java/java-impl/src/com/intellij/codeInsight/generation/surroundWith/JavaWithIfSurrounder.java

/*
 * Copyright 2000-2009 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 com.intellij.codeInsight.generation.surroundWith;

import com.intellij.codeInsight.CodeInsightBundle;
import com.intellij.codeInsight.CodeInsightUtilCore;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.*;
import com.intellij.psi.codeStyle.CodeStyleManager;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NonNls;

public class JavaWithIfSurrounder extends JavaStatementsSurrounder{
  @Override
  public String getTemplateDescription() {
    return CodeInsightBundle.message("surround.with.if.template");
  }

  @Override
  public TextRange surroundStatements(Project project, Editor editor, PsiElement container, PsiElement[] statements) throws IncorrectOperationException{
    PsiManager manager = PsiManager.getInstance(project);
    PsiElementFactory factory = JavaPsiFacade.getInstance(manager.getProject()).getElementFactory();
    CodeStyleManager codeStyleManager = CodeStyleManager.getInstance(project);

    statements = SurroundWithUtil.moveDeclarationsOut(container, statements, true);
    if (statements.length == 0){
      return null;
    }

    @NonNls String text = "if(a){\n}";
    PsiIfStatement ifStatement = (PsiIfStatement)factory.createStatementFromText(text, null);
    ifStatement = (PsiIfStatement)codeStyleManager.reformat(ifStatement);

    ifStatement = (PsiIfStatement)container.addAfter(ifStatement, statements[statements.length - 1]);

    final PsiStatement thenBranch = ifStatement.getThenBranch();
    if (thenBranch != null) {
      PsiCodeBlock thenBlock = ((PsiBlockStatement)thenBranch).getCodeBlock();
      SurroundWithUtil.indentCommentIfNecessary(thenBlock, statements);
      thenBlock.addRange(statements[0], statements[statements.length - 1]);
      container.deleteChildRange(statements[0], statements[statements.length - 1]);
    }

    ifStatement = CodeInsightUtilCore.forcePsiPostprocessAndRestoreElement(ifStatement);
    if (ifStatement == null) {
      return null;
    }

    final PsiExpression condition = ifStatement.getCondition();
    if (condition != null) {
      TextRange range = condition.getTextRange();
      TextRange textRange = new TextRange(range.getStartOffset(), range.getStartOffset());
      editor.getDocument().deleteString(range.getStartOffset(), range.getEndOffset());
      return textRange;
    }
    return ifStatement.getTextRange();
  }
}