hammant 02/01/04 05:17:31
Added: armi/src/java/org/apache/commons/armi/server/impl
BCELClassRetriever.java
Log:
Start of BCEL proxy
Revision Changes Path
1.1
jakarta-commons-sandbox/armi/src/java/org/apache/commons/armi/server/impl/BCELClassRetriever.java
Index: BCELClassRetriever.java
===================================================================
/*
* $Header:
/home/cvs/jakarta-commons-sandbox/armi/src/java/org/apache/commons/armi/server/impl/BCELClassRetriever.java,v
1.1 2002/01/04 13:17:31 hammant Exp $
* $Revision: 1.1 $
* $Date: 2002/01/04 13:17:31 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.commons.armi.server.impl;
import org.apache.commons.armi.server.ArmiClassRetrievalException;
import org.apache.commons.armi.server.ClassRetriever;
import org.apache.commons.armi.common.AbstractMethodHandler;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.Constants;
import org.apache.bcel.generic.ClassGen;
import org.apache.bcel.generic.InstructionList;
import org.apache.bcel.generic.ConstantPoolGen;
import java.net.URLClassLoader;
import java.net.URL;
import java.net.MalformedURLException;
import java.io.File;
import java.io.InputStream;
import java.io.ByteArrayInputStream;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Vector;
import java.lang.reflect.Method;
/**
* Class BCELClassRetriever
*
*
* @author Paul Hammant <a
href="mailto:[EMAIL PROTECTED]";>[EMAIL PROTECTED]</a>
* @version $Revision: 1.1 $
*/
public class BCELClassRetriever extends AbstractMethodHandler implements
ClassRetriever {
private HashMap mClasses = new HashMap();
PrintWriter mClassSource = null; // TODO delete this from source when completed
public void generate(String asName, Class[] interfacesToPublish) {
String[] interfaces = new String[interfacesToPublish.length];
for (int i = 0; i < interfacesToPublish.length; i++) {
interfaces[i] = interfacesToPublish[i].getClass().getName();
}
ClassGen cg = new ClassGen("ArmiGenerated" + asName,
"org.apache.commons.armi.client.impl.BaseServedObject",
"<generated>", Constants.ACC_PUBLIC |
Constants.ACC_SUPER,
interfaces);
ConstantPoolGen cp = cg.getConstantPool(); // cg creates constant pool
InstructionList il = new InstructionList();
cg.addEmptyConstructor(Constants.ACC_PUBLIC);
Vector methodsDone = new Vector();
for (int x = 0; x < interfacesToPublish.length; x++) {
Method[] methods = interfacesToPublish[x].getMethods();
for (int i = 0; i < methods.length; i++) {
Method method = methods[i];
String methodSignature = super.getMethodSignature(method);
if (!methodsDone.contains(methodSignature)) {
methodsDone.add(methodSignature);
generate(methodSignature, asName, cg, cp, il, method);
}
}
}
mClasses.put(asName, cg.getJavaClass().getBytes());
}
// Much of the following taken from PrimarySourceGenerator.
// Lots to convert before this will work.
private void generate(String methodSignature, String asName, ClassGen cg,
ConstantPoolGen cpg, InstructionList il, Method method) {
String rClass = method.getReturnType().getName();
String mName = method.getName();
mClassSource.print(" public " + rClass + " " + mName + " (");
Class[] argTypes = method.getParameterTypes();
for (int i = 0; i < argTypes.length; i++) {
String cn = argTypes[i].getName();
generateParameter(cn, argTypes, i);
}
mClassSource.print(") ");
Class[] throwsTypes = method.getExceptionTypes();
for (int i = 0; i < throwsTypes.length; i++) {
generateThrows(i, throwsTypes);
}
mClassSource.println("{");
mClassSource.println(" Object[] args = new Object[" +
argTypes.length
+ "];");
for (int i = 0; i < argTypes.length; i++) {
String cn = argTypes[i].getName();
generateAssignLine(cn, i);
}
mClassSource.println(" try {");
if (rClass.equals("void")) {
mClassSource.println(" armiProcessVoidRequest(\""
+ methodSignature.toString() +
"\",args);");
} else {
mClassSource.println(" Object retVal =
armiProcessObjectRequest(\""
+ methodSignature.toString() +
"\",args);");
generateReturnLine(rClass);
}
mClassSource.println(" } catch (Throwable t) {");
throwsTypes = method.getExceptionTypes();
for (int i = 0; i < throwsTypes.length; i++) {
generateThrowHandler(i, throwsTypes);
}
mClassSource.println(" if (t instanceof RuntimeException) {
