FileWriter.java

/*
 *    Constellation - An open source and standard compliant SDI
 *    http://www.constellation-sdi.org
 *
 * Copyright 2014 Geomatys.
 *
 * 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.constellation.wps.ws.rs;

import org.apache.sis.util.logging.Logging;

import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * A class to manage the file writing operation into request response messages.
 *
 * @author Alexis Manin (Geomatys)
 * Date : 05/02/13
 */
public class FileWriter<T extends File> implements MessageBodyWriter<T> {

    private static final Logger LOGGER = Logging.getLogger("org.constellation.wps.ws.rs");

    @Override
    public boolean isWriteable(final Class<?> type, final Type type1, final Annotation[] antns, final MediaType mt) {
        return File.class.isAssignableFrom(type);
    }

    @Override
    public long getSize(final T t, final Class<?> type, final Type type1, final Annotation[] antns, final MediaType mt) {
        return t.length();
    }

    @Override
    public void writeTo(final T t, final Class<?> type, final Type type1, final Annotation[] antns, final MediaType mt,
            final MultivaluedMap<String, Object> mm, final OutputStream out) throws IOException, WebApplicationException {

        FileInputStream in = new FileInputStream(t);
        try {
            final byte[] buffer = new byte[4096];
            int bytesRead;

            while ((bytesRead = in.read(buffer)) != -1) {
                out.write(buffer, 0, bytesRead); // write
            }
        } finally {
            try {
                in.close();
            } catch (IOException e) {
                LOGGER.log(Level.FINE, e.getLocalizedMessage(), e);
            }
        }
    }
}