View Javadoc

1   /*
2    /*
3    * Copyright 2005 John G. Wilson
4    *
5    * Licensed under the Apache License, Version 2.0 (the "License");
6    * you may not use this file except in compliance with the License.
7    * You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   *
17   */
18  package groovy.util.slurpersupport;
19  
20  import java.util.Iterator;
21  import java.util.Map;
22  
23  import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
24  
25  import groovy.lang.Closure;
26  
27  /***
28   * Lazy evaluated representation of nodes filtered by attributes.
29   *
30   * @author John Wilson
31   */
32  public class FilteredAttributes extends Attributes
33  {
34      private final Closure closure;
35  
36      public FilteredAttributes(final GPathResult parent, final Closure closure, final Map namespaceTagHints) {
37          super(parent, parent.name, namespaceTagHints);
38          this.closure = closure;
39      }
40  
41      public Iterator nodeIterator() {
42          return new NodeIterator(this.parent.iterator())
43          {
44              protected Object getNextNode(final Iterator iter) {
45                  while (iter.hasNext()) {
46                      final Object node = iter.next();
47                      if (DefaultTypeTransformation.castToBoolean(FilteredAttributes.this.closure.call(new Object[]{node}))) {
48                          return node;
49                      }
50                  }
51                  return null;
52              }
53          };
54      }
55  
56  }