// Copyright 2018 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.causes;

import com.google.common.base.MoreObjects;
import com.google.devtools.build.lib.buildeventstream.BuildEventStreamProtos;
import com.google.devtools.build.lib.cmdline.Label;
import java.util.Objects;

/** Failure due to something associated with a label; also adds a message. */
public class LabelCause implements Cause {
  private final Label label;
  private final String msg;

  public LabelCause(Label label, String msg) {
    this.label = label;
    this.msg = msg;
  }

  @Override
  public String toString() {
    return MoreObjects.toStringHelper(this)
        .add("label", label)
        .add("msg", msg)
        .toString();
  }

  @Override
  public Label getLabel() {
    return label;
  }

  @Override
  public BuildEventStreamProtos.BuildEventId getIdProto() {
    return BuildEventStreamProtos.BuildEventId.newBuilder()
        .setUnconfiguredLabel(
            BuildEventStreamProtos.BuildEventId.UnconfiguredLabelId.newBuilder()
                .setLabel(label.toString())
                .build())
        .build();
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    } else if (!(o instanceof LabelCause)) {
      return false;
    }
    LabelCause a = (LabelCause) o;
    return label.equals(a.label) && msg.equals(a.msg);
  }

  @Override
  public int hashCode() {
    return Objects.hash(label, msg);
  }
}