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A packaging of the IntelliJ Community Edition java-analysis-impl library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2003-2013 Dave Griffith, Bas Leijdekkers
 *
 * 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.siyeh.ig.psiutils;

import com.intellij.psi.JavaTokenType;
import com.intellij.psi.PsiExpression;
import com.intellij.psi.PsiPolyadicExpression;
import com.intellij.psi.tree.IElementType;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

public class ComparisonUtils {

  private ComparisonUtils() {}

  private static final Set s_comparisonTokens = new HashSet(6);

  private static final Map s_swappedComparisons = new HashMap(6);

  private static final Map s_invertedComparisons = new HashMap(6);

  static {
    s_comparisonTokens.add(JavaTokenType.EQEQ);
    s_comparisonTokens.add(JavaTokenType.NE);
    s_comparisonTokens.add(JavaTokenType.GT);
    s_comparisonTokens.add(JavaTokenType.LT);
    s_comparisonTokens.add(JavaTokenType.GE);
    s_comparisonTokens.add(JavaTokenType.LE);

    s_swappedComparisons.put(JavaTokenType.EQEQ, "==");
    s_swappedComparisons.put(JavaTokenType.NE, "!=");
    s_swappedComparisons.put(JavaTokenType.GT, "<");
    s_swappedComparisons.put(JavaTokenType.LT, ">");
    s_swappedComparisons.put(JavaTokenType.GE, "<=");
    s_swappedComparisons.put(JavaTokenType.LE, ">=");

    s_invertedComparisons.put(JavaTokenType.EQEQ, "!=");
    s_invertedComparisons.put(JavaTokenType.NE, "==");
    s_invertedComparisons.put(JavaTokenType.GT, "<=");
    s_invertedComparisons.put(JavaTokenType.LT, ">=");
    s_invertedComparisons.put(JavaTokenType.GE, "<");
    s_invertedComparisons.put(JavaTokenType.LE, ">");
  }

  public static boolean isComparison(@Nullable PsiExpression expression) {
    if (!(expression instanceof PsiPolyadicExpression)) {
      return false;
    }
    final PsiPolyadicExpression polyadicExpression = (PsiPolyadicExpression)expression;
    final IElementType tokenType = polyadicExpression.getOperationTokenType();
    return isComparisonOperation(tokenType);
  }

  public static boolean isComparisonOperation(IElementType tokenType) {
    return s_comparisonTokens.contains(tokenType);
  }

  public static String getFlippedComparison(IElementType tokenType) {
    return s_swappedComparisons.get(tokenType);
  }

  public static boolean isEqualityComparison(@NotNull PsiExpression expression) {
    if (!(expression instanceof PsiPolyadicExpression)) {
      return false;
    }
    final PsiPolyadicExpression polyadicExpression = (PsiPolyadicExpression)expression;
    final IElementType tokenType = polyadicExpression.getOperationTokenType();
    return tokenType.equals(JavaTokenType.EQEQ) || tokenType.equals(JavaTokenType.NE);
  }

  public static String getNegatedComparison(IElementType tokenType) {
    return s_invertedComparisons.get(tokenType);
  }
}