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/* 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.repository;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;


/**
 * Stores a two-dimensional graph layout.
 *
 * @author Falko Menge
 */
public class DiagramLayout implements Serializable {

  private static final long serialVersionUID = 1L;
  
  private Map elements;

  public DiagramLayout(Map elements) {
    this.setElements(elements);
  }

  public DiagramNode getNode(String id) {
    DiagramElement element = getElements().get(id);
    if (element instanceof DiagramNode) {
      return (DiagramNode) element;
    } else {
      return null;
    }
  }
  
  public DiagramEdge getEdge(String id) {
    DiagramElement element = getElements().get(id);
    if (element instanceof DiagramEdge) {
      return (DiagramEdge) element;
    } else {
      return null;
    }
  }
  
  public Map getElements() {
    return elements;
  }
  
  public void setElements(Map elements) {
    this.elements = elements;
  }

  public List getNodes() {
    List nodes = new ArrayList();
    for (Entry entry : getElements().entrySet()) {
      DiagramElement element = entry.getValue();
      if (element instanceof DiagramNode) {
        nodes.add((DiagramNode) element);
      }
    }
    return nodes;
  }
  
}