/*
    * 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.reflect.common;
  
  import java.lang.reflect.Field;
  import java.lang.reflect.Method;
  
  import org.apache.commons.clazz.Clazz;
  import org.apache.commons.clazz.ClazzAccessException;
  import org.apache.commons.clazz.common.ClazzFeatureSupport;
  import org.apache.commons.clazz.reflect.ReflectedProperty;
  
  /**
   * 
   * @author <a href="mailto:dmitri@apache.org">Dmitri Plotnikov</a>
   * @version $Id: ReflectedAccessorPairProperty.java 155436 2005-02-26 13:17:48Z dirkv $
   */
  public class ReflectedAccessorPairProperty extends ClazzFeatureSupport 
          implements ReflectedProperty 
  {
      private String name;
      private static final String[] EMPTY_STRING_ARRAY = new String[0];
      private String[] aliases = EMPTY_STRING_ARRAY;
      private Class type;
      private Clazz clazz;
      private Field field;
      private Method readMethod;
      private Method writeMethod;
      
      /**
       * Constructor for ReflectedClazzProperty.
       */
      public ReflectedAccessorPairProperty(Clazz declaringClazz, String name) {
          super(declaringClazz);
          this.name = name;
      }
  
      /**
       * @see org.apache.commons.clazz.ClazzProperty#getName()
       */
      public String getName() {
          return name;
      }
      
      /**
       * Returns the aliases.
       * @return String[]
       */
      public String[] getAliases() {
          return aliases;
      }
  
      /**
       * Sets the aliases.
       * @param aliases The aliases to set
       */
      public void setAliases(String[] aliases) {
          this.aliases = aliases;
      }
      
      /**
       * @see org.apache.commons.clazz.ClazzProperty#getClazz()
       */
      public Clazz getClazz() {
          if (clazz == null) {
              clazz = getDeclaringClazz().
                  getClazzLoader().getClazzForName(type.getName());
          }
          return clazz;
      }
      
      /**
       * @see org.apache.commons.clazz.ClazzProperty#getContentClazz()
       */
      public Clazz getContentClazz() {
          return null;
      }
  
      /**
       * @see org.apache.commons.clazz.ClazzProperty#getKeyClazz()
       */
      public Clazz getKeyClazz() {
          return null;
      }
  
      /**
      * @see org.apache.commons.clazz.ClazzProperty#isReadOnly()
      */
     public boolean isReadOnly() {
         return false;
     }
 
     /**
      * Returns the field.
      * @return Field
      */
     public Field getField() {
         return field;
     }
 
     /**
      * Returns the readMethod.
      * @return Method
      */
     public Method getReadMethod() {
         return readMethod;
     }
 
 
     /**
      * Sets the field.
      * @param field The field to set
      */
     public void setField(Field field) {
         this.field = field;
     }
 
     /**
      * Sets the readMethod.
      * @param readMethod The readMethod to set
      */
     public void setReadMethod(Method readMethod) {
         this.readMethod = readMethod;
     }
     
     /**
      * Returns the writeMethod.
      * @return Method
      */
     public Method getWriteMethod() {
         return writeMethod;
     }
     
     /**
      * Sets the writeMethod.
      * @param writeMethod The writeMethod to set
      */
     public void setWriteMethod(Method writeMethod) {
         this.writeMethod = writeMethod;
     }
     
     /**
      * @see org.apache.commons.clazz.ClazzProperty#get(java.lang.Object)
      */
     public Object get(Object instance) {
         if (readMethod == null) {
             throw new ClazzAccessException(
                 "Cannot read property " + name + ": no read method");
         }
         try {
             return readMethod.invoke(instance, null);
         }
         catch (Exception ex) {
             throw new ClazzAccessException(
                 "Cannot get property : "
                     + name
                     + ": cannot invoke method: "
                     + readMethod.getName(),
                 ex);
         }
     }
 
     /**
      * @see org.apache.commons.clazz.ClazzProperty#set(Object, Object)
      */
     public void set(Object instance, Object value) {
         if (writeMethod == null) {
             throw new ClazzAccessException(
                 "Cannot modify property " + name + ": no write method");
         }
         try {
             writeMethod.invoke(instance, new Object[]{value});
         }
         catch (Exception ex) {
             throw new ClazzAccessException(
                 "Cannot set property : "
                     + name
                     + ": cannot invoke method: "
                     + writeMethod.getName(),
                 ex);
         }
     }
 
 
     /**
      * Returns the type.
      * @return Class
      */
     public Class getType() {
         return type;
     }
 
     /**
      * Sets the type.
      * @param type The type to set
      */
     public void setType(Class type) {
         this.type = type;
     }
     
     /**
      * @see org.apache.commons.clazz.ClazzProperty#isCollection()
      */
     public boolean isCollection() {
         return false;
     }
 
     /**
      * @see org.apache.commons.clazz.ClazzProperty#isMap()
      */
     public boolean isMap() {
         return false;
     }
 
 }