AntRenameHandler.java

/*
 * Copyright 2000-2010 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.napile.idea.thermit.refactoring;

import java.util.Collection;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.napile.idea.thermit.dom.AntDomFileDescription;
import com.intellij.codeInsight.TargetElementUtilBase;
import com.intellij.openapi.actionSystem.DataContext;
import com.intellij.openapi.actionSystem.LangDataKeys;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.project.IndexNotReadyException;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.PsiReference;
import com.intellij.psi.xml.XmlFile;
import com.intellij.refactoring.rename.PsiElementRenameHandler;
import com.intellij.util.containers.ContainerUtil;

/**
 * @author Eugene Zhuravlev
 *         Date: Mar 19, 2007
 */
public final class AntRenameHandler extends PsiElementRenameHandler
{

	public boolean isAvailableOnDataContext(final DataContext dataContext)
	{
		final PsiElement[] elements = getElements(dataContext);
		return elements != null && elements.length > 1;
	}

	public void invoke(@NotNull final Project project, final Editor editor, final PsiFile file, final DataContext dataContext)
	{
		final PsiElement[] elements = getElements(dataContext);
		if(elements != null && elements.length > 0)
		{
			invoke(project, new PsiElement[]{elements[0]}, dataContext);
		}
	}

	public void invoke(@NotNull final Project project, @NotNull final PsiElement[] elements, final DataContext dataContext)
	{
		super.invoke(project, elements, dataContext);
	}

	@Nullable
	private static PsiElement[] getElements(DataContext dataContext)
	{
		final PsiFile psiFile = LangDataKeys.PSI_FILE.getData(dataContext);
		if(!(psiFile instanceof XmlFile && AntDomFileDescription.isAntFile((XmlFile) psiFile)))
		{
			return null;
		}
		final Editor editor = LangDataKeys.EDITOR.getData(dataContext);
		if(editor == null)
		{
			return null;
		}
		return getPsiElementsIn(editor, psiFile);
	}

	@Nullable
	private static PsiElement[] getPsiElementsIn(final Editor editor, final PsiFile psiFile)
	{
		try
		{
			final PsiReference reference = TargetElementUtilBase.findReference(editor, editor.getCaretModel().getOffset());
			if(reference == null)
			{
				return null;
			}
			final Collection<PsiElement> candidates = TargetElementUtilBase.getInstance().getTargetCandidates(reference);
			return ContainerUtil.toArray(candidates, new PsiElement[candidates.size()]);
		}
		catch(IndexNotReadyException e)
		{
			return null;
		}
	}

}