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Renders gadgets, provides the gadget metadata service, and serves all javascript required by the OpenSocial specification.

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/*
 * 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.shindig.gadgets.parse.caja;

import com.google.caja.parser.AncestorChain;
import com.google.caja.parser.Visitor;
import com.google.caja.parser.css.CssTree;
import com.google.common.collect.Lists;

import java.util.List;

/**
 * Utility functions for traversing Caja's CSS DOM
 */
public final class CajaCssUtils {
  private CajaCssUtils() {}
  
  /**
   * Get the immediate children of the passed node with the specified node type
   */
  public static  List children(CssTree node, Class nodeType) {
    List result = Lists.newArrayList();
    for (CssTree child : node.children()) {
      if (nodeType.isAssignableFrom(child.getClass())) {
        result.add(nodeType.cast(child));
      }
    }
    return result;
  }

  /**
   * Get all descendants of the passed node with the specified node type
   */
  public static  List descendants(CssTree node, final Class nodeType) {
    final List descendants = Lists.newArrayList();
    node.acceptPreOrder(new Visitor() {
      public boolean visit(AncestorChain ancestorChain) {
        if (nodeType.isAssignableFrom(ancestorChain.node.getClass())) {
          descendants.add(nodeType.cast(ancestorChain.node));
        }
        return true;
      }
    }, null);
    return descendants;
  }
}