GrepJSONBuilder.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.match;

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;

/** Generates the final report file for grepdata, placing the data in outfile.
 * Be warned, the final output report may be difficult to actually open for
 * inspection, as the data is located in a single, very long JSON string line,
 * which many unix text editors may not like.
 */
public class GrepJSONBuilder {
    
    public static void buildReport(Path countReport, Path matchReport, Path outFile)
    throws IOException {
        
        FSDataOutputStream out = FileSystem.get(new Configuration()).create(outFile, true);
        out.write("var keywordCounts = ".getBytes());
        writeFileToStream(countReport, out);
        out.write("\n\nvar searchHits = ".getBytes());
        writeFileToStream(matchReport, out);
        out.flush();
        out.close();

    }
    
    public 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);
        }
    }
}