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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;
import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
/**
* Lazy evaluated representation of a node attribute.
*
* @author John Wilson
*/
public class Attribute extends GPathResult {
private final String value;
/**
* @param name of the attribute
* @param value of the attribute
* @param parent the GPathResult prior to the application of the expression creating this GPathResult
* @param namespacePrefix the namespace prefix if any
* @param namespaceTagHints the known tag to namespace mappings
*/
public Attribute(final String name, final String value, final GPathResult parent, final String namespacePrefix, final Map namespaceTagHints) {
super(parent, name, namespacePrefix, namespaceTagHints);
this.value = value;
}
public String name() {
// this name contains @name we need to return name
return this.name.substring(1);
}
/**
* Returns the size of this Attribute, which is always 1
.
* @return 1
*/
public int size() {
return 1;
}
/**
* Returns the value of this Attribute.
* @return the value of this Attribute
*/
public String text() {
return this.value;
}
/**
* Returns the URI of the namespace of this Attribute.
* @return the namespace of this Attribute
*/
public String namespaceURI() {
if (namespacePrefix == null || namespacePrefix.isEmpty()) return "";
String uri = namespaceTagHints.get(namespacePrefix);
return uri == null ? "" : uri;
}
/**
* Throws a GroovyRuntimeException
, because this method is not implemented yet.
*/
public GPathResult parents() {
// TODO Auto-generated method stub
throw new GroovyRuntimeException("parents() not implemented yet");
}
/**
* Throws a GroovyRuntimeException
, because an attribute can have no children.
*/
public Iterator childNodes() {
throw new GroovyRuntimeException("can't call childNodes() in the attribute " + this.name);
}
public Iterator iterator() {
return nodeIterator();
}
public GPathResult find(final Closure closure) {
if (DefaultTypeTransformation.castToBoolean(closure.call(new Object[]{this}))) {
return this;
} else {
return new NoChildren(this, "", this.namespaceTagHints);
}
}
public GPathResult findAll(final Closure closure) {
return find(closure);
}
public Iterator nodeIterator() {
return new Iterator() {
private boolean hasNext = true;
public boolean hasNext() {
return this.hasNext;
}
public Object next() {
try {
return (this.hasNext) ? Attribute.this : null;
} finally {
this.hasNext = false;
}
}
public void remove() {
throw new UnsupportedOperationException();
}
};
}
public Writer writeTo(final Writer out) throws IOException {
out.write(this.value);
return out;
}
public void build(final GroovyObject builder) {
builder.getProperty("mkp");
builder.invokeMethod("yield", new Object[]{this.value});
}
/**
* NOP, because an attribute does not have any Node to replace.
*/
protected void replaceNode(final Closure newValue) {
}
/**
* NOP, because an attribute does not have a Body.
*/
protected void replaceBody(final Object newValue) {
}
/**
* NOP, because an node can not be appended to an attribute.
*/
protected void appendNode(final Object newValue) {
}
}