/**
 *  ServingXML
 *  
 *  Copyright (C) 2006  Daniel Parker
 *    daniel.parker@servingxml.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.servingxml.components.streamsource.url;

import java.net.URL;
import java.nio.charset.Charset;

import com.servingxml.components.common.UrlEvaluator;
import com.servingxml.app.ServiceContext;
import com.servingxml.io.streamsource.StreamSource;
import com.servingxml.io.streamsource.url.UrlSource;
import com.servingxml.components.streamsource.StreamSourceFactory;
import com.servingxml.app.Flow;

/**
 * The <code>UrlSourceFactory</code> implements a class that
 * does parameter substitution in strings.
 * 
 * @author Daniel A. Parker (daniel.parker@servingxml.com)
 */
                          
public class UrlSourceFactory 
implements StreamSourceFactory {
                                                       
  private final UrlEvaluator urlResolver;
  private final Charset charset;
  
  public UrlSourceFactory(UrlEvaluator urlResolver) {
    this.urlResolver = urlResolver;
    this.charset = null;
  }

  public UrlSourceFactory(UrlEvaluator urlResolver, Charset charset) {
    this.urlResolver = urlResolver;
    this.charset = charset;
  }

  public StreamSource createStreamSource(ServiceContext context, Flow flow) {
    URL url = urlResolver.evaluateUrl(flow.getParameters(), flow.getRecord());
    return new UrlSource(url, charset);
  }
}

