plugins/IntentionPowerPak/src/com/siyeh/ipp/trivialif/MergeElseIfPredicate.java

/*
 * Copyright 2003-2006 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.trivialif;

import com.intellij.psi.*;
import com.siyeh.ipp.base.PsiElementPredicate;
import com.siyeh.ipp.psiutils.ErrorUtil;
import org.jetbrains.annotations.NonNls;

class MergeElseIfPredicate implements PsiElementPredicate {

  public boolean satisfiedBy(PsiElement element) {
    if (!(element instanceof PsiJavaToken)) {
      return false;
    }
    @NonNls final String text = element.getText();
    if (!PsiKeyword.ELSE.equals(text)) {
      return false;
    }
    final PsiJavaToken token = (PsiJavaToken)element;
    final PsiElement parent = token.getParent();
    if (!(parent instanceof PsiIfStatement)) {
      return false;
    }
    final PsiIfStatement ifStatement = (PsiIfStatement)parent;
    if (ErrorUtil.containsError(ifStatement)) {
      return false;
    }
    final PsiStatement thenBranch = ifStatement.getThenBranch();
    final PsiStatement elseBranch = ifStatement.getElseBranch();
    if (thenBranch == null) {
      return false;
    }
    if (!(elseBranch instanceof PsiBlockStatement)) {
      return false;
    }
    final PsiCodeBlock block =
      ((PsiBlockStatement)elseBranch).getCodeBlock();
    final PsiStatement[] statements = block.getStatements();
    return statements.length == 1 &&
           statements[0] instanceof PsiIfStatement;
  }
}