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/*
 * Copyright 2013, 2014 Deutsche Nationalbibliothek
 *
 * 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.metafacture.triples;

import org.metafacture.framework.FluxCommand;
import org.metafacture.framework.MetafactureException;
import org.metafacture.framework.ObjectReceiver;
import org.metafacture.framework.annotations.Description;
import org.metafacture.framework.annotations.In;
import org.metafacture.framework.annotations.Out;
import org.metafacture.framework.helpers.DefaultObjectPipe;
import org.metafacture.framework.objects.Triple;

import java.io.BufferedInputStream;
import java.io.EOFException;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;

/**
 * Reads triples.
 *
 * @author Christoph Böhme
 *
 */
@Description("Reads triples")
@In(String.class)
@Out(Triple.class)
@FluxCommand("read-triples")
public final class TripleReader extends DefaultObjectPipe> {

    public static final int BUFFERSIZE = 2048;

    /**
     * Creates an instance of {@link TripleReader}.
     */
    public TripleReader() {
    }

    @Override
    public void process(final String filename) {
        try {
            final ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(new FileInputStream(filename), BUFFERSIZE));

            try {
                while (true) {
                    getReceiver().process(Triple.read(in));
                }
            }
            catch (final EOFException e) {
            }
            finally {
                in.close();
            }
        }
        catch (final IOException e) {
            throw new MetafactureException(e);
        }
    }

}