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package org.glassfish.jersey.message;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

import javax.annotation.Priority;
import javax.ws.rs.Priorities;
import javax.ws.rs.core.HttpHeaders;

import org.glassfish.jersey.spi.ContentEncoder;

/**
 * GZIP encoding support. Interceptor that encodes the output or decodes the input if
 * {@link HttpHeaders#CONTENT_ENCODING Content-Encoding header} value equals to {@code gzip} or {@code x-gzip}.
 *
 * @author Martin Matula
 */
@Priority(Priorities.ENTITY_CODER)
public class GZipEncoder extends ContentEncoder {
    /**
     * Initialize GZipEncoder.
     */
    public GZipEncoder() {
        super("gzip", "x-gzip");
    }

    @Override
    public InputStream decode(String contentEncoding, InputStream encodedStream)
            throws IOException {
        return new GZIPInputStream(encodedStream);
    }

    @Override
    public OutputStream encode(String contentEncoding, OutputStream entityStream)
            throws IOException {
        return new GZIPOutputStream(entityStream);
    }
}