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Java example source code file (EntityEnclosingRequestWrapper.java)

This example source code file (EntityEnclosingRequestWrapper.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

entityenclosingrequestwrapper, entitywrapper, header, httpentity, httpentityenclosingrequest, httpentitywrapper, inputstream, io, ioexception, notthreadsafe, outputstream, override, protocolexception

The EntityEnclosingRequestWrapper.java example source code

/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.http.impl.client;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.http.annotation.NotThreadSafe;
import org.apache.http.entity.HttpEntityWrapper;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.ProtocolException;
import org.apache.http.protocol.HTTP;

/**
 * A wrapper class for {@link HttpEntityEnclosingRequest}s that can 
 * be used to change properties of the current request without 
 * modifying the original object.
 * </p>
 * This class is also capable of resetting the request headers to
 * the state of the original request.
 *
 *
 * @since 4.0
 */
@NotThreadSafe // e.g. [gs]etEntity()
public class EntityEnclosingRequestWrapper extends RequestWrapper 
    implements HttpEntityEnclosingRequest {
    
    private HttpEntity entity;
    private boolean consumed;
    
    public EntityEnclosingRequestWrapper(final HttpEntityEnclosingRequest request)
        throws ProtocolException {
        super(request);
        setEntity(request.getEntity());
    }

    public HttpEntity getEntity() {
        return this.entity;
    }

    public void setEntity(final HttpEntity entity) {
        this.entity = entity != null ? new EntityWrapper(entity) : null;
        this.consumed = false;
    }
    
    public boolean expectContinue() {
        Header expect = getFirstHeader(HTTP.EXPECT_DIRECTIVE);
        return expect != null && HTTP.EXPECT_CONTINUE.equalsIgnoreCase(expect.getValue());
    }

    @Override
    public boolean isRepeatable() {
        return this.entity == null || this.entity.isRepeatable() || !this.consumed;
    }
    
    class EntityWrapper extends HttpEntityWrapper {
        
        EntityWrapper(final HttpEntity entity) {
            super(entity);
        }

        @Override
        public void consumeContent() throws IOException {
            consumed = true;
            super.consumeContent();
        }

        @Override
        public InputStream getContent() throws IOException {
            consumed = true;
            return super.getContent();
        }

        @Override
        public void writeTo(final OutputStream outstream) throws IOException {
            consumed = true;
            super.writeTo(outstream);
        }
        
    }
    
}

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