groovy.util.slurpersupport.NoChildren 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 groovy.lang.Closure;
import groovy.lang.GroovyObject;
import groovy.lang.GroovyRuntimeException;
import java.io.IOException;
import java.io.Writer;
import java.util.Iterator;
import java.util.Map;
/**
* Lazy evaluated representation of a GPath expression returning no children.
*
* As this class represents a GPath expression with no results, all methods
* are either NOPs or return an empty result.
*
* @author John Wilson
*/
public class NoChildren extends GPathResult {
/**
* @param parent the GPathResult prior to the application of the expression creating this GPathResult
* @param name if the GPathResult corresponds to something with a name, e.g. a node
* @param namespaceTagHints the known tag to namespace mappings
*/
public NoChildren(final GPathResult parent, final String name, final Map namespaceTagHints) {
super(parent, name, "*", namespaceTagHints);
}
/**
* Returns 0
.
* @return 0
*/
public int size() {
return 0;
}
/**
* Returns an empty String
.
* @return an empty String
*/
public String text() {
return "";
}
/**
* Throws a GroovyRuntimeException
, because it is not implemented yet.
*/
public GPathResult parents() {
// TODO Auto-generated method stub
throw new GroovyRuntimeException("parents() not implemented yet");
}
/**
* Returns an empty Iterator
.
* @return an empty Iterator
*/
public Iterator childNodes() {
return iterator();
}
/**
* Returns an empty Iterator
.
* @return an empty Iterator
*/
public Iterator iterator() {
return new Iterator() {
public boolean hasNext() {
return false;
}
public Object next() {
return null;
}
public void remove() {
throw new UnsupportedOperationException();
}
};
}
/**
* Returns this
.
* @return this
*/
public GPathResult find(final Closure closure) {
return this;
}
/**
* Returns this
.
* @return this
*/
public GPathResult findAll(final Closure closure) {
return this;
}
/**
* Returns an empty iterator.
* @return an empty iterator
*/
public Iterator nodeIterator() {
return iterator();
}
/**
* Does not write any output, just returns the writer.
*
* @return the Writer
which was passed in
*/
public Writer writeTo(final Writer out) throws IOException {
return out;
}
/**
* NOP
*/
public void build(final GroovyObject builder) {
}
/**
* NOP
*/
protected void replaceNode(final Closure newValue) {
// No elements match GPath expression - do nothing
}
/**
* NOP
*/
protected void replaceBody(final Object newValue) {
// No elements match GPath expression - do nothing
}
/**
* NOP
*/
protected void appendNode(final Object newValue) {
// TODO consider creating an element for this
}
/**
* Returns false
.
* @return false
*/
public boolean asBoolean() {
return false;
}
}