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/*
 * ArrayValue.java April 2007
 *
 * Copyright (C) 2007, Niall Gallagher 
 *
 * 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.simpleframework.xml.strategy;

/**
 * The ArrayValue object is a value used for describing
 * arrays for a specified component type object. This provides the
 * component type for the array as well as the length of the array,
 * which allows the deserialization process to build a suitable length
 * array from the criteria taken from the XML element.
 * 
 * @author Niall Gallagher
 * 
 * @see org.simpleframework.xml.strategy.Allocate
 */
class ArrayValue implements Value {
   
   /**
    * This is the value that has been set within this value object.
    */
   private Object value;
   
   /**
    * This is the optional field type for the array to be created. 
    */
   private Class type;
   
   /**
    * This is used to determine the size of the array to be created.
    */
   private int size;
   
   /**
    * Constructor for the ArrayValue object. This will
    * provide sufficient criteria to the deserialization process 
    * to instantiate an array of the specified size an type.
    * 
    * @param type this is the component type for the array
    * @param size this is the size of the array to instantiate
    */
   public ArrayValue(Class type, int size) {
      this.type = type;      
      this.size = size;
   }
   
   /**
    * This is the instance that is acquired from this value. This is
    * typically used if the isReference method is true.
    * If there was no value reference provided then this returns null.
    * 
    * @return this returns a reference to an existing array
    */
   public Object getValue() {
      return value;
   }
   
   /**
    * This method is set the value so that future calls provide the
    * value that was provided. Setting the value ensures that the
    * value used is consistent across invocations of this object.
    * 
    * @param value this is the value to inserted to this object
    */
   public void setValue(Object value) {
      this.value = value;
   }
   
   /**
    * This will return the component type for the array instance 
    * that is described by this object. This is used to ensure that
    * an array with the correct component type can be instantiated.
    * 
    * @return this returns the component type for the array
    */
   public Class getType() {
      return type;
   }

   /**
    * This returns the length of the array that is to be allocated.
    * For various Strategy implementations the length
    * is provided as an attribute on the array XML element.
    * 
    * @return this returns the number of elements for the array
    */
   public int getLength() {
      return size;
   } 
   
   /**
    * This will return false for the array value because the array
    * is not a reference type. Only Reference values 
    * will have this set to true as they read from the graph.
    * 
    * @return this returns false as this is not a reference value
    */
   public boolean isReference() {
      return false;
   }  
}