testjarclassloader.java

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package com.opensymphony.tonic.loaders.classloading;

import com.opensymphony.tonic.mock.MockBear;

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;

public class TestJarClassLoader extends AbstractTestClassLoader
{
    /**
     * Here we try to load a specific JAR (paddington-test-tonic.jar) and get the descriptor out of it.
     */
    public void testLoader() throws IOException, ClassNotFoundException, IllegalAccessException, InstantiationException
    {
        // hacky way of getting to the paddington-test-tonic.jar (assume it's two levels below src/test/etc/test-disabled-tonic.xml)
        File pluginsDirectory = getPluginsDirectory();
        File pluginJar = new File(pluginsDirectory, "paddington-test-plugin.jar");

        // make the JAR loader
        JarClassLoader loader = new JarClassLoader(pluginJar, this.getClass().getClassLoader());

        // now make sure we only got one descriptor back
        Enumeration descriptors = loader.findResources("tonic-plugin.xml");
        assertTrue(descriptors.hasMoreElements());
        URL descriptor = (URL) descriptors.nextElement();
        assertTrue(descriptor.toExternalForm().endsWith("paddington-test-plugin.jar!tonic-plugin.xml"));
        assertFalse(descriptors.hasMoreElements());

        // now try to load the tonic class and cast it to something in the global class path
        Class paddingtonClass = loader.findClass("com.opensymphony.tonic.mock.MockPaddington");
        MockBear paddington = (MockBear) paddingtonClass.newInstance();

        // check we really did get the right class
        assertEquals("com.opensymphony.tonic.mock.MockPaddington", paddington.getClass().getName());
    }
}