org.taverna.server.master.rest.handler.FileConcatenationHandler.java Source code

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Here is the source code for org.taverna.server.master.rest.handler.FileConcatenationHandler.java

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package org.taverna.server.master.rest.handler;
/*
 * 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.
 */

import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;

import org.springframework.beans.factory.annotation.Required;
import org.taverna.server.master.FileConcatenation;
import org.taverna.server.master.exceptions.FilesystemAccessException;
import org.taverna.server.master.interfaces.File;

public class FileConcatenationHandler implements MessageBodyWriter<FileConcatenation> {
    /** How much to pull from the worker in one read. */
    private int maxChunkSize;

    /**
     * @param maxChunkSize
     *            How much to pull from the worker in one read.
     */
    @Required
    public void setMaxChunkSize(int maxChunkSize) {
        this.maxChunkSize = maxChunkSize;
    }

    @Override
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return type.isAssignableFrom(FileConcatenation.class);
    }

    @Override
    public long getSize(FileConcatenation fc, Class<?> type, Type genericType, Annotation[] annotations,
            MediaType mediaType) {
        return fc.size();
    }

    @Override
    public void writeTo(FileConcatenation fc, Class<?> type, Type genericType, Annotation[] annotations,
            MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream)
            throws IOException {
        for (File f : fc)
            try {
                byte[] buffer;
                for (int off = 0; true; off += buffer.length) {
                    buffer = f.getContents(off, maxChunkSize);
                    if (buffer == null || buffer.length == 0)
                        break;
                    entityStream.write(buffer);
                }
            } catch (FilesystemAccessException e) {
                // Ignore/skip to next file
            }
    }
}