");
mClassSource.println(" throw (RuntimeException) t;");
mClassSource.println(" } else if (t instanceof Error) { ");
mClassSource.println(" throw (Error) t;");
mClassSource.println(" } else { ");
mClassSource.println(
" throw new
org.apache.commons.armi.common.ArmiInvocationException(\"Should never get here\" +
t.getMessage()); ");
mClassSource.println(" }");
mClassSource.println(" }");
mClassSource.println(" }");
}
private void generateParameter(String cn, Class[] argTypes, int i) {
if (cn.startsWith("L")) {
mClassSource.print(argTypes[i].getName());
} else if (cn.startsWith("[L")) {
mClassSource.print(argTypes[i].getName() + "[]");
} else if (cn.equals("[B")) {
mClassSource.print("byte[]");
} else if (cn.equals("[C")) {
mClassSource.print("char[]");
} else if (cn.equals("[D")) {
mClassSource.print("double[]");
} else if (cn.equals("[F")) {
mClassSource.print("float[]");
} else if (cn.equals("[I")) {
mClassSource.print("int[]");
} else if (cn.equals("[J")) {
mClassSource.print("long[]");
} else if (cn.equals("[S")) {
mClassSource.print("short[]");
} else if (cn.equals("[Z")) {
mClassSource.print("boolean[]");
} else {
mClassSource.print(cn);
}
mClassSource.print(" v" + i);
if (i + 1 < argTypes.length) {
mClassSource.print(", ");
}
}
private void generateAssignLine(String cn, int i) {
if (cn.equals("int")) {
mClassSource.println(" args[" + i + "] = new Integer(v" + i + ");");
} else if (cn.equals("short")) {
mClassSource.println(" args[" + i + "] = new Short(v" + i + ");");
} else if (cn.equals("float")) {
mClassSource.println(" args[" + i + "] = new Float(v" + i + ");");
} else if (cn.equals("double")) {
mClassSource.println(" args[" + i + "] = new Double(v" + i + ");");
} else if (cn.equals("long")) {
mClassSource.println(" args[" + i + "] = new Long(v" + i + ");");
} else if (cn.equals("char")) {
mClassSource.println(" args[" + i + "] = new Character(v" + i + ");");
} else if (cn.equals("boolean")) {
mClassSource.println(" args[" + i + "] = new Boolean(v" + i + ");");
} else if (cn.equals("byte")) {
mClassSource.println(" args[" + i + "] = new Byte(v" + i + ");");
} else {
mClassSource.println(" args[" + i + "] = v" + i + ";");
}
}
private void generateReturnLine(String rClass) {
if (rClass.equals("boolean")) {
mClassSource.println(" return ((Boolean) retVal).booleanValue();");
} else if (rClass.equals("integer")) {
mClassSource.println(" return ((Integer) retVal).intValue();");
} else if (rClass.equals("short")) {
mClassSource.println(" return ((Short) retVal).shortValue();");
} else if (rClass.equals("float")) {
mClassSource.println(" return ((Float) retVal).floatValue();");
} else if (rClass.equals("double")) {
mClassSource.println(" return ((Double) retVal).doubleValue();");
} else if (rClass.equals("long")) {
mClassSource.println(" return ((Long) retVal).longValue();");
} else if (rClass.equals("char")) {
mClassSource.println(" return ((Character) retVal).charValue();");
} else if (rClass.equals("byte")) {
mClassSource.println(" return ((Byte) retVal).byteValue();");
} else {
mClassSource.println(" return (" + rClass + ") retVal;");
}
}
private void generateThrowHandler(int i, Class[] throwsTypes) {
if (i == 0) {
mClassSource.println(" if (t instanceof " +
throwsTypes[i].getName() + ") { ");
} else {
mClassSource.println(" } else if (t instanceof " +
throwsTypes[i].getName()
+ ") { ");
}
mClassSource.println(" throw (" + throwsTypes[i].getName() + ") t;");
if (i + 1 == throwsTypes.length) {
mClassSource.print(" } else");
}
}
private void generateThrows(int i, Class[] throwsTypes) {
if (i == 0) {
mClassSource.print("throws ");
}
mClassSource.print(throwsTypes[i].getName());
if (i + 1 < throwsTypes.length) {
mClassSource.print(", ");
}
}
/**
* Method getBytes
*
*
* @param publishedName
*
* @return
*
* @throws ArmiClassRetrievalException
*
*/
public byte[] getBytes(String publishedName) throws ArmiClassRetrievalException {
byte[] bytes = (byte[]) mClasses.get(publishedName);
if (bytes == null) {
throw new ArmiClassRetrievalException("Generated class not found in BCEL
respoisitory on server");
}
return bytes;
}
}
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