001// Copyright 2005 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.hivemind.service.impl;
016
017import java.util.HashMap;
018import java.util.Map;
019
020import javassist.CtClass;
021
022/**
023 * Common code for {@link org.apache.hivemind.service.impl.ClassFabImpl} and
024 * {@link org.apache.hivemind.service.impl.InterfaceFabImpl}.
025 * 
026 * @author Howard M. Lewis Ship
027 * @since 1.1
028 */
029public class AbstractFab
030{
031
032    private final CtClass _ctClass;
033
034    private final CtClassSource _source;
035
036    public AbstractFab(CtClassSource source, CtClass ctClass)
037    {
038        _ctClass = ctClass;
039        _source = source;
040    }
041
042    /**
043     * Map from Class to CtClass.
044     * 
045     * @since 1.1
046     */
047    private Map _ctClassCache = new HashMap();
048
049    public void addInterface(Class interfaceClass)
050    {
051        CtClass ctInterfaceClass = _source.getCtClass(interfaceClass);
052
053        _ctClass.addInterface(ctInterfaceClass);
054    }
055
056    protected CtClass[] convertClasses(Class[] inputClasses)
057    {
058        if (inputClasses == null || inputClasses.length == 0)
059            return null;
060
061        int count = inputClasses.length;
062        CtClass[] result = new CtClass[count];
063
064        for (int i = 0; i < count; i++)
065        {
066            CtClass ctClass = convertClass(inputClasses[i]);
067
068            result[i] = ctClass;
069        }
070
071        return result;
072    }
073
074    /**
075     * @since 1.1
076     */
077    protected CtClass convertClass(Class inputClass)
078    {
079        CtClass result = (CtClass) _ctClassCache.get(inputClass);
080
081        if (result == null)
082        {
083            result = _source.getCtClass(inputClass);
084            _ctClassCache.put(inputClass, result);
085        }
086
087        return result;
088    }
089
090    public Class createClass()
091    {
092        return _source.createClass(_ctClass);
093    }
094
095    protected CtClass getCtClass()
096    {
097        return _ctClass;
098    }
099
100    protected CtClassSource getSource()
101    {
102        return _source;
103    }
104
105}