content: /*
   * Copyright 2010-2025 Hyland Software, Inc. and its affiliates.
   *
   * Licensed 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.activiti.engine.impl.bpmn.diagram;
  
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.Set;
  import javax.xml.namespace.NamespaceContext;
  import javax.xml.xpath.XPath;
  
  /**
   * XML {@link NamespaceContext} containing the namespaces used by BPMN 2.0 XML documents.
   *
   * Can be used in {@link XPath#setNamespaceContext(NamespaceContext)}.
   *
  
   */
  public class Bpmn20NamespaceContext implements NamespaceContext {
  
      public static final String BPMN = "bpmn";
      public static final String BPMNDI = "bpmndi";
      public static final String OMGDC = "omgdc";
      public static final String OMGDI = "omgdi";
  
      /**
       * This is a protected filed so you can extend that context with your own namespaces if necessary
       */
      protected Map<String, String> namespaceUris = new HashMap<String, String>();
  
      public Bpmn20NamespaceContext() {
          namespaceUris.put(BPMN, "http://www.omg.org/spec/BPMN/20100524/MODEL");
          namespaceUris.put(BPMNDI, "http://www.omg.org/spec/BPMN/20100524/DI");
          namespaceUris.put(OMGDC, "http://www.omg.org/spec/DD/20100524/DI");
          namespaceUris.put(OMGDI, "http://www.omg.org/spec/DD/20100524/DC");
      }
  
      public String getNamespaceURI(String prefix) {
          return namespaceUris.get(prefix);
      }
  
      public String getPrefix(String namespaceURI) {
          return getKeyByValue(namespaceUris, namespaceURI);
      }
  
      public Iterator<String> getPrefixes(String namespaceURI) {
          return getKeysByValue(namespaceUris, namespaceURI).iterator();
      }
  
      private static <T, E> Set<T> getKeysByValue(Map<T, E> map, E value) {
          Set<T> keys = new HashSet<T>();
          for (Entry<T, E> entry : map.entrySet()) {
              if (value.equals(entry.getValue())) {
                  keys.add(entry.getKey());
              }
          }
          return keys;
      }
  
      private static <T, E> T getKeyByValue(Map<T, E> map, E value) {
          for (Entry<T, E> entry : map.entrySet()) {
              if (value.equals(entry.getValue())) {
                  return entry.getKey();
              }
          }
          return null;
      }
  }
  