plugins/IntentionPowerPak/src/com/siyeh/ipp/equality/ReplaceEqualityWithEqualsIntention.java


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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.ipp.equality;

import com.intellij.psi.JavaTokenType;
import com.intellij.psi.PsiBinaryExpression;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiExpression;
import com.intellij.psi.tree.IElementType;
import com.intellij.util.IncorrectOperationException;
import com.siyeh.ig.PsiReplacementUtil;
import com.siyeh.ig.psiutils.ParenthesesUtils;
import com.siyeh.ipp.base.Intention;
import com.siyeh.ipp.base.PsiElementPredicate;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;

public class ReplaceEqualityWithEqualsIntention extends Intention {

  @NotNull
  public PsiElementPredicate getElementPredicate() {
    return new ObjectEqualityPredicate();
  }

  public void processIntention(PsiElement element)
    throws IncorrectOperationException {
    final PsiBinaryExpression exp =
      (PsiBinaryExpression)element;
    final PsiExpression lhs = exp.getLOperand();
    final PsiExpression rhs = exp.getROperand();
    if (rhs == null) {
      return;
    }
    final PsiExpression strippedLhs =
      ParenthesesUtils.stripParentheses(lhs);
    if (strippedLhs == null) {
      return;
    }
    final PsiExpression strippedRhs =
      ParenthesesUtils.stripParentheses(rhs);
    if (strippedRhs == null) {
      return;
    }
    final IElementType tokenType = exp.getOperationTokenType();
    @NonNls final String expString;
    if (tokenType.equals(JavaTokenType.EQEQ)) {
      if (ParenthesesUtils.getPrecedence(strippedLhs) >
          ParenthesesUtils.METHOD_CALL_PRECEDENCE) {
        expString = '(' + strippedLhs.getText() + ").equals(" +
                    strippedRhs.getText() + ')';
      }
      else {
        expString = strippedLhs.getText() + ".equals(" +
                    strippedRhs.getText() + ')';
      }
    }
    else {
      if (ParenthesesUtils.getPrecedence(strippedLhs) >
          ParenthesesUtils.METHOD_CALL_PRECEDENCE) {
        expString = "!(" + strippedLhs.getText() + ").equals(" +
                    strippedRhs.getText() + ')';
      }
      else {
        expString = '!' + strippedLhs.getText() + ".equals(" +
                    strippedRhs.getText() + ')';
      }
    }
    PsiReplacementUtil.replaceExpression(exp, expString);
  }
}