test/com/facebook/buck/util/FakeProcess.java

/*
 * Copyright 2014-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.Charsets;
import com.google.common.base.Preconditions;

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

/**
 * Fake implementation of {@link java.lang.Process}.
 */
public class FakeProcess extends Process {
  private final int exitValue;
  private final OutputStream outputStream;
  private final ByteArrayOutputStream outputMirror;
  private final InputStream inputStream;
  private final InputStream errorStream;
  private boolean isDestroyed;
  private boolean isWaitedFor;

  public FakeProcess(int exitValue) {
    this(exitValue, "", "");
  }

  public FakeProcess(
      int exitValue,
      String stdout,
      String stderr) {
    this(
        exitValue,
        new ByteArrayOutputStream(),
        new ByteArrayInputStream(Preconditions.checkNotNull(stdout).getBytes(Charsets.UTF_8)),
        new ByteArrayInputStream(Preconditions.checkNotNull(stderr).getBytes(Charsets.UTF_8)));
  }

  public FakeProcess(
      int exitValue,
      OutputStream outputStream,
      InputStream inputStream,
      InputStream errorStream) {
    this.exitValue = exitValue;
    this.outputStream = Preconditions.checkNotNull(outputStream);
    this.outputMirror = new ByteArrayOutputStream();
    this.inputStream = Preconditions.checkNotNull(inputStream);
    this.errorStream = Preconditions.checkNotNull(errorStream);
  }

  @Override
  public void destroy() {
    isDestroyed = true;
  }

  @Override
  public int exitValue() {
    return exitValue;
  }

  @Override
  public OutputStream getOutputStream() {
    return new OutputStream() {
      @Override
      public void write(int b) throws IOException {
        outputStream.write(b);
        outputMirror.write(b);
      }

      @Override
      public void flush() throws IOException {
        outputStream.flush();
        outputMirror.flush();
      }

      @Override
      public void close() throws IOException {
        outputStream.close();
        outputMirror.close();
      }
    };
  }

  @Override
  public InputStream getInputStream() {
    return inputStream;
  }

  @Override
  public InputStream getErrorStream() {
    return errorStream;
  }

  @Override
  public int waitFor() {
    isWaitedFor = true;
    return exitValue;
  }

  /**
   * Returns true if {@link #destroy()} was called on this object, false otherwise.
   */
  public boolean isDestroyed() {
    return isDestroyed;
  }

  /**
   * Returns true if {@link #waitFor()} was called on this object, false otherwise.
   */
  public boolean isWaitedFor() {
    return isWaitedFor;
  }

  /**
   * Returns what has been written to {@link #getOutputStream()} so far.
   */
  public String getOutput() {
    return outputMirror.toString();
  }
}