/**

  * 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.kew.api.document;

 import java.io.Serializable;

 import java.util.Collection;

 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.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;

 import org.w3c.dom.Element;

 @XmlRootElement(name = DocumentLink.Constants.ROOT_ELEMENT_NAME)

 @XmlAccessorType(XmlAccessType.NONE)

 @XmlType(name = DocumentLink.Constants.TYPE_NAME, propOrder = {

             DocumentLink.Elements.ID,

                 DocumentLink.Elements.ORIGINATING_DOCUMENT_ID,

                 DocumentLink.Elements.DESTINATION_DOCUMENT_ID,

                 CoreConstants.CommonElements.FUTURE_ELEMENTS

 })

 public final class DocumentLink extends AbstractDataTransferObject implements DocumentLinkContract {

         private static final long serialVersionUID = -1193048221115914280L;

         @XmlElement(name = Elements.ID, required = false)

     private final String id;

     @XmlElement(name = Elements.ORIGINATING_DOCUMENT_ID, required = true)

     private final String originatingDocumentId;

     @XmlElement(name = Elements.DESTINATION_DOCUMENT_ID, required = true)

     private final String destinationDocumentId;

     @SuppressWarnings("unused")

     @XmlAnyElement

     private final Collection<Element> _futureElements = null;

     /**

      * Private constructor used only by JAXB.

      */

     private DocumentLink() {

         this.id = null;

             this.originatingDocumentId = null;

         this.destinationDocumentId = null;

     }

     private DocumentLink(Builder builder) {

         this.id = builder.getId();

             this.originatingDocumentId = builder.getOriginatingDocumentId();

         this.destinationDocumentId = builder.getDestinationDocumentId();

     }

     @Override

     public String getId() {

         return this.id;

     }

     @Override

     public String getOriginatingDocumentId() {

         return this.originatingDocumentId;

     }

     @Override

     public String getDestinationDocumentId() {

         return this.destinationDocumentId;

     }

     /**

      * A builder which can be used to construct {@link DocumentLink} instances.  Enforces the constraints of the {@link DocumentLinkContract}.

      */

     public final static class Builder implements Serializable, ModelBuilder, DocumentLinkContract {

                 private static final long serialVersionUID = -6713990840543140054L;

                 private String id;

         private String originatingDocumentId;

         private String destinationDocumentId;

         private Builder(String originatingDocumentId, String destinationDocumentId) {

             setOriginatingDocumentId(originatingDocumentId);

             setDestinationDocumentId(destinationDocumentId);

             if (getOriginatingDocumentId().equals(getDestinationDocumentId())) {

                     throw new IllegalArgumentException("originating and destination document ids were the same, cannot link a document with itself");

             }

         }

         public static Builder create(String originatingDocumentId, String destinationDocumentId) {

             return new Builder(originatingDocumentId, destinationDocumentId);

         }

         public static Builder create(DocumentLinkContract contract) {

             if (contract == null) {

                 throw new IllegalArgumentException("contract was null");

             }

             Builder builder = create(contract.getOriginatingDocumentId(), contract.getDestinationDocumentId());

             builder.setId(contract.getId());

             return builder;

         }

         public DocumentLink build() {

             return new DocumentLink(this);

         }

         @Override

         public String getId() {

             return this.id;

         }

         @Override

         public String getOriginatingDocumentId() {

             return this.originatingDocumentId;

         }

         @Override

         public String getDestinationDocumentId() {

             return this.destinationDocumentId;

         }

         public void setId(String id) {

             this.id = id;

         }

         public void setOriginatingDocumentId(String originatingDocumentId) {

             if (StringUtils.isBlank(originatingDocumentId)) {

                     throw new IllegalArgumentException("originatingDocumentId was null or blank");

             }

             this.originatingDocumentId = originatingDocumentId;

         }

         public void setDestinationDocumentId(String destinationDocumentId) {

                 if (StringUtils.isBlank(destinationDocumentId)) {

                     throw new IllegalArgumentException("destinationDocumentId was null or blank");

             }

             this.destinationDocumentId = destinationDocumentId;

         }

     }

     /**

      * Defines some internal constants used on this class.

      */

     static class Constants {

         final static String ROOT_ELEMENT_NAME = "documentLink";

         final static String TYPE_NAME = "DocumentLinkType";

     }

     /**

      * 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 ID = "id";

         final static String ORIGINATING_DOCUMENT_ID = "originatingDocumentId";

         final static String DESTINATION_DOCUMENT_ID = "destinationDocumentId";

     }

 }