/*
    * ====================================================================
    * 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.hc.core5.http.nio.entity;
  
  import java.io.IOException;
  import java.nio.CharBuffer;
  
  import org.apache.hc.core5.http.ContentType;
  import org.apache.hc.core5.http.HttpException;
  import org.apache.hc.core5.http.config.CharCodingConfig;
  import org.apache.hc.core5.util.Args;
  import org.apache.hc.core5.util.CharArrayBuffer;
  
  /**
   * Basic {@link org.apache.hc.core5.http.nio.AsyncEntityConsumer} implementation
   * that processes the data stream content into a string.
   *
   * @since 5.0
   */
  public class StringAsyncEntityConsumer extends AbstractCharAsyncEntityConsumer<String> {
  
      private final int capacityIncrement;
      private final CharArrayBuffer content;
  
      public StringAsyncEntityConsumer(final int bufSize, final int capacityIncrement, final CharCodingConfig charCodingConfig) {
          super(bufSize, charCodingConfig);
          this.capacityIncrement = Args.positive(capacityIncrement, "Capacity increment");
          this.content = new CharArrayBuffer(1024);
      }
  
      public StringAsyncEntityConsumer(final int capacityIncrement) {
          this(DEF_BUF_SIZE, capacityIncrement, CharCodingConfig.DEFAULT);
      }
  
      public StringAsyncEntityConsumer(final CharCodingConfig charCodingConfig) {
          this(DEF_BUF_SIZE, Integer.MAX_VALUE, charCodingConfig);
      }
  
      public StringAsyncEntityConsumer() {
          this(Integer.MAX_VALUE);
      }
  
      @Override
      protected final void streamStart(final ContentType contentType) throws HttpException, IOException {
      }
  
      @Override
      protected int capacityIncrement() {
          return capacityIncrement;
      }
  
      @Override
      protected final void data(final CharBuffer src, final boolean endOfStream) {
          Args.notNull(src, "CharBuffer");
          final int chunk = src.remaining();
          content.ensureCapacity(chunk);
          src.get(content.array(), content.length(), chunk);
          content.setLength(content.length() + chunk);
      }
  
      @Override
      public String generateContent() {
          return content.toString();
      }
  
      @Override
      public void releaseResources() {
          content.clear();
      }
  
  }