plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/conversions/GrConvertTypeCastToSafeCastIntention.java

/*
 * Copyright 2000-2012 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.conversions;

import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiElement;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.plugins.groovy.intentions.base.Intention;
import org.jetbrains.plugins.groovy.intentions.base.PsiElementPredicate;
import org.jetbrains.plugins.groovy.lang.psi.GroovyPsiElementFactory;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrExpression;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrTypeCastExpression;
import org.jetbrains.plugins.groovy.lang.psi.api.types.GrTypeElement;

/**
 * @author Max Medvedev
 */
public class GrConvertTypeCastToSafeCastIntention extends Intention {
  @Override
  protected void processIntention(@NotNull PsiElement element, Project project, Editor editor) throws IncorrectOperationException {
    if (!(element instanceof GrTypeCastExpression)) return;

    GrExpression operand = ((GrTypeCastExpression)element).getOperand();
    GrTypeElement type = ((GrTypeCastExpression)element).getCastTypeElement();

    if (type == null) return;
    if (operand == null) return;

    GroovyPsiElementFactory factory = GroovyPsiElementFactory.getInstance(project);
    GrExpression safeCast = factory.createExpressionFromText(operand.getText() + " as " + type.getText());

    ((GrTypeCastExpression)element).replaceWithExpression(safeCast, true);
  }

  @NotNull
  @Override
  protected PsiElementPredicate getElementPredicate() {
    return new PsiElementPredicate() {
      @Override
      public boolean satisfiedBy(PsiElement element) {
        return element instanceof GrTypeCastExpression &&
               ((GrTypeCastExpression)element).getCastTypeElement() != null &&
               ((GrTypeCastExpression)element).getOperand() != null;
      }
    };
  }
}