org.aspectj/bcel-builder/testsrc/org/aspectj/apache/bcel/classfile/tests/AnnotationGenTest.java

/*******************************************************************************
 * Copyright (c) 2004 IBM All rights reserved. This program and the accompanying
 * materials are made available under the terms of the Common Public License
 * v1.0 which accompanies this distribution and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors: Andy Clement - initial implementation
 ******************************************************************************/

package org.aspectj.apache.bcel.classfile.tests;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.aspectj.apache.bcel.Constants;
import org.aspectj.apache.bcel.generic.ClassGen;
import org.aspectj.apache.bcel.generic.ConstantPoolGen;
import org.aspectj.apache.bcel.generic.ObjectType;
import org.aspectj.apache.bcel.generic.annotation.AnnotationGen;
import org.aspectj.apache.bcel.generic.annotation.ElementNameValuePairGen;
import org.aspectj.apache.bcel.generic.annotation.ElementValueGen;
import org.aspectj.apache.bcel.generic.annotation.SimpleElementValueGen;

public class AnnotationGenTest extends BcelTestCase {

	protected void setUp() throws Exception {
		super.setUp();
	}

	private ClassGen createClassGen(String classname) {
		return new ClassGen(classname, "java.lang.Object",
				"<generated>", Constants.ACC_PUBLIC | Constants.ACC_SUPER, null);
	}

	/**
	 * Programmatically construct an mutable annotation (AnnotationGen) object.
	 */
	public void testConstructMutableAnnotation() {
		
		// Create the containing class
		ClassGen cg = createClassGen("HelloWorld");
		ConstantPoolGen cp = cg.getConstantPool();
		
		// Create the simple primitive value '4' of type 'int'
		SimpleElementValueGen evg = 
			new SimpleElementValueGen(ElementValueGen.PRIMITIVE_INT,cp,4);
		
		// Give it a name, call it 'id'
		ElementNameValuePairGen nvGen = new ElementNameValuePairGen("id",evg,cp);
		
		// Check it looks right 
		assertTrue("Should include string 'id=4' but says: "+nvGen.toString(),
			nvGen.toString().indexOf("id=4")!=-1);
		
		
		ObjectType t = new ObjectType("SimpleAnnotation");
		
		List elements = new ArrayList();
		elements.add(nvGen);
		
		// Build an annotation of type 'SimpleAnnotation' with 'id=4' as the only value :)
		AnnotationGen a = new AnnotationGen(t,elements,true,cp);
		
		// Check we can save and load it ok
		checkSerialize(a,cp);
	}
	
	////
	// Helper methods
	
	private void checkSerialize(AnnotationGen a,ConstantPoolGen cpg) {
		try {
		  String beforeName = a.getTypeName();
		  List beforeValues = a.getValues();
		  ByteArrayOutputStream baos = new ByteArrayOutputStream();
		  DataOutputStream dos = new DataOutputStream(baos);
		  a.dump(dos);
		  dos.flush();
		  dos.close();
		  
		  byte[] bs = baos.toByteArray();
		  
		  ByteArrayInputStream bais = new ByteArrayInputStream(bs);
		  DataInputStream dis = new DataInputStream(bais);
		  AnnotationGen annAfter = AnnotationGen.read(dis,cpg,a.isRuntimeVisible());
		  
		  dis.close();
		  
		  String afterName = annAfter.getTypeName();
		  List afterValues = annAfter.getValues();
		  
		  if (!beforeName.equals(afterName)) {
		  	fail("Deserialization failed: before type='"+beforeName+"' after type='"+afterName+"'");
		  }
		  if (a.getValues().size()!=annAfter.getValues().size()) {
		  	fail("Different numbers of element name value pairs?? "+a.getValues().size()+"!="+annAfter.getValues().size());
		  }
		  for (int i=0;i<a.getValues().size();i++) {
			ElementNameValuePairGen beforeElement = (ElementNameValuePairGen) a.getValues().get(i);
			ElementNameValuePairGen afterElement = (ElementNameValuePairGen) annAfter.getValues().get(i);
			if (!beforeElement.getNameString().equals(afterElement.getNameString())) {
				fail("Different names?? "+beforeElement.getNameString()+"!="+afterElement.getNameString());
			}
		  }
		 
		  
		} catch (IOException ioe) {
			fail("Unexpected exception whilst checking serialization: "+ioe);
		}
	}
	

	protected void tearDown() throws Exception {
		super.tearDown();
	}

}