// Copyright 2005 The Apache Software Foundation
//
// Licensed 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.hivemind.service.impl;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import org.apache.hivemind.service.ClassFabUtils;
import org.apache.hivemind.service.ClassFactory;
import org.apache.hivemind.service.InterfaceFab;
import org.apache.hivemind.service.InterfaceSynthesizer;
import org.apache.hivemind.service.MethodSignature;
/**
* @author Howard M. Lewis Ship
*/
public class InterfaceSynthesizerImpl implements InterfaceSynthesizer
{
private ClassFactory _classFactory;
private static class Operation
{
private Set _interfaces = new HashSet();
private Set _interfaceMethods = new HashSet();
private Set _allMethods = new HashSet();
private List _interfaceQueue = new ArrayList();
public Set getInterfaces()
{
return _interfaces;
}
public Set getNonInterfaceMethodSignatures()
{
Set result = new HashSet(_allMethods);
result.removeAll(_interfaceMethods);
return result;
}
public void processInterfaceQueue()
{
while (!_interfaceQueue.isEmpty())
{
Class interfaceClass = (Class) _interfaceQueue.remove(0);
processInterface(interfaceClass);
}
}
private void processInterface(Class interfaceClass)
{
Class[] interfaces = interfaceClass.getInterfaces();
for (int i = 0; i < interfaces.length; i++)
addInterfaceToQueue(interfaces[i]);
Method[] methods = interfaceClass.getDeclaredMethods();
for (int i = 0; i < methods.length; i++)
{
MethodSignature sig = new MethodSignature(methods[i]);
_interfaceMethods.add(sig);
}
}
private void addInterfaceToQueue(Class interfaceClass)
{
if (_interfaces.contains(interfaceClass))
return;
_interfaces.add(interfaceClass);
_interfaceQueue.add(interfaceClass);
}
public void processClass(Class beanClass)
{
Class[] interfaces = beanClass.getInterfaces();
for (int i = 0; i < interfaces.length; i++)
addInterfaceToQueue(interfaces[i]);
Method[] methods = beanClass.getDeclaredMethods();
for (int i = 0; i < methods.length; i++)
{
Method m = methods[i];
int modifiers = m.getModifiers();
if (Modifier.isStatic(modifiers) || !Modifier.isPublic(modifiers))
continue;
MethodSignature sig = new MethodSignature(m);
_allMethods.add(sig);
}
}
}
public Class synthesizeInterface(Class beanClass)
{
Operation op = new Operation();
explodeClass(beanClass, op);
return createInterface(beanClass, op);
}
void explodeClass(Class beanClass, Operation op)
{
Class current = beanClass;
while (current != Object.class)
{
op.processClass(current);
current = current.getSuperclass();
}
op.processInterfaceQueue();
}
Class createInterface(Class beanClass, Operation op)
{
String name = ClassFabUtils.generateClassName(beanClass);
return createInterface(name, op);
}
private Class createInterface(String name, Operation op)
{
InterfaceFab fab = _classFactory.newInterface(name);
Iterator i = op.getInterfaces().iterator();
while (i.hasNext())
{
Class interfaceClass = (Class) i.next();
fab.addInterface(interfaceClass);
}
i = op.getNonInterfaceMethodSignatures().iterator();
while (i.hasNext())
{
MethodSignature sig = (MethodSignature) i.next();
fab.addMethod(sig);
}
return fab.createInterface();
}
public void setClassFactory(ClassFactory classFactory)
{
_classFactory = classFactory;
}
}