FlipComparisonIntention.java

/*
 * Copyright 2000-2016 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.
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package org.jetbrains.plugins.groovy.intentions.control;

import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiElement;
import com.intellij.psi.tree.IElementType;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.plugins.groovy.intentions.GroovyIntentionsBundle;
import org.jetbrains.plugins.groovy.intentions.base.MutablyNamedIntention;
import org.jetbrains.plugins.groovy.intentions.base.PsiElementPredicate;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrBinaryExpression;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrExpression;
import org.jetbrains.plugins.groovy.lang.psi.impl.PsiImplUtil;
import org.jetbrains.plugins.groovy.lang.psi.impl.utils.ComparisonUtils;

public class FlipComparisonIntention extends MutablyNamedIntention {
  @Override
  protected String getTextForElement(PsiElement element) {
    final GrBinaryExpression binaryExpression =
        (GrBinaryExpression) element;
    final IElementType tokenType = binaryExpression.getOperationTokenType();
    final String comparison = ComparisonUtils.getStringForComparison(tokenType);
    final String flippedComparison = ComparisonUtils.getFlippedComparison(tokenType);

    if (comparison.equals(flippedComparison)) {
      return GroovyIntentionsBundle.message("flip.smth.intention.name", comparison);
    }

    return GroovyIntentionsBundle.message("flip.comparison.intention.name", comparison, flippedComparison);
  }

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

  @Override
  public void processIntention(@NotNull PsiElement element, @NotNull Project project, Editor editor)
      throws IncorrectOperationException {
    final GrBinaryExpression exp =
        (GrBinaryExpression) element;
    final IElementType tokenType = exp.getOperationTokenType();

    final GrExpression lhs = exp.getLeftOperand();
    final String lhsText = lhs.getText();

    final GrExpression rhs = exp.getRightOperand();
    final String rhsText = rhs.getText();

    final String flippedComparison = ComparisonUtils.getFlippedComparison(tokenType);

    final String newExpression =
        rhsText + flippedComparison + lhsText;
    PsiImplUtil.replaceExpression(newExpression, exp);
  }

}