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// Copyright 2014 Google Inc. 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.syntax;
import com.google.common.collect.ImmutableMap;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* Syntax node for dictionary comprehension expressions.
*/
public class DictComprehension extends AbstractComprehension {
private final Expression keyExpression;
private final Expression valueExpression;
public DictComprehension(Expression keyExpression, Expression valueExpression) {
super('{', '}', keyExpression, valueExpression);
this.keyExpression = keyExpression;
this.valueExpression = valueExpression;
}
@Override
String printExpressions() {
return String.format("%s: %s", keyExpression, valueExpression);
}
@Override
OutputCollector createCollector() {
return new DictOutputCollector();
}
/**
* Helper class that collects the intermediate results of the {@link DictComprehension} and
* provides access to the resulting {@link Map}.
*/
private final class DictOutputCollector implements OutputCollector {
private final Map<Object, Object> result;
DictOutputCollector() {
// We want to keep the iteration order
result = new LinkedHashMap<>();
}
@Override
public void evaluateAndCollect(Environment env) throws EvalException, InterruptedException {
Object key = keyExpression.eval(env);
EvalUtils.checkValidDictKey(key);
result.put(key, valueExpression.eval(env));
}
@Override
public Object getResult(Environment env) throws EvalException {
return ImmutableMap.copyOf(result);
}
}
}
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