MergeElseIfPredicate.java

/*
 * Copyright 2000-2017 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.
 */
package org.jetbrains.plugins.groovy.intentions.control;

import com.intellij.psi.PsiElement;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.plugins.groovy.intentions.base.PsiElementPredicate;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.GrBlockStatement;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.GrIfStatement;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.GrStatement;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.blocks.GrOpenBlock;

class MergeElseIfPredicate implements PsiElementPredicate {

  @Override
  public boolean satisfiedBy(@NotNull PsiElement element) {
    if (!(element instanceof GrIfStatement)) {
      return false;
    }
    final GrIfStatement ifStatement = (GrIfStatement) element;
    final GrStatement thenBranch = ifStatement.getThenBranch();
    if (thenBranch == null) {
      return false;
    }
    final GrStatement elseBranch = ifStatement.getElseBranch();
    if (!(elseBranch instanceof GrBlockStatement)) {
      return false;
    }
    final GrOpenBlock block = ((GrBlockStatement) elseBranch).getBlock();
    final GrStatement[] statements = block.getStatements();
    return statements.length == 1 &&
        statements[0] instanceof GrIfStatement;
  }
}