108 lines
4.3 KiB
Java
108 lines
4.3 KiB
Java
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/*
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* Janino - An embedded Java[TM] compiler
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*
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* Copyright (c) 2001-2010, Arno Unkrig
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
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* following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
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* following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
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* following disclaimer in the documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.codehaus.janino.util;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import org.codehaus.janino.JaninoRuntimeException;
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import org.codehaus.janino.util.resource.Resource;
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import org.codehaus.janino.util.resource.ResourceFinder;
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/**
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* A {@link ClassLoader} that uses a {@link org.codehaus.janino.util.resource.ResourceFinder} to find ".class" files.
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*/
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@SuppressWarnings({ "rawtypes", "unchecked" }) public
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class ResourceFinderClassLoader extends ClassLoader {
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private final ResourceFinder resourceFinder;
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public
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ResourceFinderClassLoader(ResourceFinder resourceFinder, ClassLoader parent) {
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super(parent);
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this.resourceFinder = resourceFinder;
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}
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/** @return The underlying {@link ResourceFinder} */
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public ResourceFinder
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getResourceFinder() { return this.resourceFinder; }
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@Override protected Class
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findClass(String className) throws ClassNotFoundException {
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// Find the resource containing the class bytecode.
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Resource classFileResource = this.resourceFinder.findResource(ClassFile.getClassFileResourceName(className));
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if (classFileResource == null) throw new ClassNotFoundException(className);
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// Open the class file resource.
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InputStream is;
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try {
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is = classFileResource.open();
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} catch (IOException ex) {
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throw new JaninoRuntimeException((
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"Opening class file resource \""
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+ classFileResource.getFileName()
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+ "\": "
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+ ex.getMessage()
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), ex);
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}
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// Read bytecode from the resource into a byte array.
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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try {
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byte[] buffer = new byte[4096];
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for (;;) {
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int bytesRead = is.read(buffer);
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if (bytesRead == -1) break;
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baos.write(buffer, 0, bytesRead);
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}
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} catch (IOException ex) {
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throw new ClassNotFoundException("Reading class file from \"" + classFileResource + "\"", ex);
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} finally {
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try { is.close(); } catch (IOException ex) {}
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}
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byte[] ba = baos.toByteArray();
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// Define the class in this ClassLoader.
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Class clazz = super.defineClass(null, ba, 0, ba.length);
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if (!clazz.getName().equals(className)) {
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// This is a really complicated case: We may find a class file on
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// the class path that seemingly defines the class we are looking
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// for, but doesn't. This is possible if the underlying file system
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// has case-insensitive file names and/or file names that are
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// limited in length (e.g. DOS 8.3).
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throw new ClassNotFoundException(className);
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}
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return clazz;
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}
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}
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