XmlTagNamesIndex.java

/*
 * Copyright 2000-2014 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.xml.index;

import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.util.containers.HashMap;
import com.intellij.util.indexing.*;
import com.intellij.util.io.DataExternalizer;
import com.intellij.util.io.VoidDataExternalizer;
import com.intellij.util.text.CharArrayUtil;
import com.intellij.xml.util.XmlUtil;
import org.jetbrains.annotations.NotNull;

import java.util.Collection;
import java.util.Collections;
import java.util.Map;

/**
 * @author Dmitry Avdeev
 */
public class XmlTagNamesIndex extends XmlIndex<Void> {

  public static Collection<VirtualFile> getFilesByTagName(String tagName, final Project project) {
    return FileBasedIndex.getInstance().getContainingFiles(NAME, tagName, createFilter(project));
  }

  public static Collection<String> getAllTagNames(Project project) {
    return FileBasedIndex.getInstance().getAllKeys(NAME, project);
  }

  static final ID<String,Void> NAME = ID.create("XmlTagNames");

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

  @Override
  @NotNull
  public DataIndexer<String, Void, FileContent> getIndexer() {
    return new DataIndexer<String, Void, FileContent>() {
      @Override
      @NotNull
      public Map<String, Void> map(@NotNull final FileContent inputData) {
        CharSequence text = inputData.getContentAsText();
        if (StringUtil.indexOf(text, XmlUtil.XML_SCHEMA_URI) == -1) return Collections.emptyMap();
        Collection<String> tags = XsdTagNameBuilder.computeTagNames(CharArrayUtil.readerFromCharSequence(text));
        Map<String, Void> map = new HashMap<>(tags.size());
        for (String tag : tags) {
          map.put(tag, null);
        }
        return map;
      }
    };
  }

  @NotNull
  @Override
  public DataExternalizer<Void> getValueExternalizer() {
    return VoidDataExternalizer.INSTANCE;
  }

}