net.netheos.pcsapi.request.ByteSourceEntity.java Source code

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Here is the source code for net.netheos.pcsapi.request.ByteSourceEntity.java

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/**
 * Copyright (c) 2014 Netheos (http://www.netheos.net)
 *
 * 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 net.netheos.pcsapi.request;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import net.netheos.pcsapi.bytesio.ByteSource;
import net.netheos.pcsapi.utils.PcsUtils;
import org.apache.http.entity.AbstractHttpEntity;

/**
 * Adapter class to represent a byte source as an http entity (for uploads).
 */
public class ByteSourceEntity extends AbstractHttpEntity {

    private final ByteSource byteSource;
    private InputStream currentStream;

    public ByteSourceEntity(ByteSource bs) {
        super();
        this.byteSource = bs;
        setContentType((String) null);
        setContentEncoding((String) null);
        setChunked(false);
    }

    @Override
    public boolean isRepeatable() {
        return true;
    }

    @Override
    public long getContentLength() {
        return byteSource.length();
    }

    @Override
    public InputStream getContent() throws IOException, IllegalStateException {
        if (currentStream != null) { // should never happen
            // defensive code : we close any opened stream
            PcsUtils.closeQuietly(currentStream);
        }
        currentStream = byteSource.openStream();
        return currentStream;
    }

    @Override
    public void writeTo(OutputStream outstream) throws IOException {
        if (outstream == null) {
            throw new IllegalArgumentException("Output stream may not be null");
        }
        InputStream instream = getContent();
        try {
            byte[] buffer = new byte[4096];
            int n;
            while ((n = instream.read(buffer)) != -1) {
                outstream.write(buffer, 0, n);
            }
        } finally {
            PcsUtils.closeQuietly(instream);
            consumeContent();
        }
    }

    @Override
    public boolean isStreaming() {
        return false;
    }

    @Override
    public void consumeContent() throws IOException {
        if (currentStream != null) {
            PcsUtils.closeQuietly(currentStream);
            currentStream = null;
        }
    }

}