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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 org.apache.http.entity;

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

import org.apache.http.util.Args;

/**
 * Entity that delegates the process of content generation
 * to a {@link ContentProducer}.
 *
 * @since 4.0
 */
public class EntityTemplate extends AbstractHttpEntity {

    private final ContentProducer contentproducer;

    public EntityTemplate(final ContentProducer contentproducer) {
        super();
        this.contentproducer = Args.notNull(contentproducer, "Content producer");
    }

    @Override
    public long getContentLength() {
        return -1;
    }

    @Override
    public InputStream getContent() throws IOException {
        final ByteArrayOutputStream buf = new ByteArrayOutputStream();
        writeTo(buf);
        return new ByteArrayInputStream(buf.toByteArray());
    }

    @Override
    public boolean isRepeatable() {
        return true;
    }

    @Override
    public void writeTo(final OutputStream outStream) throws IOException {
        Args.notNull(outStream, "Output stream");
        this.contentproducer.writeTo(outStream);
    }

    @Override
    public boolean isStreaming() {
        return false;
    }

}