001/* 002 * ==================================================================== 003 * Licensed to the Apache Software Foundation (ASF) under one 004 * or more contributor license agreements. See the NOTICE file 005 * distributed with this work for additional information 006 * regarding copyright ownership. The ASF licenses this file 007 * to you under the Apache License, Version 2.0 (the 008 * "License"); you may not use this file except in compliance 009 * with the License. You may obtain a copy of the License at 010 * 011 * http://www.apache.org/licenses/LICENSE-2.0 012 * 013 * Unless required by applicable law or agreed to in writing, 014 * software distributed under the License is distributed on an 015 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 016 * KIND, either express or implied. See the License for the 017 * specific language governing permissions and limitations 018 * under the License. 019 * ==================================================================== 020 * 021 * This software consists of voluntary contributions made by many 022 * individuals on behalf of the Apache Software Foundation. For more 023 * information on the Apache Software Foundation, please see 024 * <http://www.apache.org/>. 025 * 026 */ 027 028package org.apache.http.entity; 029 030import java.io.ByteArrayInputStream; 031import java.io.ByteArrayOutputStream; 032import java.io.IOException; 033import java.io.InputStream; 034import java.io.OutputStream; 035 036import org.apache.http.util.Args; 037 038/** 039 * Entity that delegates the process of content generation 040 * to a {@link ContentProducer}. 041 * 042 * @since 4.0 043 */ 044public class EntityTemplate extends AbstractHttpEntity { 045 046 private final ContentProducer contentproducer; 047 048 public EntityTemplate(final ContentProducer contentproducer) { 049 super(); 050 this.contentproducer = Args.notNull(contentproducer, "Content producer"); 051 } 052 053 @Override 054 public long getContentLength() { 055 return -1; 056 } 057 058 @Override 059 public InputStream getContent() throws IOException { 060 final ByteArrayOutputStream buf = new ByteArrayOutputStream(); 061 writeTo(buf); 062 return new ByteArrayInputStream(buf.toByteArray()); 063 } 064 065 @Override 066 public boolean isRepeatable() { 067 return true; 068 } 069 070 @Override 071 public void writeTo(final OutputStream outstream) throws IOException { 072 Args.notNull(outstream, "Output stream"); 073 this.contentproducer.writeTo(outstream); 074 } 075 076 @Override 077 public boolean isStreaming() { 078 return false; 079 } 080 081}