/*
* Copyright 2015 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.errorprone.matchers.method;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableList;
import com.google.errorprone.VisitorState;
import com.google.errorprone.matchers.method.MethodMatchers.ParameterMatcher;
import com.google.errorprone.suppliers.Supplier;
import com.google.errorprone.util.ASTHelpers;
import com.sun.source.tree.ExpressionTree;
import com.sun.tools.javac.code.Type;
/** Matches on a method's formal parameters. */
public class ParameterMatcherImpl extends AbstractChainedMatcher<MatchState, MatchState>
implements ParameterMatcher {
private final ImmutableList<Supplier<Type>> expected;
ParameterMatcherImpl(AbstractSimpleMatcher<MatchState> baseMatcher,
ImmutableList<Supplier<Type>> parameterTypes) {
super(baseMatcher);
this.expected = parameterTypes;
}
@Override
protected Optional<MatchState> matchResult(ExpressionTree item, MatchState info,
VisitorState state) {
ImmutableList<Type> actual = ImmutableList.copyOf(info.paramTypes());
if (actual.size() != expected.size()) {
return Optional.absent();
}
for (int i = 0; i < actual.size(); ++i) {
if (!ASTHelpers.isSameType(actual.get(i), expected.get(i).get(state), state)) {
return Optional.absent();
}
}
return Optional.of(info);
}
}