/**
    * Copyright 2005-2014 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.framework.document.security;
  
  import org.apache.commons.collections.CollectionUtils;
  import org.kuali.rice.core.api.CoreConstants;
  import org.kuali.rice.core.api.mo.ModelObjectUtils;
  import org.kuali.rice.kew.api.document.Document;
  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.util.Collection;
  import java.util.List;
  
  /**
   * Defines a directive for processing a list of security attributes against a supplied list of documents.  The names of
   * these security attributes represent the name of an {@link org.kuali.rice.kew.api.extension.ExtensionDefinition} which
   * will be used to load the appropriate {@link DocumentSecurityAttribute} implementation in order to perform the security filtering.
   *
   * <p>The actual directive is supplied to the appropriate application that is responsible for the given security attributes
   * by invoking that applications {@link DocumentSecurityHandlerService}.  This class primarily functions as a form of
   * data transport in order to package and send the required information.</p>
   *
   * @see DocumentSecurityAttribute
   * @see DocumentSecurityHandlerService
   * @see org.kuali.rice.kew.api.extension.ExtensionDefinition
   */
  @XmlRootElement(name = DocumentSecurityDirective.Constants.ROOT_ELEMENT_NAME)
  @XmlAccessorType(XmlAccessType.NONE)
  @XmlType(name = DocumentSecurityDirective.Constants.TYPE_NAME, propOrder = {
      DocumentSecurityDirective.Elements.DOCUMENT_SECURITY_ATTRIBUTE_NAMES,
      DocumentSecurityDirective.Elements.DOCUMENTS,
      CoreConstants.CommonElements.FUTURE_ELEMENTS
  })
  public final class DocumentSecurityDirective {
  
      @XmlElementWrapper(name = Elements.DOCUMENT_SECURITY_ATTRIBUTE_NAMES, required = true)
      @XmlElement(name = Elements.DOCUMENT_SECURITY_ATTRIBUTE_NAME, required = true)
      private final List<String> documentSecurityAttributeNames;
  
      @XmlElementWrapper(name = Elements.DOCUMENTS, required = true)
      @XmlElement(name = Elements.DOCUMENT, required = true)
      private final List<Document> documents;
  
      @SuppressWarnings("unused")
      @XmlAnyElement
      private final Collection<Element> _futureElements = null;
  
      /**
       * Private constructor used only by JAXB.
       */
      @SuppressWarnings("unused")
      private DocumentSecurityDirective() {
          this.documentSecurityAttributeNames = null;
          this.documents = null;
      }
  
      private DocumentSecurityDirective(List<String> documentSecurityAttributeNames, List<Document> documents) {
          if (CollectionUtils.isEmpty(documentSecurityAttributeNames)) {
              throw new IllegalArgumentException("documentSecurityAttributeNames cannot be null or empty");
          }
          this.documentSecurityAttributeNames = ModelObjectUtils.createImmutableCopy(documentSecurityAttributeNames);
          this.documents = ModelObjectUtils.createImmutableCopy(documents);
      }
  
      /**
       * Creates a new security directive from the given list of document secruity attribute names and documents.
       *
       * @param documentSecurityAttributeNames the list of document security attribute names with which to create this
       * security directive
       * @param documents the list of documents with which to create this security directive
       *
       * @return a new document security directive instance
       *
       * @throws IllegalArgumentException if the given list of security attribute names is null or empty
       */
      public static DocumentSecurityDirective create(List<String> documentSecurityAttributeNames,
              List<Document> documents) {
          return new DocumentSecurityDirective(documentSecurityAttributeNames, documents);
      }
 
     /**
      * Returns the list of document security attribute names on this security directive.  Will never return a null or
      * empty list.
      *
      * @return the list of document security attribute names on this security directive
      */
     public List<String> getDocumentSecurityAttributeNames() {
         return documentSecurityAttributeNames;
     }
 
     /**
      * Returns the list of documents on this security directive.  Will never return null, but may return an empty list.
      *
      * @return the list of documents on this security directive
      */
     public List<Document> getDocuments() {
         return documents;
     }
 
     /**
      * Defines some internal constants used on this class.
      */
     static class Constants {
         final static String ROOT_ELEMENT_NAME = "documentSecurityDirective";
         final static String TYPE_NAME = "DocumentSecurityDirectiveType";
     }
 
     /**
      * 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 DOCUMENT_SECURITY_ATTRIBUTE_NAMES = "documentSecurityAttributeNames";
         final static String DOCUMENT_SECURITY_ATTRIBUTE_NAME = "documentSecurityAttributeName";
         final static String DOCUMENTS = "documents";
         final static String DOCUMENT = "document";
     }
 
 }