groovy.util.slurpersupport.FilteredNodeChildren Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of groovy-all Show documentation
Show all versions of groovy-all Show documentation
Groovy: A powerful, dynamic language for the JVM
/*
* 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 groovy.util.slurpersupport;
import java.util.Iterator;
import java.util.Map;
import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
import groovy.lang.Closure;
/**
* Lazy evaluated representation of child nodes filtered by a Closure.
*
* @author John Wilson
*/
public class FilteredNodeChildren extends NodeChildren {
private final Closure closure;
/**
* @param parent the GPathResult prior to the application of the expression creating this GPathResult
* @param closure the Closure to use to filter the nodes
* @param namespaceTagHints the known tag to namespace mappings
*/
public FilteredNodeChildren(final GPathResult parent, final Closure closure, final Map namespaceTagHints) {
super(parent, parent.name, namespaceTagHints);
this.closure = closure;
}
public GPathResult pop() {
return this.parent.parent;
}
public Iterator nodeIterator() {
return new NodeIterator(this.parent.nodeIterator()) {
protected Object getNextNode(final Iterator iter) {
while (iter.hasNext()) {
final Object node = iter.next();
if (closureYieldsTrueForNode(new NodeChild((Node) node, FilteredNodeChildren.this.parent, FilteredNodeChildren.this.namespaceTagHints))) {
return node;
}
}
return null;
}
};
}
private boolean closureYieldsTrueForNode(Object childNode) {
return DefaultTypeTransformation.castToBoolean(FilteredNodeChildren.this.closure.call(new Object[]{childNode}));
}
}