AntImportsIndex.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 org.napile.idea.thermit;

import java.util.HashMap;
import java.util.Map;

import org.jetbrains.annotations.NotNull;
import com.intellij.ide.highlighter.XmlFileType;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.util.indexing.DataIndexer;
import com.intellij.util.indexing.FileBasedIndex;
import com.intellij.util.indexing.FileContent;
import com.intellij.util.indexing.ID;
import com.intellij.util.indexing.ScalarIndexExtension;
import com.intellij.util.io.EnumeratorIntegerDescriptor;
import com.intellij.util.io.KeyDescriptor;
import com.intellij.util.text.CharArrayUtil;
import com.intellij.util.xml.NanoXmlUtil;

/**
 * @author Eugene Zhuravlev
 *         Date: Apr 28, 2008
 */
public class AntImportsIndex extends ScalarIndexExtension<Integer>
{
	public static final ID<Integer, Void> INDEX_NAME = ID.create("thermit-imports");
	private static final int VERSION = 5;
	public static final Integer ANT_FILES_WITH_IMPORTS_KEY = new Integer(0);

	private static final DataIndexer<Integer, Void, FileContent> DATA_INDEXER = new DataIndexer<Integer, Void, FileContent>()
	{
		@Override
		@NotNull
		public Map<Integer, Void> map(final FileContent inputData)
		{
			final Map<Integer, Void> map = new HashMap<Integer, Void>();

			NanoXmlUtil.parse(CharArrayUtil.readerFromCharSequence(inputData.getContentAsText()), new NanoXmlUtil.IXMLBuilderAdapter()
			{
				private boolean isFirstElement = true;

				@Override
				public void startElement(final String elemName, final String nsPrefix, final String nsURI, final String systemID, final int lineNr) throws Exception
				{
					if(isFirstElement)
					{
						if(!"project".equalsIgnoreCase(elemName))
						{
							stop();
						}
						isFirstElement = false;
					}
					else
					{
						if("import".equalsIgnoreCase(elemName) || "include".equalsIgnoreCase(elemName))
						{
							map.put(ANT_FILES_WITH_IMPORTS_KEY, null);
							stop();
						}
					}
				}

				@Override
				public void addAttribute(final String key, final String nsPrefix, final String nsURI, final String value, final String type) throws Exception
				{
					//if (myAttributes != null) {
					//  myAttributes.add(key);
					//}
				}

				@Override
				public void elementAttributesProcessed(final String name, final String nsPrefix, final String nsURI) throws Exception
				{
					//if (myAttributes != null) {
					//  if (!(myAttributes.contains("name") && myAttributes.contains("default"))) {
					//    stop();
					//  }
					//  myAttributes = null;
					//}
				}

			});
			return map;
		}
	};
	private static final FileBasedIndex.InputFilter INPUT_FILTER = new FileBasedIndex.InputFilter()
	{
		@Override
		public boolean acceptInput(final VirtualFile file)
		{
			return file.getFileType() instanceof XmlFileType;
		}
	};

	@Override
	public int getVersion()
	{
		return VERSION;
	}

	@Override
	@NotNull
	public ID<Integer, Void> getName()
	{
		return INDEX_NAME;
	}

	@Override
	@NotNull
	public DataIndexer<Integer, Void, FileContent> getIndexer()
	{
		return DATA_INDEXER;
	}

	@Override
	public KeyDescriptor<Integer> getKeyDescriptor()
	{
		return EnumeratorIntegerDescriptor.INSTANCE;
	}

	@Override
	public FileBasedIndex.InputFilter getInputFilter()
	{
		return INPUT_FILTER;
	}

	@Override
	public boolean dependsOnFileContent()
	{
		return true;
	}
}