com.google.errorprone.matchers.method.ParameterMatcherImpl.java Source code

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Here is the source code for com.google.errorprone.matchers.method.ParameterMatcherImpl.java

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/*
 * 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.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 (info.sym().isVarArgs()) {
            if (actual.size() < expected.size()) {
                return Optional.absent();
            }
        } else if (actual.size() != expected.size()) {
            return Optional.absent();
        }

        for (int i = 0; i < actual.size(); ++i) {
            if (!state.getTypes().isSameType(actual.get(i), expected.get(i).get(state))) {
                return Optional.absent();
            }
        }
        return Optional.of(info);
    }
}