/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements. See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership. The ASF licenses this file

  * to you under the Apache 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.apache.org/licenses/LICENSE-2.0

  *

  * 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.apache.shindig.social.core.util.xstream;

 import com.google.common.collect.Maps;

 import java.util.HashMap;

 import java.util.Map;

 import java.util.Set;

 import java.util.Map.Entry;

 /**

  * A container class that defines namespaces and subsequent element named for an

  * element in the output stack. A set of active namespaces are defined by

  * addNamespace and a name to prefixed name translation is specified by

  * addPrefixedElement.

  */

 public class NamespaceSet {

   /**

    * A map namespace attributes to the namespace uri.

    */

   private Map<String, String> namespaces = Maps.newHashMap();

   /**

    * A map of localElement names to prefixed element names.

    */

   private Map<String, String> elementNames = Maps.newHashMap();

   /**

    * Add a namespace to the list.

    *

    * @param nsAttribute

    *          the attribute to be used to specify the namespace

    * @param namespace

    *          the namespace URI

    */

   public void addNamespace(String nsAttribute, String namespace) {

     namespaces.put(nsAttribute, namespace);

   }

   /**

    * Add a localname translation.

    *

    * @param elementName

    *          the local name of the element

    * @param namespacedElementName

    *          the final name of the element with prefix.

    */

   public void addPrefixedElement(String elementName,

       String namespacedElementName) {

     elementNames.put(elementName, namespacedElementName);

   }

   /**

    * Convert an element name, if necessary.

    *

    * @param name

    *          the name to be converted.

    * @return the converted name, left as is if no conversion was required.

    */

   public String getElementName(String name) {

     String namespacedName = elementNames.get(name);

     if (namespacedName != null) {

       return namespacedName;

     }

     return name;

   }

   /**

    * @return an Set of entries containing the namespace attributes and uris,

    *         attributes in the key, uri's in the value or each entry.

    */

   public Set<Entry<String, String>> nameSpaceEntrySet() {

     return namespaces.entrySet();

   }

 }