/*
* 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;
import com.google.errorprone.VisitorState;
import com.google.errorprone.dataflow.nullnesspropagation.Nullness;
import com.sun.source.tree.ExpressionTree;
import com.sun.source.util.TreePath;
/**
* Matches an expression based on the result of the nullness dataflow analysis.
*/
public class NullnessMatcher implements Matcher<ExpressionTree> {
private final Nullness expectedNullnessValue;
public NullnessMatcher(Nullness expectedNullnessValue) {
this.expectedNullnessValue = expectedNullnessValue;
}
@Override
public boolean matches(ExpressionTree expr, VisitorState state) {
TreePath exprPath = new TreePath(state.getPath(), expr);
return state.getNullnessAnalysis().getNullness(exprPath, state.context)
== expectedNullnessValue;
}
}