001    // Copyright 2004, 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    package org.apache.tapestry.enhance;
015    
016    import java.lang.reflect.Modifier;
017    import java.util.ArrayList;
018    import java.util.Iterator;
019    import java.util.List;
020    
021    import javassist.CtClass;
022    import javassist.CtMethod;
023    
024    import org.apache.hivemind.ApplicationRuntimeException;
025    import org.apache.hivemind.service.InterfaceFab;
026    import org.apache.hivemind.service.MethodSignature;
027    
028    /**
029     * @author Howard M. Lewis Ship
030     */
031    public class InterfaceFabImpl extends AbstractFab implements InterfaceFab
032    {
033        private List _methods = new ArrayList();
034    
035        public InterfaceFabImpl(CtClassSource source, CtClass ctClass)
036        {
037            super(source, ctClass);
038        }
039    
040        public String toString()
041        {
042            StringBuffer buffer = new StringBuffer("InterfaceFabImpl[\npublic interface ");
043    
044            CtClass ctClass = getCtClass();
045    
046            buffer.append(ctClass.getName());
047    
048            try
049            {
050                CtClass[] interfaces = ctClass.getInterfaces();
051    
052                for (int i = 0; i < interfaces.length; i++)
053                {
054                    buffer.append(i == 0 ? " extends " : ", ");
055                    buffer.append(interfaces[i].getName());
056                }
057    
058            }
059            catch (Exception ex)
060            {
061                buffer.append("<Exception: " + ex + ">");
062            }
063    
064            Iterator i = _methods.iterator();
065    
066            while (i.hasNext())
067            {
068                MethodSignature sig = (MethodSignature) i.next();
069    
070                buffer.append("\n\npublic ");
071                buffer.append(sig);
072                buffer.append(";");
073            }
074    
075            buffer.append("\n]");
076    
077            return buffer.toString();
078        }
079    
080        public void addMethod(MethodSignature ms)
081        {
082            CtClass ctReturnType = convertClass(ms.getReturnType());
083            CtClass[] ctParameters = convertClasses(ms.getParameterTypes());
084            CtClass[] ctExceptions = convertClasses(ms.getExceptionTypes());
085    
086            CtMethod method = new CtMethod(ctReturnType, ms.getName(), ctParameters, getCtClass());
087    
088            try
089            {
090                method.setModifiers(Modifier.PUBLIC | Modifier.ABSTRACT);
091                method.setExceptionTypes(ctExceptions);
092    
093                getCtClass().addMethod(method);
094            }
095            catch (Exception ex)
096            {
097                throw new ApplicationRuntimeException(EnhanceMessages.unableToAddMethod(
098                        ms,
099                        getCtClass(),
100                        ex), ex);
101            }
102    
103            _methods.add(ms);
104        }
105    
106        public Class createInterface()
107        {
108            return createClass();
109        }
110    
111    }