org.callimachusproject.rewrite.ProxyPostAdvice.java Source code

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Here is the source code for org.callimachusproject.rewrite.ProxyPostAdvice.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.rewrite;

import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;

import javax.tools.FileObject;

import org.apache.http.Header;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.callimachusproject.annotations.type;
import org.callimachusproject.client.StreamEntity;
import org.callimachusproject.fluid.Fluid;
import org.callimachusproject.fluid.FluidBuilder;
import org.callimachusproject.fluid.FluidException;
import org.callimachusproject.fluid.FluidType;
import org.openrdf.annotations.Iri;
import org.openrdf.repository.object.traits.ObjectMessage;

public class ProxyPostAdvice extends ProxyGetAdvice {
    private final Map<Method, Integer> bodyIndices = new HashMap<Method, Integer>(1);
    private String bodyIri;
    private FluidType bodyFluidType;

    public ProxyPostAdvice(String[] bindingNames, FluidType[] bindingTypes, Substitution[] replacers,
            Method method) {
        super(bindingNames, bindingTypes, replacers, method);
        Annotation[][] panns = method.getParameterAnnotations();
        Type[] gtypes = method.getGenericParameterTypes();
        for (int i = 0; i < panns.length; i++) {
            if (bindingNames[i] == null) {
                for (Annotation ann : panns[i]) {
                    if (ann instanceof type) {
                        bodyIndices.put(method, i);
                        String[] media = ((type) ann).value();
                        bodyFluidType = new FluidType(gtypes[i], media);
                        for (Annotation bann : panns[i]) {
                            if (bann instanceof Iri) {
                                bodyIri = ((Iri) bann).value();
                            }
                        }
                    }
                }
            }
        }
    }

    protected HttpUriRequest createRequest(String location, Header[] headers, ObjectMessage message,
            FluidBuilder fb) throws IOException, FluidException {
        Object target = message.getTarget();
        Integer bodyIndex = getBodyIndex(message.getMethod());
        if (bodyIndex == null && target instanceof FileObject && contains(headers, "Content-Type")) {
            FileObject file = (FileObject) target;
            InputStream in = file.openInputStream();
            if (in != null) {
                HttpPost req = new HttpPost(location);
                req.setHeaders(headers);
                if (!contains(headers, "Content-Location")) {
                    String uri = file.toUri().toASCIIString();
                    req.setHeader("Content-Location", uri);
                }
                req.setEntity(new StreamEntity(in));
                return req;
            }
        }
        if (bodyIndex == null) {
            HttpPost req = new HttpPost(location);
            req.setHeaders(headers);
            return req;
        }
        HttpPost req = new HttpPost(location);
        req.setHeaders(headers);
        Object body = message.getParameters()[bodyIndex];
        Fluid fluid = fb.consume(body, getSystemId(), bodyFluidType);
        req.setEntity(fluid.asHttpEntity());
        return req;
    }

    private synchronized Integer getBodyIndex(Method method) {
        if (bodyFluidType == null)
            return null;
        Integer ret = bodyIndices.get(method);
        if (ret != null)
            return ret;
        Annotation[][] panns = method.getParameterAnnotations();
        for (int i = panns.length - 1; i >= 0; i--) {
            for (Annotation ann : panns[i]) {
                if (ann instanceof Iri) {
                    if (((Iri) ann).value().equals(bodyIri)) {
                        bodyIndices.put(method, i);
                        return i;
                    }
                }
            }
        }
        return null;
    }

    private boolean contains(Header[] headers, String string) {
        for (Header hd : headers) {
            if (hd.getName().equalsIgnoreCase(string))
                return true;
        }
        return false;
    }

}