoader parentLoader) { - super(parentLoader); - } - - /** - * Adds a new jar to classpath. - * - * @param filename - - * full path to the jar file - */ - public void addJar(String filename) { - if (DEBUG) - System.out.println("trying to add: [" + filename + "] to classpath"); //$NON-NLS-1$ //$NON-NLS-2$ - // don't add the same entry twice, or search times will get even worse - if (!jarsList.contains(filename)) { - jarsList.add(filename); - failedClasses = new ArrayList(); - if (DEBUG) - System.out.println(" + [" + filename + "] added to classpath"); //$NON-NLS-1$ //$NON-NLS-2$ - } - } - - /** - * Removes a jar from the classpath. - * - * @param filename - - * full path to the jar file - */ - public void removeJar(String filename) { - jarsList.remove(filename); - failedClasses = new ArrayList(); - if (DEBUG) - System.out.println("removed: [" + filename + "] from classpath"); //$NON-NLS-1$ //$NON-NLS-2$ - } - - public void addDirectory(String dirPath) { - if (!dirsList.contains(dirPath)) { - dirsList.add(dirPath); - failedClasses = new ArrayList(); - if (DEBUG) - System.out.println("added: [" + dirPath + "] to classpath"); //$NON-NLS-1$ //$NON-NLS-2$ - } - } - - /** - * Removes a directory from the classpath. - * - * @param dirPath - - * full path of the directory - */ - public void removeDirectory(String dirPath) { - dirsList.remove(dirPath); - failedClasses = new ArrayList(); - if (DEBUG) - System.out.println("removed: [" + dirPath + "] from classpath"); //$NON-NLS-1$ //$NON-NLS-2$ - } - - /** - * Returns the list of JARs on this loader's classpath that contain - * classes that have been loaded. - * - * @return List - the list of JARs - */ - public List getJarsInUse() { - return usedJars; - } - - /** - * Returns a list of directories on this loader's classpath that contain - * classes that have been loaded. - * - * @return List - the list of directories (fully-qualified filename - * Strings) - */ - public List getDirectoriesInUse() { - return usedDirs; - } - - /** - * Returns a list of filenames for loose classes that have been loaded out - * of directories. - * - * @return List - the list of class filenames - */ - // public List getClassFilenamesFromDirectories() { - // return loadedClassFilenames; - // } - /** - * Searches for the given class name on the defined classpath - - * directories are checked before JARs. - * - * @param className - - * the name of the class to find - * @return Class - the loaded class - * @throws ClassNotFoundException - */ - protected synchronized Class findClass(String className) throws ClassNotFoundException { - Class oldClass = findLoadedClass(className); - if (oldClass != null) { - if (DEBUG) - System.out.println(">> TaglibClassLoader " + this + " returning existing class: " + className); //$NON-NLS-1$ //$NON-NLS-2$ - return oldClass; - } - if (failedClasses.contains(className)) { - if (DEBUG) - System.out.println(">> TaglibClassLoader " + this + " known missing class: " + className); //$NON-NLS-1$ //$NON-NLS-2$ - throw new ClassNotFoundException(); - } - - if (DEBUG) - System.out.println(">> TaglibClassLoader " + this + " finding class: " + className); //$NON-NLS-1$ //$NON-NLS-2$ - - Class newClass = null; - JarFile jarfile = null; - JarEntry entry = null; - - // get the correct name of the actual .class file to search for - String fileName = calculateClassFilename(className); - InputStream stream = null; - try { - // first try searching the classpath directories - Iterator dirs = dirsList.iterator(); - File f; - String dirName; - String fileToFind = ""; //$NON-NLS-1$ - while (dirs.hasNext()) { - dirName = (String) dirs.next(); - fileToFind = dirName + "/" + fileName; //$NON-NLS-1$ - - f = new File(fileToFind); - if (f.exists()) { - stream = new FileInputStream(f); - usedDirs.add(dirName); - // loadedClassFilenames.add(fileToFind); - if (DEBUG) - System.out.println(">> added file from dir: " + dirName + "/" + fileName); //$NON-NLS-1$ //$NON-NLS-2$ - break; - - } - } - - if (stream != null) { - // found a class from a directory - ByteArrayOutputStream byteStream = new ByteArrayOutputStream(); - while (stream.available() > 0) { - byteStream.write(stream.read()); - } - - byte[] byteArray = byteStream.toByteArray(); - try { - if (DEBUG) - System.out.println(">> defining newClass:" + className); //$NON-NLS-1$ - newClass = defineClass(className, byteArray, 0, byteArray.length); - resolveClass(newClass); - } - catch (Throwable t) { - - // j9 can give ClassCircularityError - // parent should already have the class then - // try parent loader - try { - Class c = getParent().loadClass(className); - if (DEBUG) - System.out.println(">> loaded: " + className + " with: " + getParent()); //$NON-NLS-1$ //$NON-NLS-2$ - return c; - } - catch (ClassNotFoundException cnf) { - if (DEBUG) - cnf.printStackTrace(); - } - } - stream.close(); - } - - if (stream == null) { - // still haven't found the class, so now try searching the - // jars - // search each of the jars until we find an entry matching the - // classname - Iterator jars = jarsList.iterator(); - String jarName; - while (jars.hasNext()) { - jarName = (String) jars.next(); - - // make sure the file exists or "new JarFile()" will throw - // an exception - f = new File(jarName); - if (!f.exists()) { - continue; - } - try { - jarfile = new JarFile(jarName); - } - catch (IOException e) { - if (DEBUG) - Logger.logException("bad jar file", e); //$NON-NLS-1$ - } - if (jarfile == null) { - continue; - } - - entry = jarfile.getJarEntry(fileName); - - if (DEBUG) - System.out.println("looking for filename: " + fileName + " in: " + jarfile.getName()); //$NON-NLS-1$ //$NON-NLS-2$ - if (entry != null) { - if (DEBUG) - System.out.println("found the entry: " + entry + " for filename: " + fileName); //$NON-NLS-1$ //$NON-NLS-2$ - // found the class - if (!usedJars.contains(jarName)) { - // add the jar to the list of in-use jars - usedJars.add(jarName); - } - break; - } - jarfile.close(); - } - - if (entry != null) { - // we've found an entry for the desired class - stream = jarfile.getInputStream(entry); - ByteArrayOutputStream byteStream = new ByteArrayOutputStream(); - long byteLength = entry.getSize(); - long totalBytesRead = 0; - int bytesRead; - byte[] byteBuffer = new byte[10000]; - while (totalBytesRead < byteLength) { - bytesRead = stream.read(byteBuffer); - if (bytesRead == -1) { - break; - } - totalBytesRead = totalBytesRead + bytesRead; - byteStream.write(byteBuffer, 0, bytesRead); - } - - byte[] byteArray = byteStream.toByteArray(); - try { - if (DEBUG) - System.out.println(">> defining newClass:" + className); //$NON-NLS-1$ - // define the class from the byte array - newClass = defineClass(className, byteArray, 0, byteArray.length); - resolveClass(newClass); - } - catch (Throwable t) { - // j9 can give ClassCircularityError - // parent should already have the class then - - // try parent - try { - Class c = getParent().loadClass(className); - if (DEBUG) - System.out.println(">> loaded: " + className + " with: " + getParent()); //$NON-NLS-1$ //$NON-NLS-2$ - return c; - } - catch (ClassNotFoundException cnf) { - if (DEBUG) - cnf.printStackTrace(); - } - } - stream.close(); - jarfile.close(); - } - } - } - catch (Throwable t) { - failedClasses.add(className); - return null; - } - finally { - try { - if (stream != null) { - stream.close(); - } - if (jarfile != null) { - jarfile.close(); - } - } - catch (IOException ioe) { - // ioe.printStackTrace(); - // just trying to close down anyway - ignore - } - } - - if (newClass != null) { - if (DEBUG) - System.out.println(">> loaded: " + newClass + " with: " + this); //$NON-NLS-1$ //$NON-NLS-2$ - return newClass; - } - - failedClasses.add(className); - throw new ClassNotFoundException(); - } - - /** - * Replaces '.' in the classname with '/' and appends '.class' if needed. - * - * @return String - the properly-formed class name - */ - private String calculateClassFilename(String name) { - StringBuffer buffer = new StringBuffer(name.replace('.', '/')); - if (!name.endsWith(".class")) { //$NON-NLS-1$ - buffer.append(".class"); //$NON-NLS-1$ - } - return buffer.toString(); - } -}
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