JsonDuplicatePropertyKeysInspection.java

/*
 * Copyright 2000-2015 JetBrains s.r.o.
 *
 * 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.intellij.json.codeinsight;

import com.intellij.codeInspection.LocalInspectionTool;
import com.intellij.codeInspection.ProblemsHolder;
import com.intellij.json.JsonBundle;
import com.intellij.json.psi.JsonElementVisitor;
import com.intellij.json.psi.JsonObject;
import com.intellij.json.psi.JsonProperty;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiElementVisitor;
import com.intellij.util.containers.MultiMap;
import org.jetbrains.annotations.Nls;
import org.jetbrains.annotations.NotNull;

import java.util.Collection;
import java.util.Map;

/**
 * @author Mikhail Golubev
 */
public class JsonDuplicatePropertyKeysInspection extends LocalInspectionTool {
  @Nls
  @NotNull
  @Override
  public String getDisplayName() {
    return JsonBundle.message("inspection.duplicate.keys.name");
  }

  @NotNull
  @Override
  public PsiElementVisitor buildVisitor(@NotNull final ProblemsHolder holder, boolean isOnTheFly) {
    return new JsonElementVisitor() {
      @Override
      public void visitObject(@NotNull JsonObject o) {
        final MultiMap<String, PsiElement> keys = new MultiMap<>();
        for (JsonProperty property : o.getPropertyList()) {
          keys.putValue(property.getName(), property.getNameElement());
        }
        for (Map.Entry<String, Collection<PsiElement>> entry : keys.entrySet()) {
          final Collection<PsiElement> sameNamedKeys = entry.getValue();
          if (sameNamedKeys.size() > 1) {
            for (PsiElement element : sameNamedKeys) {
              holder.registerProblem(element, JsonBundle.message("inspection.duplicate.keys.msg.duplicate.keys", entry.getKey()));
            }
          }
        }
      }
    };
  }
}