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   package org.kuali.rice.krms.api.repository;
   
   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.XmlRootElement;
  import javax.xml.bind.annotation.XmlType;
  import org.kuali.rice.core.api.CoreConstants;
  import org.kuali.rice.core.api.mo.ModelBuilder;
  import org.kuali.rice.krms.api.KrmsConstants;
  
  /**
   * Concrete model object implementation of a natural language tree immutable.
   * Instances of natural language tree can be (un)marshalled to and from XML.
   *
   * @see NaturalLanguageTreeContract
   */
  @XmlRootElement(name = NaturalLanguageTree.Constants.ROOT_ELEMENT_NAME)
  @XmlAccessorType(XmlAccessType.NONE)
  @XmlType(name = NaturalLanguageTree.Constants.TYPE_NAME, propOrder = {
      NaturalLanguageTree.Elements.NATURAL_LANGUAGE,
      NaturalLanguageTree.Elements.CHILDREN,
      CoreConstants.CommonElements.FUTURE_ELEMENTS
  })
  public class NaturalLanguageTree implements NaturalLanguageTreeContract {
  
      private static final long serialVersionUID = 2783959459503209577L;
      @XmlElement(name = NaturalLanguageTree.Elements.NATURAL_LANGUAGE, required = false)
      private String naturalLanguage;
      @XmlElement(name = NaturalLanguageTree.Elements.CHILDREN, required = false)
      private List<NaturalLanguageTree> children;
      @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.
       */
      public NaturalLanguageTree() {
          this.naturalLanguage = null;
          this.children = null;
      }
  
      @Override
      public String getNaturalLanguage() {
          return naturalLanguage;
      }
  
      @Override
      public List<NaturalLanguageTree> getChildren() {
          return children;
      }
  
      /**
       * Constructs a KRMS Repository Agenda object from the given builder. This
       * constructor is private and should only ever be invoked from the builder.
       *
       * @param builder the Builder from which to construct the Agenda
       */
      private NaturalLanguageTree(Builder builder) {
          this.naturalLanguage = builder.getNaturalLanguage();
          List<NaturalLanguageTree> list = null;
          if (builder.getChildren() != null) {
              list = new ArrayList<NaturalLanguageTree>(builder.getChildren().size());
              for (NaturalLanguageTreeContract nltree : builder.getChildren()) {
                  list.add(Builder.create(nltree).build());
              }
              this.children = Collections.unmodifiableList(list);
          }
      }
  
      /**
       * This builder is used to construct instances of KRMS Repository Agenda. It
       * enforces the constraints of the {@link NaturalLanguageTreeContract}.
       */
      public static class Builder implements NaturalLanguageTreeContract, ModelBuilder, Serializable {
  
          private static final long serialVersionUID = -8862851720709537839L;
          private String naturalLanguage;
          private List<? extends NaturalLanguageTreeContract> children;
   
          /**
           * Private constructor for creating a builder with all of it's required
           * attributes.
           */
          private Builder() {
          }        
          
         /**
          * Private constructor for creating a builder with all of it's required
          * attributes.
          */
         private Builder(String naturalLanguage, List<? extends NaturalLanguageTreeContract> children) {
             setNaturalLanguage(naturalLanguage);
             setChildren(children);
         }
 
         @Override
         public String getNaturalLanguage() {
             return naturalLanguage;
         }
 
         public void setNaturalLanguage(String naturalLanguage) {
             this.naturalLanguage = naturalLanguage;
         }
 
         @Override
         public List<? extends NaturalLanguageTreeContract> getChildren() {
             return children;
         }
 
         public void setChildren(List<? extends NaturalLanguageTreeContract> children) {
             this.children = children;
         }
 
         
         /**
          * Creates a builder by populating it with data from the given
          * {@link NaturalLanguageTreeContract}.
          *
          * @param contract the contract from which to populate this builder
          * @return an instance of the builder populated with data from the
          * contract
          * @throws IllegalArgumentException if the contract is null
          */
         public static NaturalLanguageTree.Builder create() {
             NaturalLanguageTree.Builder builder = new NaturalLanguageTree.Builder();
             return builder;
         }
         /**
          * Creates a builder by populating it with data from the given
          * {@link NaturalLanguageTreeContract}.
          *
          * @param contract the contract from which to populate this builder
          * @return an instance of the builder populated with data from the
          * contract
          * @throws IllegalArgumentException if the contract is null
          */
         public static NaturalLanguageTree.Builder create(NaturalLanguageTreeContract contract) {
             if (contract == null) {
                 throw new IllegalArgumentException("contract is null");
             }
             NaturalLanguageTree.Builder builder = new NaturalLanguageTree.Builder(contract.getNaturalLanguage(), contract.getChildren());
 
             return builder;
         }
 
         /**
          * Builds an instance of a Natural Language Tree based on the current state of the
          * builder.
          *
          * @return the fully-constructed Agenda
          */
         @Override
         public NaturalLanguageTree build() {
             return new NaturalLanguageTree(this);
         }
     }
 
     /**
      * Defines some constants used on this class.
      */
     public static class Constants {
 
         final static String ROOT_ELEMENT_NAME = "naturalLanguageTree";
         final static String TYPE_NAME = "NaturalLanguageTreeType";
         final static String[] HASH_CODE_EQUALS_EXCLUDE = {"_futureElements"};
         public final static String EVENT = "Event";   // key for event attribute
     }
 
     /**
      * A private class which exposes constants which define the XML element
      * names to use when this object is marshalled to XML.
      */
     public static class Elements {
 
         final static String NATURAL_LANGUAGE = "naturalLanguage";
         final static String CHILDREN = "children";
     }
 
     public static class Cache {
 
         public static final String NAME = KrmsConstants.Namespaces.KRMS_NAMESPACE_2_0 + "/" + NaturalLanguageTree.Constants.TYPE_NAME;
     }
 }