plugins/IntentionPowerPak/src/com/siyeh/ipp/chartostring/StringToCharIntention.java

/*
 * Copyright 2003-2011 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.chartostring;

import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiLiteralExpression;
import com.intellij.util.IncorrectOperationException;
import com.siyeh.ig.PsiReplacementUtil;
import com.siyeh.ipp.base.Intention;
import com.siyeh.ipp.base.PsiElementPredicate;
import org.jetbrains.annotations.NotNull;

public class StringToCharIntention extends Intention {

  @Override
  @NotNull
  protected PsiElementPredicate getElementPredicate() {
    return new StringToCharPredicate();
  }

  @Override
  public void processIntention(PsiElement element)
    throws IncorrectOperationException {
    final PsiLiteralExpression stringLiteral =
      (PsiLiteralExpression)element;
    final String stringLiteralText = stringLiteral.getText();
    final String charLiteral = charForStringLiteral(stringLiteralText);
    PsiReplacementUtil.replaceExpression(stringLiteral, charLiteral);
  }

  private static String charForStringLiteral(String stringLiteral) {
    if ("\"'\"".equals(stringLiteral)) {
      return "'\\''";
    }
    else if ("\"\\\"\"".equals(stringLiteral)) {
      return "'\"'";
    }
    else {
      return '\'' +
             stringLiteral.substring(1, stringLiteral.length() - 1) +
             '\'';
    }
  }
}