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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 opennlp.perceptron;

import java.io.BufferedWriter;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.util.zip.GZIPOutputStream;

import opennlp.model.AbstractModel;
import opennlp.model.AbstractModelWriter;

/**
 * A writer for GIS models which inspects the filename and invokes the
 * appropriate GISModelWriter depending on the filename's suffixes.
 *
 * The following assumption are made about suffixes:
 *    
.gz  --> the file is gzipped (must be the last suffix)
 *    
.txt --> the file is plain text
 *    .bin --> the file is binary
 */
public class SuffixSensitivePerceptronModelWriter extends PerceptronModelWriter {
    private final AbstractModelWriter suffixAppropriateWriter;

    /**
     * Constructor which takes a GISModel and a File and invokes the
     * GISModelWriter appropriate for the suffix.
     *
     * @param model The GISModel which is to be persisted.
     * @param f The File in which the model is to be stored.
     */
    public SuffixSensitivePerceptronModelWriter (AbstractModel model, File f)
	throws IOException {

	super (model);
	
	OutputStream output;
	String filename = f.getName();

	// handle the zipped/not zipped distinction
	if (filename.endsWith(".gz")) {
	    output = new GZIPOutputStream(new FileOutputStream(f));
	    filename = filename.substring(0,filename.length()-3);
	}
	else {
	    output = new DataOutputStream(new FileOutputStream(f));
	}

	// handle the different formats
	if (filename.endsWith(".bin")) {
	    suffixAppropriateWriter =
		new BinaryPerceptronModelWriter(model,
					 new DataOutputStream(output));
	}
	else { // default is ".txt"
	    suffixAppropriateWriter =
		new PlainTextPerceptronModelWriter(model,
		    new BufferedWriter(new OutputStreamWriter(output)));
	}    
    }

    public void writeUTF (String s) throws java.io.IOException {
      suffixAppropriateWriter.writeUTF(s);
    }

    public void writeInt (int i) throws java.io.IOException {
      suffixAppropriateWriter.writeInt(i);
    }
    
    public void writeDouble (double d) throws java.io.IOException {
      suffixAppropriateWriter.writeDouble(d);
    }

    public void close () throws java.io.IOException {
      suffixAppropriateWriter.close();
    }

}