com.google.errorprone.bugpatterns.DuplicateMapKeys Maven / Gradle / Ivy

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/*
 * Copyright 2019 The Error Prone Authors.
 *
 * 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.bugpatterns;

import static com.google.errorprone.BugPattern.SeverityLevel.ERROR;

import com.google.errorprone.BugPattern;
import com.google.errorprone.VisitorState;
import com.google.errorprone.bugpatterns.BugChecker.MethodInvocationTreeMatcher;
import com.google.errorprone.matchers.Description;
import com.google.errorprone.matchers.Matcher;
import com.google.errorprone.matchers.method.MethodMatchers;
import com.google.errorprone.util.ASTHelpers;
import com.sun.source.tree.ExpressionTree;
import com.sun.source.tree.MethodInvocationTree;
import java.util.HashSet;
import java.util.Set;

/**
 * Flags duplicate keys used in ImmutableMap construction.
 *
 * @author [email protected] (Sumit Bhagwani)
 */
@BugPattern(
    summary =
        "Map#ofEntries will throw an IllegalArgumentException if there are any duplicate keys",
    severity = ERROR)
public class DuplicateMapKeys extends BugChecker implements MethodInvocationTreeMatcher {

  private static final Matcher METHOD_MATCHER =
      MethodMatchers.staticMethod().onClass("java.util.Map").named("ofEntries");

  private static final Matcher ENTRY_MATCHER =
      MethodMatchers.staticMethod().onClass("java.util.Map").named("entry");

  @Override
  public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) {
    if (!METHOD_MATCHER.matches(tree, state)) {
      return Description.NO_MATCH;
    }
    Set