01: /*
02: /*
03: * Copyright 2005 John G. Wilson
04: *
05: * Licensed under the Apache License, Version 2.0 (the "License");
06: * you may not use this file except in compliance with the License.
07: * You may obtain a copy of the License at
08: *
09: * 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: private final Closure closure;
34:
35: public FilteredAttributes(final GPathResult parent,
36: 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: protected Object getNextNode(final Iterator iter) {
44: while (iter.hasNext()) {
45: final Object node = iter.next();
46: if (DefaultTypeTransformation
47: .castToBoolean(FilteredAttributes.this .closure
48: .call(new Object[] { node }))) {
49: return node;
50: }
51: }
52: return null;
53: }
54: };
55: }
56:
57: }
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