ClusterJSONBuilder.java

/*
   Copyright 2011 Basis Technology Corp.

   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.sleuthkit.hadoop.clustering;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

/** Concatenates file data generated from the clustering step into an output report. */
public class ClusterJSONBuilder {

    public static void buildReport(Path countReport, Path clusterReport, Path outFile)
    throws IOException {
        FSDataOutputStream out = FileSystem.get(new Configuration()).create(outFile, true);
        out.write("var docClusterCounts = ".getBytes());
        writeFileToStream(countReport, out);
        out.write("\n\nvar docClusters = ".getBytes());
        writeFileToStream(clusterReport, out);
        out.flush();
        out.close();
    }

    private static void writeFileToStream(Path path, FSDataOutputStream stream) throws IOException {
        FileSystem fs = FileSystem.get(new Configuration());

        FSDataInputStream in = fs.open(path);

        byte[] bytes = new byte[1024];
        int i = in.read(bytes);
        while ( i != -1) {
            stream.write(bytes, 0, i);
            i = in.read(bytes);
        }
    }
}