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81 lines
3.0 KiB
81 lines
3.0 KiB
// serverClassLoader.java
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// -----------------------
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2004
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// last major change: 11.07.2004
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.server;
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import java.io.File;
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import java.io.IOException;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import net.yacy.kelondro.util.FileUtils;
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public final class serverClassLoader extends ClassLoader {
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/**
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* directory of class files
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*/
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private final Map<File, Class<?>> classes;
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public serverClassLoader() {
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//super(ClassLoader.getSystemClassLoader());
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super(Thread.currentThread().getContextClassLoader());
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this.classes = new ConcurrentHashMap<File, Class<?>>(100);
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}
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public serverClassLoader(final ClassLoader parent) {
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super(parent);
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classes = new ConcurrentHashMap<File, Class<?>>(100);
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}
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public Package[] packages() {
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return super.getPackages();
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}
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public Class<?> loadClass(final File classfile) throws ClassNotFoundException {
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// take the class out of the cache, denoted by the class file
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Class<?> c = this.classes.get(classfile);
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if (c != null) return c;
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final int p = classfile.getName().indexOf(".");
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if (p < 0) throw new ClassNotFoundException("wrong class name: " + classfile.getName());
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final String classname = classfile.getName().substring(0, p);
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// load the file from the file system
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byte[] b;
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try {
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//System.out.println("*** DEBUG CLASSLOADER: " + classfile + "; file " + (classfile.exists() ? "exists": "does not exist"));
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b = FileUtils.read(classfile);
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// make a class out of the stream
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c = this.defineClass(null, b, 0, b.length);
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resolveClass(c);
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this.classes.put(classfile, c);
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} catch (final LinkageError ee) {
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c = findLoadedClass(classname);
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if (c != null) return c;
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throw new ClassNotFoundException("linkageError, " + ee.getMessage() + ":" + classfile.toString());
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} catch (final IOException ee) {
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throw new ClassNotFoundException(ee.getMessage() + ":" + classfile.toString());
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}
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return c;
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}
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} |