| // 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.query2.engine; |
| |
| /** |
| */ |
| public class QueryException extends Exception { |
| |
| /** |
| * Returns a better error message for the query. |
| */ |
| static String describeFailedQuery(QueryException e, QueryExpression toplevel) { |
| QueryExpression badQuery = e.getFailedExpression(); |
| if (badQuery == null) { |
| return "Evaluation failed: " + e.getMessage(); |
| } |
| return badQuery == toplevel |
| ? "Evaluation of query \"" + toplevel + "\" failed: " + e.getMessage() |
| : "Evaluation of subquery \"" + badQuery |
| + "\" failed (did you want to use --keep_going?): " + e.getMessage(); |
| } |
| |
| private final QueryExpression expression; |
| |
| public QueryException(QueryException e, QueryExpression toplevel) { |
| super(describeFailedQuery(e, toplevel), e); |
| this.expression = null; |
| } |
| |
| public QueryException(QueryExpression expression, String message) { |
| super(message); |
| this.expression = expression; |
| } |
| |
| public QueryException(String message) { |
| this(null, message); |
| } |
| |
| /** |
| * Returns the subexpression for which evaluation failed, or null if |
| * the failure occurred during lexing/parsing. |
| */ |
| public QueryExpression getFailedExpression() { |
| return expression; |
| } |
| |
| } |