content: /**
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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.apache.solr.core;
  
  import org.apache.solr.common.util.NamedList;
  import org.apache.solr.common.util.DOMUtil;
  import org.w3c.dom.Node;
  import org.w3c.dom.NodeList;
  
  import java.util.*;
  import static java.util.Collections.unmodifiableList;
  import static java.util.Collections.unmodifiableMap;
  
  /**
   * An Object which represents a Plugin of any type 
   * @version $Id: PluginInfo.java 1144417 2011-07-08 18:29:20Z hossman $
   */
  public class PluginInfo {
    public final String name, className, type;
    public final NamedList initArgs;
    public final Map<String, String> attributes;
    public final List<PluginInfo> children;
  
    public PluginInfo(String type, Map<String, String> attrs ,NamedList initArgs, List<PluginInfo> children) {
      this.type = type;
      this.name = attrs.get("name");
      this.className = attrs.get("class");
      this.initArgs = initArgs;
      attributes = unmodifiableMap(attrs);
      this.children = children == null ? Collections.<PluginInfo>emptyList(): unmodifiableList(children);
    }
  
  
    public PluginInfo(Node node, String err, boolean requireName, boolean requireClass) {
      type = node.getNodeName();
      name = DOMUtil.getAttr(node, "name", requireName ? err : null);
      className = DOMUtil.getAttr(node, "class", requireClass ? err : null);
      initArgs = DOMUtil.childNodesToNamedList(node);
      attributes = unmodifiableMap(DOMUtil.toMap(node.getAttributes()));
      children = loadSubPlugins(node);
    }
  
    private List<PluginInfo> loadSubPlugins(Node node) {
      List<PluginInfo> children = new ArrayList<PluginInfo>();
      //if there is another sub tag with a non namedlist tag that has to be another plugin
      NodeList nlst = node.getChildNodes();
      for (int i = 0; i < nlst.getLength(); i++) {
        Node nd = nlst.item(i);
        if (nd.getNodeType() != Node.ELEMENT_NODE) continue;
        if (NL_TAGS.contains(nd.getNodeName())) continue;
        PluginInfo pluginInfo = new PluginInfo(nd, null, false, false);
        if (pluginInfo.isEnabled()) children.add(pluginInfo);
      }
      return children.isEmpty() ? Collections.<PluginInfo>emptyList() : unmodifiableList(children);
    }
  
    @Override
    public String toString() {
      StringBuilder sb = new StringBuilder("{");
      if (type != null) sb.append("type = " + type + ",");
      if (name != null) sb.append("name = " + name + ",");
      if (className != null) sb.append("class = " + className + ",");
      if (initArgs.size() > 0) sb.append("args = " + initArgs);
      sb.append("}");
      return sb.toString();
    }
  
    public boolean isEnabled(){
      String enable = attributes.get("enable");
      return enable == null || Boolean.parseBoolean(enable); 
    }
  
    public boolean isDefault() {
      return Boolean.parseBoolean(attributes.get("default"));
    }
  
    public PluginInfo getChild(String type){
      List<PluginInfo> l = getChildren(type);
      return  l.isEmpty() ? null:l.get(0);
    }
  
    /**Filter children by type
     * @param type The type name. must not be null
     * @return The mathcing children
     */
    public List<PluginInfo> getChildren(String type){
      if(children.isEmpty()) return children;
      List<PluginInfo> result = new ArrayList<PluginInfo>();
      for (PluginInfo child : children) if(type.equals(child.type)) result.add(child);
      return result;
    }
    public static final PluginInfo EMPTY_INFO = new PluginInfo("",Collections.<String,String>emptyMap(), new NamedList(),Collections.<PluginInfo>emptyList());
  
    private static final HashSet<String> NL_TAGS = new HashSet<String>
      (Arrays.asList("lst", "arr",
                     "bool",
                     "str",
                     "int","long",
                     "float","double"));
  }
  