package com.esotericsoftware.reflectasm;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import junit.framework.TestCase;

public class ClassLoaderTest extends TestCase {
	public void testDifferentClassloaders () throws Exception {
		// This classloader can see only the Test class and core Java classes.
		ClassLoader testClassLoader = new ClassLoader() {
			protected synchronized Class<?> loadClass (String name, boolean resolve) throws ClassNotFoundException {
				Class c = findLoadedClass(name);
				if (c != null) return c;
				if (name.startsWith("java.")) return super.loadClass(name, resolve);
				if (!name.equals("com.esotericsoftware.reflectasm.ClassLoaderTest$Test"))
					throw new ClassNotFoundException("Class not found on purpose: " + name);
				ByteArrayOutputStream output = new ByteArrayOutputStream(32 * 1024);
				InputStream input = ClassLoaderTest.class.getResourceAsStream("/" + name.replace('.', '/') + ".class");
				if (input == null) return null;
				try {
					byte[] buffer = new byte[4096];
					int total = 0;
					while (true) {
						int length = input.read(buffer, 0, buffer.length);
						if (length == -1) break;
						output.write(buffer, 0, length);
					}
				} catch (IOException ex) {
					throw new ClassNotFoundException("Error reading class file.", ex);
				} finally {
					try {
						input.close();
					} catch (IOException ignored) {
					}
				}
				byte[] buffer = output.toByteArray();
				return defineClass(name, buffer, 0, buffer.length);
			}
		};
		Class testClass = testClassLoader.loadClass("com.esotericsoftware.reflectasm.ClassLoaderTest$Test");
		Object testObject = testClass.newInstance();

		// Ensure AccessClassLoader can access both the Test class and FieldAccess.
		FieldAccess access = FieldAccess.get(testObject.getClass());
		access.set(testObject, "name", "first");
		assertEquals("first", testObject.toString());
		assertEquals("first", access.get(testObject, "name"));
	}

	static public class Test {
		public String name;

		public String toString () {
			return name;
		}
	}
}