org.callimachusproject.fluid.consumers.HttpEntityWriter.java Source code

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Here is the source code for org.callimachusproject.fluid.consumers.HttpEntityWriter.java

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/*
 * Copyright (c) 2013 3 Round Stones Inc., Some Rights Reserved
 *
 * 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.callimachusproject.fluid.consumers;

import java.io.IOException;
import java.nio.channels.ReadableByteChannel;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.stream.XMLStreamException;
import javax.xml.transform.TransformerException;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.util.EntityUtils;
import org.callimachusproject.fluid.Consumer;
import org.callimachusproject.fluid.Fluid;
import org.callimachusproject.fluid.FluidBuilder;
import org.callimachusproject.fluid.FluidType;
import org.callimachusproject.fluid.Vapor;
import org.callimachusproject.io.ChannelUtil;
import org.openrdf.OpenRDFException;

public class HttpEntityWriter implements Consumer<HttpEntity> {

    public boolean isConsumable(FluidType mtype, FluidBuilder builder) {
        return HttpEntity.class.isAssignableFrom(mtype.asClass());
    }

    public Fluid consume(final HttpEntity result, final String base, final FluidType ftype,
            final FluidBuilder builder) {
        return new Vapor() {
            public String getSystemId() {
                return base;
            }

            public FluidType getFluidType() {
                return ftype;
            }

            public void asVoid() throws IOException {
                if (result != null) {
                    EntityUtils.consume(result);
                }
            }

            @Override
            protected String toHttpEntityMedia(FluidType media) {
                if (result == null)
                    return ftype.as(media).preferred();
                Header hd = result.getContentType();
                if (hd == null)
                    return ftype.as(media).preferred();
                return ftype.as(hd.getValue()).as(media).preferred();
            }

            @Override
            protected HttpEntity asHttpEntity(FluidType media) throws Exception {
                if (result == null)
                    return null;
                return result;
            }

            @Override
            protected String toChannelMedia(FluidType media) {
                if (result == null)
                    return ftype.as(media).preferred();
                Header hd = result.getContentType();
                if (hd == null)
                    return ftype.as(media).preferred();
                return ftype.as(hd.getValue()).as(media).preferred();
            }

            @Override
            protected ReadableByteChannel asChannel(FluidType media) throws IOException, OpenRDFException,
                    XMLStreamException, TransformerException, ParserConfigurationException {
                if (result == null)
                    return null;
                return ChannelUtil.newChannel(result.getContent());
            }

            public String toString() {
                return String.valueOf(result);
            }
        };
    }

}