net.derquinse.common.jaxrs.ByteSourceBodyWriter.java Source code

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Here is the source code for net.derquinse.common.jaxrs.ByteSourceBodyWriter.java

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/*
 * Copyright (C) the original author or authors.
 *
 * 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.derquinse.common.jaxrs;

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

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

import net.derquinse.common.io.MemoryByteSource;

import com.google.common.io.ByteSource;

/**
 * {@link ByteSource} message body writer.
 * @author Andres Rodriguez.
 */
@Provider
public final class ByteSourceBodyWriter implements MessageBodyWriter<ByteSource> {
    /** Default constructor. */
    public ByteSourceBodyWriter() {
    }

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

    @Override
    public long getSize(ByteSource t, Class<?> type, Type genericType, Annotation[] annotations,
            MediaType mediaType) {
        if (t instanceof MemoryByteSource) {
            return ((MemoryByteSource) t).size();
        }
        return -1;
    }

    @Override
    public void writeTo(ByteSource t, Class<?> type, Type genericType, Annotation[] annotations,
            MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream)
            throws IOException, WebApplicationException {
        t.copyTo(entityStream);
    }
}