// BSD License (http://www.galagosearch.org/license)

 package org.galagosearch.core.index;

 import org.galagosearch.tupleflow.InputClass;

 import org.galagosearch.tupleflow.TupleFlowParameters;

 import org.galagosearch.tupleflow.Parameters;

 import org.galagosearch.tupleflow.Processor;

 import org.galagosearch.tupleflow.execution.ErrorHandler;

 import org.galagosearch.tupleflow.execution.Verification;

 import org.galagosearch.tupleflow.types.XMLFragment;

 import java.io.File;

 import java.io.IOException;

 /**

  *    

  * @author trevor

  */

 @InputClass(className = "org.galagosearch.tupleflow.types.XMLFragment")

 public class ManifestWriter implements Processor<XMLFragment> {

     String filename;

     Parameters result;

     /** Creates a new instance of ManifestWriter */

     public ManifestWriter(TupleFlowParameters p) throws IOException {

         if (p.getXML().containsKey("xml")) {

             Parameters.Value value = p.getXML().value().map().get("xml").get(0);

             result = new Parameters(value);

         } else {

             result = new Parameters();

         }

         filename = p.getXML().get("filename");

     }

     public void process(XMLFragment object) throws IOException {

         result.add(object.nodePath, object.innerText);

     }

     public void close() throws IOException {

         File f = new File(filename);

         String parent = f.getParent();

         // make parent directories

         if (parent != null) {

             new File(parent).mkdirs();

         }

         result.write(filename);

     }

     public static void verify(TupleFlowParameters parameters, ErrorHandler handler) {

         if (!parameters.getXML().containsKey("filename")) {

             handler.addError("ManifestWriter requires a 'filename' parameter.");

             return;

         }

         File f = new File(parameters.getXML().get("filename"));

         if (f.isFile() && f.canWrite()) {

             return; // good news

         }

         if (f.isDirectory()) {

             handler.addError("Pathname " + f.toString() + " exists, and it is a directory, but " +

                     "ManifestWriter would like to write a file there.");

             return;

         }

         // this will search upwards and verify that we can make

         // the necessary directory structure to store this file.

         Verification.requireWriteableFile(f.toString(), handler);

     }

 }