/**
    * Copyright 2005-2011 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.krms.api.repository.agenda;
  
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.List;
  
  import javax.xml.bind.annotation.XmlAccessType;
  import javax.xml.bind.annotation.XmlAccessorType;
  import javax.xml.bind.annotation.XmlAnyElement;
  import javax.xml.bind.annotation.XmlElement;
  import javax.xml.bind.annotation.XmlElements;
  import javax.xml.bind.annotation.XmlRootElement;
  import javax.xml.bind.annotation.XmlType;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.core.api.CoreConstants;
  import org.kuali.rice.core.api.mo.AbstractDataTransferObject;
  import org.kuali.rice.core.api.mo.ModelBuilder;
  
  /**
   * Concrete model object implementation of KRMS Repository Agenda 
   * immutable. 
   * Instances of Agenda can be (un)marshalled to and from XML.
   *
   * @see AgendaDefinitionContract
   */
  @XmlRootElement(name = AgendaTreeDefinition.Constants.ROOT_ELEMENT_NAME)
  @XmlAccessorType(XmlAccessType.NONE)
  @XmlType(name = AgendaTreeDefinition.Constants.TYPE_NAME, propOrder = {
  		AgendaTreeDefinition.Elements.AGENDA_ID,
  		AgendaTreeDefinition.Elements.ENTRIES,
  		CoreConstants.CommonElements.FUTURE_ELEMENTS
  })
  public final class AgendaTreeDefinition extends AbstractDataTransferObject {
  	
  	private static final long serialVersionUID = 3355519740298280591L;
  
  	@XmlElement(name = Elements.AGENDA_ID, required = false)
  	private final String agendaId;
  	
  	@XmlElements(value = {
              @XmlElement(name = Elements.RULE, type = AgendaTreeRuleEntry.class, required = false),
              @XmlElement(name = Elements.SUB_AGENDA, type = AgendaTreeSubAgendaEntry.class, required = false)
  	})
  	private final List<AgendaTreeEntryDefinition> entries;
  		
  	@SuppressWarnings("unused")
      @XmlAnyElement
      private final Collection<org.w3c.dom.Element> _futureElements = null;
  	
  	/** 
       * This constructor should never be called.  
       * It is only present for use during JAXB unmarshalling. 
       */
      private AgendaTreeDefinition() {
      	this.agendaId = null;
      	this.entries = null;
      }
      
      private AgendaTreeDefinition(Builder builder) {
      	this.agendaId = builder.getAgendaId();
          this.entries = builder.getEntries();
      }
      
      public String getAgendaId() {
      	return agendaId;
      }
      
  	public List<AgendaTreeEntryDefinition> getEntries() {
  		if (entries == null){
  			return Collections.emptyList();
  		}
  		return Collections.unmodifiableList(entries);
  	}
  
      public static class Builder implements ModelBuilder, Serializable {
  		        
  		private static final long serialVersionUID = 7981215392039022620L;
  		
  		private String agendaId;
  		private List<AgendaTreeEntryDefinition> entries;
  
 		/**
 		 * Private constructor for creating a builder with all of it's required attributes.
 		 */
         private Builder() {
         	this.entries = new ArrayList<AgendaTreeEntryDefinition>();
         }
         
         public static Builder create(){
         	return new Builder();
         }
         
         public void setAgendaId(String agendaId) {
 			if (StringUtils.isBlank(agendaId)) {
 				throw new IllegalArgumentException("agendaItemId was null or blank");
 			}
         	this.agendaId = agendaId;
         }
         
         public void addRuleEntry(AgendaTreeRuleEntry ruleEntry) {
         	if (ruleEntry == null) {
         		throw new IllegalArgumentException("ruleEntry was null");
         	}
         	entries.add(ruleEntry);
         }
         
         public void addSubAgendaEntry(AgendaTreeSubAgendaEntry subAgendaEntry) {
         	if (subAgendaEntry == null) {
         		throw new IllegalArgumentException("subAgendaEntry was null");
         	}
         	entries.add(subAgendaEntry);
         }
         
         public String getAgendaId() {
         	return this.agendaId;
         }
         
         public List<AgendaTreeEntryDefinition> getEntries() {
         	return this.entries;
         }
 
         @Override
         public AgendaTreeDefinition build() {
             return new AgendaTreeDefinition(this);
         }
 		
     }
 	
 	/**
 	 * Defines some internal constants used on this class.
 	 */
 	static class Constants {
 		final static String ROOT_ELEMENT_NAME = "agendaTreeDefinition";
 		final static String TYPE_NAME = "AgendaTreeDefinition";
 	}
 	
 	/**
 	 * A private class which exposes constants which define the XML element names to use
 	 * when this object is marshalled to XML.
 	 */
 	static class Elements {
 		final static String AGENDA_ID = "agendaId";
 		final static String ENTRIES = "entries";
 		final static String RULE = "rule";
 		final static String SUB_AGENDA = "subAgenda";
 	}
 
 }