FixedAttributeProvider.java

/*
 * This file is part of the Trickl Open Source Libraries.
 *
 * Trickl Open Source Libraries - http://open.trickl.com/
 *
 * Copyright (C) 2011 Tim Gee.
 *
 * Trickl Open Source Libraries are free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Trickl Open Source Libraries are distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this project.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.trickl.graph.ext;

import java.util.HashMap;
import java.util.Map;
import org.jgrapht.ext.ComponentAttributeProvider;

/**
 *
 * @author tgee
 */
public class FixedAttributeProvider<T> implements ComponentAttributeProvider<T> {

   final private Map<String, String> fixedAttributes;
   
   final private ComponentAttributeProvider<T> chainProvider;
   
   /**
    * Create a component provider that gives fixed attributes, regardless
    * of the component.
    * @param attributes
    * @param chainedProvider Another provider to use
    */
   public FixedAttributeProvider(Map<String, String> attributes, ComponentAttributeProvider<T> chainedProvider) {
      this.fixedAttributes = attributes;
      this.chainProvider = chainedProvider;
   }
   
   public FixedAttributeProvider(Map<String, String> fixedAttributes) {
      this(fixedAttributes, null);
   }
   
   @Override
   public Map<String, String> getComponentAttributes(T component) {
      Map<String, String> attributes = new HashMap<String, String>(fixedAttributes);
      if (chainProvider != null) {
         attributes.putAll(chainProvider.getComponentAttributes(component));
      }
      return attributes;
   }
   
}