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/**
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.sdo.codegen;
import java.util.List;
import commonj.sdo.Property;
import commonj.sdo.Type;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Opcodes;
import org.apache.tuscany.sdo.SDOTypeVisitor;
/**
* Implementation of a generator that will directly emit bytecode for an interface that
* corresponds to the static properties of a SDO type.
*
* @version $Rev$ $Date$
*/
public class BytecodeInterfaceGenerator implements SDOTypeVisitor {
private final ClassWriter cw;
public BytecodeInterfaceGenerator() {
cw = new ClassWriter(false);
}
public void visitType(Type type) {
String name = type.getName();
int lastDot = name.lastIndexOf('.');
if (lastDot != -1) {
name = name.replace('.', '/');
} else {
name = Character.toUpperCase(name.charAt(0)) + name.substring(1);
}
List baseTypes = type.getBaseTypes();
String[] interfaces = new String[baseTypes.size()];
for (int i = 0; i < baseTypes.size(); i++) {
Type baseType = (Type) baseTypes.get(i);
interfaces[i] = baseType.getInstanceClass().getName().replace('.', '/');
}
cw.visit(Opcodes.V1_4,
Opcodes.ACC_PUBLIC + Opcodes.ACC_ABSTRACT + Opcodes.ACC_INTERFACE,
name, null, "java/lang/Object", interfaces);
}
public void visitProperty(Property property) {
String name = property.getName();
String propertyName = Character.toUpperCase(name.charAt(0)) + name.substring(1);
Class javaType = property.getType().getInstanceClass();
String desc = org.objectweb.asm.Type.getDescriptor(javaType);
if (property.isMany()) {
cw.visitMethod(Opcodes.ACC_PUBLIC + Opcodes.ACC_ABSTRACT, "get" + propertyName, "()Ljava/util/List;", null, null).visitEnd();
} else {
if (boolean.class.equals(javaType)) {
cw.visitMethod(Opcodes.ACC_PUBLIC + Opcodes.ACC_ABSTRACT, "is" + propertyName, "()Z", null, null).visitEnd();
} else {
cw.visitMethod(Opcodes.ACC_PUBLIC + Opcodes.ACC_ABSTRACT, "get" + propertyName, "()" + desc, null, null).visitEnd();
}
if (!property.isReadOnly()) {
cw.visitMethod(Opcodes.ACC_PUBLIC + Opcodes.ACC_ABSTRACT, "set" + propertyName, '(' + desc + ")V", null, null).visitEnd();
}
}
}
public void visitEnd() {
cw.visitEnd();
}
/**
* Return the bytecode for the interface class in a form that can be written
* to disk, added to a JAR file, or passed to a ClassLoader.
*
* @return the bytecode for the SDO Type's interface class
*/
public byte[] getClassData() {
return cw.toByteArray();
}
}
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