com.ricemap.spateDB.util.ImageOutputFormat.java Source code

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Here is the source code for com.ricemap.spateDB.util.ImageOutputFormat.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the
 * NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF
 * licenses this file to you 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.ricemap.spateDB.util;

import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;

import javax.imageio.ImageIO;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordWriter;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.util.Progressable;

import com.ricemap.spateDB.core.SpatialSite;
import com.ricemap.spateDB.shape.Prism;

/**
 * An output format that is used to plot ImageWritable to PNG image.
 * @author tonyren, Ahmed Eldawy
 *
 */
public class ImageOutputFormat extends FileOutputFormat<Prism, ImageWritable> {
    /**MBR of the input file*/
    private static final String InputFileMBR = "plot.file_mbr";

    /**Configuration line for image width*/
    private static final String ImageWidth = "plot.image_width";

    /**Configuration line for image height*/
    private static final String ImageHeight = "plot.image_height";

    /**Used to indicate the progress*/
    private Progressable progress;

    class ImageRecordWriter implements RecordWriter<Prism, ImageWritable> {

        private final FileSystem outFs;
        private final Path out;
        private final int image_width;
        private final Prism fileMbr;
        private final int image_height;

        private BufferedImage image;

        ImageRecordWriter(Path out, FileSystem outFs, int width, int height, Prism fileMbr) {
            System.setProperty("java.awt.headless", "true");
            this.out = out;
            this.outFs = outFs;
            this.image_width = width;
            this.image_height = height;
            this.fileMbr = fileMbr;
            this.image = new BufferedImage(image_width, image_height, BufferedImage.TYPE_INT_ARGB);
        }

        @Override
        public void write(Prism cell, ImageWritable value) throws IOException {
            progress.progress();
            int tile_x = (int) ((cell.x1 - fileMbr.x1) * image_width / (fileMbr.x2 - fileMbr.x1));
            int tile_y = (int) ((cell.y1 - fileMbr.y1) * image_height / (fileMbr.y2 - fileMbr.y1));
            Graphics2D graphics;
            try {
                graphics = image.createGraphics();
            } catch (Throwable e) {
                graphics = new SimpleGraphics(image);
            }
            graphics.drawImage(value.getImage(), tile_x, tile_y, null);
            graphics.dispose();
        }

        @Override
        public void close(Reporter reporter) throws IOException {
            OutputStream output = outFs.create(out);
            ImageIO.write(image, "png", output);
            output.close();
        }
    }

    @Override
    public RecordWriter<Prism, ImageWritable> getRecordWriter(FileSystem ignored, JobConf job, String name,
            Progressable progress) throws IOException {
        this.progress = progress;
        Path file = FileOutputFormat.getTaskOutputPath(job, name);
        FileSystem fs = file.getFileSystem(job);
        Prism fileMbr = getFileMBR(job);
        int imageWidth = getImageWidth(job);
        int imageHeight = getImageHeight(job);

        return new ImageRecordWriter(file, fs, imageWidth, imageHeight, fileMbr);
    }

    public static void setImageWidth(Configuration conf, int width) {
        conf.setInt(ImageWidth, width);
    }

    public static void setImageHeight(Configuration conf, int height) {
        conf.setInt(ImageHeight, height);
    }

    public static void setFileMBR(Configuration conf, Prism mbr) {
        SpatialSite.setShape(conf, InputFileMBR, mbr);
    }

    public static int getImageWidth(Configuration conf) {
        return conf.getInt(ImageWidth, 1000);
    }

    public static int getImageHeight(Configuration conf) {
        return conf.getInt(ImageHeight, 1000);
    }

    public static Prism getFileMBR(Configuration conf) {
        return (Prism) SpatialSite.getShape(conf, InputFileMBR);
    }
}