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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.
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/*
 * ====================================================================
 * 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
 * .
 *
 */

package com.feilong.lib.org.apache.http.entity;

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

import com.feilong.lib.org.apache.http.impl.io.EmptyInputStream;
import com.feilong.lib.org.apache.http.util.Args;
import com.feilong.lib.org.apache.http.util.Asserts;

/**
 * A generic streamed, non-repeatable entity that obtains its content
 * from an {@link InputStream}.
 *
 * @since 4.0
 */
public class BasicHttpEntity extends AbstractHttpEntity{

    private InputStream content;

    private long        length;

    /**
     * Creates a new basic entity.
     * The content is initially missing, the content length
     * is set to a negative number.
     */
    public BasicHttpEntity(){
        super();
        this.length = -1;
    }

    @Override
    public long getContentLength(){
        return this.length;
    }

    /**
     * Obtains the content, once only.
     *
     * @return the content, if this is the first call to this method
     *         since {@link #setContent setContent} has been called
     *
     * @throws IllegalStateException
     *             if the content has not been provided
     */
    @Override
    public InputStream getContent() throws IllegalStateException{
        Asserts.check(this.content != null, "Content has not been provided");
        return this.content;
    }

    /**
     * Tells that this entity is not repeatable.
     *
     * @return {@code false}
     */
    @Override
    public boolean isRepeatable(){
        return false;
    }

    /**
     * Specifies the length of the content.
     *
     * @param len
     *            the number of bytes in the content, or
     *            a negative number to indicate an unknown length
     */
    public void setContentLength(final long len){
        this.length = len;
    }

    /**
     * Specifies the content.
     *
     * @param inStream
     *            the stream to return with the next call to
     *            {@link #getContent getContent}
     */
    public void setContent(final InputStream inStream){
        this.content = inStream;
    }

    @Override
    public void writeTo(final OutputStream outStream) throws IOException{
        Args.notNull(outStream, "Output stream");
        final InputStream inStream = getContent();
        try{
            int l;
            final byte[] tmp = new byte[OUTPUT_BUFFER_SIZE];
            while ((l = inStream.read(tmp)) != -1){
                outStream.write(tmp, 0, l);
            }
        }finally{
            inStream.close();
        }
    }

    @Override
    public boolean isStreaming(){
        return this.content != null && this.content != EmptyInputStream.INSTANCE;
    }

}