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package org.jmock.internal;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import static java.lang.Thread.currentThread;

public class SearchingClassLoader extends ClassLoader {
    private final ClassLoader nextToSearch;
    public SearchingClassLoader(ClassLoader parent, ClassLoader nextToSearch) {
        this.nextToSearch = nextToSearch;
    public static ClassLoader combine(ClassLoader... parentLoaders) {
        return combine(Arrays.asList(parentLoaders));
    public static ClassLoader combine(List<ClassLoader> parentLoaders) {
        ClassLoader loader = parentLoaders.get(parentLoaders.size()-1);
        for (int i = parentLoaders.size()-2; i >= 0; i--) {
            loader = new SearchingClassLoader(parentLoaders.get(i), loader);
        return loader;
    public static ClassLoader combineLoadersOf(Class<?>... classes) {
        return combineLoadersOf(classes[0], classes);
    public static ClassLoader combineLoadersOf(Class<?> first, Class<?>... others) {
        List<ClassLoader> loaders = new ArrayList<ClassLoader>();
        addIfNewElement(loaders, first.getClassLoader());
        for (Class<?> c : others) {
            addIfNewElement(loaders, c.getClassLoader());
        // To support Eclipse Plug-in tests.
        // In an Eclipse plug-in, jMock itself will not be on the system class loader
        // but in the class loader of the plug-in.
        // Note: I've been unable to reproduce the error in jMock's test suite.
        addIfNewElement(loaders, SearchingClassLoader.class.getClassLoader());
        // To support the Maven Surefire plugin.
        // Note: I've been unable to reproduce the error in jMock's test suite.
        addIfNewElement(loaders, currentThread().getContextClassLoader());
        addIfNewElement(loaders, ClassLoader.getSystemClassLoader());
        return combine(loaders);
    private static void addIfNewElement(List<ClassLoader> loaders, ClassLoader c) {
        if (c != null && !loaders.contains(c)) {
    protected Class<?> findClass(String name) throws ClassNotFoundException {
        if (nextToSearch != null) {
            return nextToSearch.loadClass(name);
        else {
            return super.findClass(name); // will throw ClassNotFoundException

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