plugins/IntentionPowerPak/src/com/siyeh/ipp/parenthesis/UnnecessaryParenthesesPredicate.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.siyeh.ig.psiutils.ParenthesesUtils;
import com.siyeh.ipp.base.PsiElementPredicate;

class UnnecessaryParenthesesPredicate implements PsiElementPredicate {

  public boolean satisfiedBy(PsiElement element) {
    if (element instanceof PsiParameterList) {
      final PsiParameterList parameterList = (PsiParameterList)element;
      final PsiElement parent = element.getParent();
      if (parent instanceof PsiLambdaExpression && parameterList.getParametersCount() == 1) {
        final PsiParameter parameter = parameterList.getParameters()[0];
        return parameter.getTypeElement() == null && element.getFirstChild() != parameter && element.getLastChild() != parameter;
      }
    }
    if (!(element instanceof PsiParenthesizedExpression)) {
      return false;
    }
    final PsiParenthesizedExpression expression = (PsiParenthesizedExpression)element;
    return !ParenthesesUtils.areParenthesesNeeded(expression, false);
  }
}