// 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;
}
}