src/main/java/com/google/devtools/build/lib/actions/LostInputsExecException.java

// 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.actions;

import com.google.common.collect.ImmutableList;

/**
 * An {@link ExecException} thrown when an action fails to execute because one or more of its inputs
 * was lost. In some cases, Bazel may know how to fix this on its own.
 */
public class LostInputsExecException extends ExecException {

  private final ImmutableList<ActionInput> lostInputs;

  public LostInputsExecException(ImmutableList<ActionInput> lostInputs) {
    super("");
    this.lostInputs = lostInputs;
  }

  private ImmutableList<ActionInput> getLostInputs() {
    return lostInputs;
  }

  @Override
  public ActionExecutionException toActionExecutionException(
      String messagePrefix, boolean verboseFailures, Action action) {
    String message = messagePrefix + " failed";
    return new LostInputsActionExecutionException(message, this, action);
  }

  /** An {@link ActionExecutionException} wrapping a {@link LostInputsExecException}. */
  public static class LostInputsActionExecutionException extends ActionExecutionException {

    private LostInputsActionExecutionException(
        String message, LostInputsExecException cause, Action action) {
      super(message, cause, action, /*catastrophe=*/ false);
    }

    public ImmutableList<ActionInput> getLostInputs() {
      return ((LostInputsExecException) getCause()).getLostInputs();
    }
  }
}