76 lines
2.2 KiB
Java
76 lines
2.2 KiB
Java
// Copyright (C) 2016 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package com.google.gerrit.server.plugins;
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import com.google.common.io.ByteStreams;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.URL;
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import java.util.Enumeration;
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public class DelegatingClassLoader extends ClassLoader {
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private final ClassLoader target;
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public DelegatingClassLoader(ClassLoader parent, ClassLoader target) {
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super(parent);
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this.target = target;
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}
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@Override
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public Class<?> findClass(String name) throws ClassNotFoundException {
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String path = name.replace('.', '/') + ".class";
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try (InputStream resource = target.getResourceAsStream(path)) {
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if (resource != null) {
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try {
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byte[] bytes = ByteStreams.toByteArray(resource);
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return defineClass(name, bytes, 0, bytes.length);
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} catch (IOException e) {
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// throws ClassNotFoundException later
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}
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}
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} catch (IOException e) {
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// throws ClassNotFoundException later
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}
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throw new ClassNotFoundException(name);
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}
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@Override
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public URL getResource(String name) {
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URL rtn = getParent().getResource(name);
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if (rtn == null) {
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rtn = target.getResource(name);
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}
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return rtn;
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}
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@Override
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public Enumeration<URL> getResources(String name) throws IOException {
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Enumeration<URL> rtn = getParent().getResources(name);
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if (rtn == null) {
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rtn = target.getResources(name);
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}
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return rtn;
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}
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@Override
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public InputStream getResourceAsStream(String name) {
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InputStream rtn = getParent().getResourceAsStream(name);
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if (rtn == null) {
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rtn = target.getResourceAsStream(name);
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}
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return rtn;
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}
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}
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