/*
 * Copyright 2002-2015 the original author or authors.
 *
 * Licensed 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.
 */

package org.teiid.spring.data.rest;

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

import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.util.StreamUtils;

/**
 * Simple implementation of {@link ClientHttpResponse} that reads the response's body
 * into memory, thus allowing for multiple invocations of {@link #getBody()}.
 *
 * @author Arjen Poutsma
 * @since 3.1
 */
final class BufferingClientHttpResponseWrapper implements ClientHttpResponse {

  private final ClientHttpResponse response;

  private byte[] body;


  BufferingClientHttpResponseWrapper(ClientHttpResponse response) {
    this.response = response;
  }


  @Override
  public HttpStatus getStatusCode() throws IOException {
    return this.response.getStatusCode();
  }

  @Override
  public int getRawStatusCode() throws IOException {
    return this.response.getRawStatusCode();
  }

  @Override
  public String getStatusText() throws IOException {
    return this.response.getStatusText();
  }

  @Override
  public HttpHeaders getHeaders() {
    return this.response.getHeaders();
  }

  @Override
  public InputStream getBody() throws IOException {
    if (this.body == null) {
      this.body = StreamUtils.copyToByteArray(this.response.getBody());
    }
    return new ByteArrayInputStream(this.body);
  }

  @Override
  public void close() {
    this.response.close();
  }

}
