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A packaging of the IntelliJ Community Edition groovy-psi library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2000-2014 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 org.jetbrains.plugins.groovy.codeInspection;

import com.intellij.codeHighlighting.HighlightDisplayLevel;
import com.intellij.codeInsight.daemon.impl.HighlightInfo;
import com.intellij.codeInsight.daemon.impl.HighlightInfoType;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.psi.PsiElement;
import com.intellij.psi.tree.IElementType;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.plugins.groovy.highlighter.GroovySyntaxHighlighter;
import org.jetbrains.plugins.groovy.lang.lexer.GroovyTokenTypes;
import org.jetbrains.plugins.groovy.lang.psi.GrReferenceElement;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrBinaryExpression;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrExpression;

/**
 * @author Max Medvedev
 */
public class GrInspectionUtil {
  public static boolean isNull(@NotNull GrExpression expression) {
    return "null".equals(expression.getText());
  }

  public static boolean isEquality(@NotNull GrBinaryExpression binaryCondition) {
    final IElementType tokenType = binaryCondition.getOperationTokenType();
    return GroovyTokenTypes.mEQUAL == tokenType;
  }

  public static boolean isInequality(@NotNull GrBinaryExpression binaryCondition) {
    final IElementType tokenType = binaryCondition.getOperationTokenType();
    return GroovyTokenTypes.mNOT_EQUAL == tokenType;
  }

  public static HighlightInfo createAnnotationForRef(@NotNull GrReferenceElement ref,
                                                     @NotNull HighlightDisplayLevel displayLevel,
                                                     @NotNull String message) {
    PsiElement refNameElement = ref.getReferenceNameElement();
    assert refNameElement != null;

    if (displayLevel == HighlightDisplayLevel.ERROR) {
      return HighlightInfo.newHighlightInfo(HighlightInfoType.WRONG_REF).range(refNameElement).descriptionAndTooltip(message).create();
    }

    if (displayLevel == HighlightDisplayLevel.WEAK_WARNING) {
      boolean isTestMode = ApplicationManager.getApplication().isUnitTestMode();
      HighlightInfoType infotype = isTestMode ? HighlightInfoType.WARNING : HighlightInfoType.INFORMATION;

      HighlightInfo.Builder builder = HighlightInfo.newHighlightInfo(infotype).range(refNameElement);
      builder.descriptionAndTooltip(message);
      return builder.needsUpdateOnTyping(false).textAttributes(GroovySyntaxHighlighter.UNRESOLVED_ACCESS).create();
    }

    HighlightInfoType highlightInfoType = HighlightInfo.convertSeverity(displayLevel.getSeverity());
    return HighlightInfo.newHighlightInfo(highlightInfoType).range(refNameElement).descriptionAndTooltip(message).create();
  }
}