/*

  * Copyright 2007-2009 The Kuali Foundation

  *

  * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php

  *

  * 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.kuali.rice.kns.util.documentserializer;

 import java.util.ArrayList;

 import java.util.List;

 /**

  * This object keeps track of most of the open tags while a document is serialized.  Note that instances of this class

  * may not necessarily hold all open tags of a document while it is being serialized.  For example, tags enclosing list elements

  * and map entries are not contained within here.  See {@link DocumentSerializerServiceImpl} to determine when this object's state

  * is modified.

  * 

  * This class's manipulators behave much like a stack, but it has random access characteristics like an array. 

  */

 public class SerializationState {

     protected class SerializationPropertyElement {

         private String elementName;

         private PropertyType propertyType;

         public SerializationPropertyElement(String elementName, PropertyType propertyType) {

             this.elementName = elementName;

             this.propertyType = propertyType;

         }

         public String getElementName() {

             return this.elementName;

         }

         public PropertyType getPropertyType() {

             return this.propertyType;

         }

     }

     private List<SerializationPropertyElement> pathElements;

     public SerializationState(){

         pathElements = new ArrayList<SerializationPropertyElement>();

     }

     /**

      * The number of property elements in this state object.

      * 

      * @return

      */

     public int numPropertyElements() {

         return pathElements.size();

     }

     /**

      * Adds an additional state element into this object.

      * 

      * @param elementName

      * @param propertyType the type of the property when it was serialized

      */

     public void addSerializedProperty(String elementName, PropertyType propertyType) {

         SerializationPropertyElement serializationPropertyElement = new SerializationPropertyElement(elementName, propertyType);

         pathElements.add(serializationPropertyElement);

     }

     /**

      * Removes the last added serialized property

      * 

      */

     public void removeSerializedProperty() {

         pathElements.remove(pathElements.size() - 1);

     }

     /**

      * Retrieves the element name of the state element.  A parameter value of 0 represents the first element that was added

      * by calling {@link #addSerializedProperty(String, PropertyType)} that hasn't been removed, and a value of 

      * {@link #numPropertyElements()} - 1 represents the element last added that hasn't been removed. 

      * 

      * @param propertyIndex most be between 0 and the value returned by {@link #numPropertyElements()} - 1

      * @return

      */

     public String getElementName(int propertyIndex) {

         return pathElements.get(propertyIndex).getElementName();

     }

     /**

      * Retrieves the property type of the state element.  A parameter value of 0 represents the first element that was added

      * by calling {@link #addSerializedProperty(String, PropertyType)} that hasn't been removed, and a value of 

      * {@link #numPropertyElements()} - 1 represents the element last added that hasn't been removed.

      * 

      * @param propertyIndex most be between 0 and the value returned by {@link #numPropertyElements()} - 1

      * @return

      */

     public PropertyType getPropertyType(int propertyIndex) {

         return pathElements.get(propertyIndex).getPropertyType();

     }

 }