src/com/facebook/buck/util/CapturingPrintStream.java

/*
 * Copyright 2012-present Facebook, Inc.
 *
 * 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 com.facebook.buck.util;

import com.google.common.base.Throwables;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;

public class CapturingPrintStream extends PrintStream {

  private final ByteArrayOutputStream byteArrayOutputStream;

  public CapturingPrintStream() {
    this(new ByteArrayOutputStream());
  }

  private CapturingPrintStream(ByteArrayOutputStream byteArrayOutputStream) {
    super(byteArrayOutputStream);
    this.byteArrayOutputStream = byteArrayOutputStream;
  }

  public String getContentsAsString(Charset charset) {
    try {
      return byteArrayOutputStream.toString(charset.name());
    } catch (UnsupportedEncodingException e) {
      throw Throwables.propagate(e);
    }
  }
}