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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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.google.devtools.build.lib.buildtool;

import com.google.common.base.MoreObjects;
import com.google.common.base.Preconditions;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.config.BuildConfigurationCollection;
import com.google.devtools.build.lib.util.ExitCode;

import java.util.Collection;
import java.util.Collections;

import javax.annotation.Nullable;

/**
 * Contains information about the result of a build. While BuildRequest is immutable, this class is
 * mutable.
 */
public final class BuildResult {
  private long startTimeMillis = 0; // milliseconds since UNIX epoch.
  private long stopTimeMillis = 0;

  private Throwable crash = null;
  private boolean catastrophe = false;
  private ExitCode exitCondition = ExitCode.BLAZE_INTERNAL_ERROR;

  private BuildConfigurationCollection configurations;
  private Collection<ConfiguredTarget> actualTargets;
  private Collection<ConfiguredTarget> testTargets;
  private Collection<ConfiguredTarget> successfulTargets;

  public BuildResult(long startTimeMillis) {
    this.startTimeMillis = startTimeMillis;
  }

  /**
   * Record the time (according to System.currentTimeMillis()) at which the
   * service of this request was completed.
   */
  public void setStopTime(long stopTimeMillis) {
    this.stopTimeMillis = stopTimeMillis;
  }

  /**
   * Return the time (according to System.currentTimeMillis()) at which the
   * service of this request was completed.
   */
  public long getStopTime() {
    return stopTimeMillis;
  }

  /**
   * Returns the elapsed time in seconds for the service of this request.  Not
   * defined for requests that have not been serviced.
   */
  public double getElapsedSeconds() {
    if (startTimeMillis == 0 || stopTimeMillis == 0) {
      throw new IllegalStateException("BuildRequest has not been serviced");
    }
    return (stopTimeMillis - startTimeMillis) / 1000.0;
  }

  public void setExitCondition(ExitCode exitCondition) {
    this.exitCondition = exitCondition;
  }

  /**
   * True iff the build request has been successfully completed.
   */
  public boolean getSuccess() {
    return exitCondition == ExitCode.SUCCESS;
  }

  /**
   * Gets the Blaze exit condition.
   */
  public ExitCode getExitCondition() {
    return exitCondition;
  }

  /**
   * Sets the RuntimeException / Error that induced a Blaze crash.
   */
  public void setUnhandledThrowable(Throwable crash) {
    Preconditions.checkState(crash == null ||
        ((crash instanceof RuntimeException) || (crash instanceof Error)));
    this.crash = crash;
  }

  /**
   * Sets a "catastrophe": A build failure severe enough to halt a keep_going build.
   */
  public void setCatastrophe() {
    this.catastrophe = true;
  }

  /**
   * Was the build a "catastrophe": A build failure severe enough to halt a keep_going build.
   */
  public boolean wasCatastrophe() {
    return catastrophe;
  }

  /**
   * Gets the Blaze crash Throwable. Null if Blaze did not crash.
   */
  public Throwable getUnhandledThrowable() {
    return crash;
  }

  public void setBuildConfigurationCollection(BuildConfigurationCollection configurations) {
    this.configurations = configurations;
  }

  /**
   * Returns the build configuration collection used for the build.
   */
  public BuildConfigurationCollection getBuildConfigurationCollection() {
    return configurations;
  }

  /**
   * @see #getActualTargets
   */
  public void setActualTargets(Collection<ConfiguredTarget> actualTargets) {
    this.actualTargets = actualTargets;
  }

  /**
   * Returns the actual set of targets which we attempted to build.  This value
   * is set during the build, after the target patterns have been parsed and
   * resolved.  If --keep_going is specified, this set may exclude targets that
   * could not be found or successfully analyzed.  It may be examined after the
   * build.  May be null even after the build, if there were errors in the
   * loading or analysis phases.
   */
  public Collection<ConfiguredTarget> getActualTargets() {
    return actualTargets;
  }

  /**
   * @see #getTestTargets
   */
  public void setTestTargets(@Nullable Collection<ConfiguredTarget> testTargets) {
    this.testTargets = testTargets == null ? null : Collections.unmodifiableCollection(testTargets);
  }

  /**
   * Returns the actual unmodifiable collection of targets which we attempted to
   * test. This value is set at the end of the build analysis phase, after the
   * test target patterns have been parsed and resolved. If --keep_going is
   * specified, this collection may exclude targets that could not be found or
   * successfully analyzed. It may be examined after the build. May be null even
   * after the build, if there were errors in the loading or analysis phases or
   * if testing was not requested.
   */
  public Collection<ConfiguredTarget> getTestTargets() {
    return testTargets;
  }

  /**
   * @see #getSuccessfulTargets
   */
  void setSuccessfulTargets(Collection<ConfiguredTarget> successfulTargets) {
    this.successfulTargets = successfulTargets;
  }

  /**
   * Returns the set of targets which successfully built.  This value
   * is set at the end of the build, after the target patterns have been parsed
   * and resolved and after attempting to build the targets.  If --keep_going
   * is specified, this set may exclude targets that could not be found or
   * successfully analyzed, or could not be built.  It may be examined after
   * the build.  May be null if the execution phase was not attempted, as
   * may happen if there are errors in the loading phase, for example.
   */
  public Collection<ConfiguredTarget> getSuccessfulTargets() {
    return successfulTargets;
  }

  /** For debugging. */
  @Override
  public String toString() {
    return MoreObjects.toStringHelper(this)
        .add("startTimeMillis", startTimeMillis)
        .add("stopTimeMillis", stopTimeMillis)
        .add("crash", crash)
        .add("catastrophe", catastrophe)
        .add("exitCondition", exitCondition)
        .add("actualTargets", actualTargets)
        .add("testTargets", testTargets)
        .add("successfulTargets", successfulTargets)
        .toString();
  }
}