/*

  * Copyright 2006-2011 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.kim.api.common.assignee;

 import org.apache.commons.collections.CollectionUtils;

 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.kuali.rice.kim.api.common.delegate.DelegateType;

 import org.kuali.rice.kim.api.common.delegate.DelegateTypeContract;

 import org.w3c.dom.Element;

 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.XmlElementWrapper;

 import javax.xml.bind.annotation.XmlRootElement;

 import javax.xml.bind.annotation.XmlType;

 import java.io.Serializable;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.Collections;

 import java.util.List;

 @XmlRootElement(name = Assignee.Constants.ROOT_ELEMENT_NAME)

 @XmlAccessorType(XmlAccessType.NONE)

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

         Assignee.Elements.PRINCIPAL_ID,

         Assignee.Elements.GROUP_ID,

         Assignee.Elements.DELEGATES,

         CoreConstants.CommonElements.FUTURE_ELEMENTS

 })

 public class Assignee extends AbstractDataTransferObject implements AssigneeContract {

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

     private final String principalId;

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

     private final String groupId;

     @XmlElementWrapper(name = Elements.DELEGATES, required = false)

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

     private final List<DelegateType> delegates;

     @SuppressWarnings("unused")

     @XmlAnyElement

     private final Collection<Element> _futureElements = null;

     /**

          *  A constructor to be used only by JAXB unmarshalling.

          *  

          */

     private Assignee() {

         this.principalId = null;

         this.groupId = null;

         this.delegates = null;

     }

     /**

          * A constructor using the Builder.

          * 

          * @param builder

          */

     public Assignee(Builder builder) {

         this.principalId = builder.getPrincipalId();

         this.groupId = builder.getGroupId();

         final List<DelegateType> temp = new ArrayList<DelegateType>();

         if (!CollectionUtils.isEmpty(builder.getDelegates())) {

             for (DelegateType.Builder delegate: builder.getDelegates()) {

                 temp.add(delegate.build());

             }

         }

         this.delegates = Collections.unmodifiableList(temp);

     }

         /**

          * @see AssigneeContract#getPrincipalId()

          */

         @Override

         public String getPrincipalId() {

                 return this.principalId;

         }

         /**

          * @see AssigneeContract#getGroupId()

          */

         @Override

         public String getGroupId() {

                 return this.groupId;

         }

         /**

          * @see AssigneeContract#getDelegates()

          */

         @Override

         public List<DelegateType> getDelegates() {

                 return this.delegates;

         }

     /**

      * This builder constructs a PermissionAssignee enforcing the constraints of the {@link AssigneeContract}.

      */

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

         private String principalId;

         private String groupId;

         private List<DelegateType.Builder> delegates;

         private Builder(String principalId, String groupId, List<DelegateType.Builder> delegates) {

             setPrincipalId(principalId);

             setGroupId(groupId);

             setDelegates(delegates);

         }

         /**

          * Creates a KimAttributeData with the required fields.

          */

         public static Builder create(String principalId, String groupId, List<DelegateType.Builder> delegates) {

             return new Builder(principalId, groupId, delegates);

         }

         /**

          * creates a KimAttributeData from an existing {@link org.kuali.rice.kim.api.common.attribute.KimAttributeDataContract}.

          */

         public static Builder create(AssigneeContract contract) {

             final List<DelegateType.Builder> builders = new ArrayList<DelegateType.Builder>();

             for (DelegateTypeContract d : contract.getDelegates()) {

                 builders.add(DelegateType.Builder.create(d));

             }

             Builder builder = new Builder(contract.getPrincipalId(), contract.getGroupId(), builders);

             return builder;

         }

         @Override

         public String getPrincipalId() {

             return principalId;

         }

         public void setPrincipalId(final String principalId) {

             if (StringUtils.isBlank(principalId)) {

                 throw new IllegalArgumentException("principalId is blank");

             }

             this.principalId = principalId;

         }

         @Override

         public String getGroupId() {

             return groupId;

         }

         public void setGroupId(final String groupId) {

                 if (StringUtils.isBlank(groupId)) {

                 throw new IllegalArgumentException("groupId is blank");

             }

                 this.groupId = groupId;

         }

                 @Override

                 public List<DelegateType.Builder> getDelegates() {

                         return delegates;

                 }

         public void setDelegates(final List<DelegateType.Builder> delegates) {

                 if (delegates == null || delegates.isEmpty()) {

                 throw new IllegalArgumentException("delegates is null or empty");

             }

                 this.delegates = Collections.unmodifiableList(new ArrayList<DelegateType.Builder>(delegates));

         }                

                 @Override

                 public Assignee build() {

                         return new Assignee(this);

                 }

     }

     /**

      * Defines some internal constants used on this class.

      */

     static class Constants {

         final static String ROOT_ELEMENT_NAME = "assignee";

         final static String TYPE_NAME = "assigneeType";

     }

     /**

      * 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 PRINCIPAL_ID = "principalId";

         final static String GROUP_ID = "groupId";

         final static String DELEGATES = "delegates";

         final static String DELEGATE = "delegate";

     }

 }