/*

  * Copyright 2002-2004 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.commons.clazz.bean;

 import org.apache.commons.clazz.Clazz;

 import org.apache.commons.clazz.ClazzInstanceFactory;

 import org.apache.commons.clazz.ClazzLoader;

 import org.apache.commons.clazz.common.ClazzFeatureSupport;

 /**

  * 

  * @author <a href="mailto:dmitri@apache.org">Dmitri Plotnikov</a>

  * @version $Id: BeanClazzInstanceFactory.java 155436 2005-02-26 13:17:48Z dirkv $

  */

 public abstract class BeanClazzInstanceFactory

     extends ClazzFeatureSupport

     implements ClazzInstanceFactory 

 {

     private String name;

     private static final String[] EMPTY_STRING_ARRAY = new String[0];

     private String[] parameterClazzNames;

     private Clazz[] parameterClazzes;

     private String signature;

     public BeanClazzInstanceFactory(

             Clazz declaringClazz,

             String parameterClazzNames[])

     {

         this(declaringClazz, null, parameterClazzNames);

     }

     /**

      * Constructor for BeanClazzInstanceFactory.

      * @param declaringClazz

      */

     public BeanClazzInstanceFactory(

             Clazz declaringClazz,

             String name,

             String parameterClazzNames[]) 

     {

         super(declaringClazz);

         this.name = name;

         this.parameterClazzNames = parameterClazzNames;

         this.parameterClazzNames =

             (parameterClazzNames != null

                 ? parameterClazzNames

                 : EMPTY_STRING_ARRAY);

     }

     /**

      * @see org.apache.commons.clazz.ClazzInstanceFactory#getName()

      */

     public String getName() {

         return name;

     }

     /**

      * @see org.apache.commons.clazz.ClazzInstanceFactory#getParameterClazzes()

      */

     public Clazz[] getParameterClazzes() {

         if (parameterClazzes == null) {

             parameterClazzes = new Clazz[parameterClazzNames.length];

             ClazzLoader loader = getDeclaringClazz().getClazzLoader();

             for (int i = 0; i < parameterClazzes.length; i++) {

                 parameterClazzes[i] =

                     loader.getClazzForName(parameterClazzNames[i]);

                 if (parameterClazzes[i] == null) {

                     throw new BeanClazzConfigurationException(

                         "Invalid argument type: "

                             + parameterClazzNames[i]

                             + ". Clazz not found.");

                 }

             }

         }

         return parameterClazzes;

     }

     /**

      * @see org.apache.commons.clazz.ClazzInstanceFactory#getSignature()

      */

     public String getSignature() {

         if (signature == null) {

             signature = Clazz.constructSignature(name, getParameterClazzes());

         }

         return signature;

     }

 }