plugins/IntentionPowerPak/src/com/siyeh/ipp/parenthesis/RemoveUnnecessaryParenthesesIntention.java

/*
 * 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.parenthesis;

import com.intellij.psi.*;
import com.intellij.util.IncorrectOperationException;
import com.siyeh.ig.psiutils.ParenthesesUtils;
import com.siyeh.ipp.base.Intention;
import com.siyeh.ipp.base.PsiElementPredicate;
import org.jetbrains.annotations.NotNull;

public class RemoveUnnecessaryParenthesesIntention extends Intention {

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

  @Override
  public void processIntention(@NotNull PsiElement element) throws IncorrectOperationException {
    if (element instanceof PsiParameterList) {
      stripLambdaParameterParentheses((PsiParameterList)element);
      return;
    }
    PsiExpression expression = (PsiExpression)element;
    ParenthesesUtils.removeParentheses(expression, false);
  }

  public static void stripLambdaParameterParentheses(PsiParameterList element) {
    final PsiElementFactory factory = JavaPsiFacade.getElementFactory(element.getProject());
    final String text = element.getParameters()[0].getName() + "->{}";
    final PsiLambdaExpression expression = (PsiLambdaExpression)factory.createExpressionFromText(text, element);
    element.replace(expression.getParameterList());
  }
}