/**
    * Copyright (C) 2010-2012 Joerg Bellmann <joerg.bellmann@googlemail.com>
    *
    * 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 com.googlecode.t7mp.configuration;
  
  import java.io.File;
  import java.util.LinkedList;
  import java.util.List;
  
  import org.apache.commons.lang.Validate;
  
  /**
   * 
   * @author Joerg Bellmann
   *
   */
  public class ChainedArtifactResolver implements PluginArtifactResolver {
  
      protected List<PluginArtifactResolver> resolverChain = new LinkedList<PluginArtifactResolver>();
  
      public ChainedArtifactResolver() {
          this.resolverChain.add(new SystemPathArtifactResolver());
      }
  
      @Override
      public File resolveArtifact(final String coordinates) throws ResolutionException {
          File result = null;
          for (PluginArtifactResolver resolver : resolverChain) {
              try {
                  result = resolver.resolveArtifact(coordinates);
                  if (result != null) {
                      break;
                  }
                  //CHECKSTYLE.OFF: Empty catch block
              } catch (ResolutionException e) {
              }
              //CHECKSTYLE.ON: Empty catch block
          }
          if (result == null) {
              throw new ResolutionException("Could not resolve artifact with coordinates " + coordinates);
          }
          return result;
      }
  
      public void addPluginArtifactResolver(PluginArtifactResolver pluginArtifactResolver) {
          Validate.notNull(pluginArtifactResolver, "PluginArtifactResolvers should not be null");
          this.resolverChain.add(pluginArtifactResolver);
      }
  
  }