org.jivesoftware.util.ElementUtil Maven / Gradle / Ivy
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/*
* Copyright (C) 2004-2009 Jive Software. All rights reserved.
*
* Licensed 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 org.jivesoftware.util;
import org.dom4j.Element;
import org.dom4j.Node;
import java.util.*;
/**
* We use a simple
* naming convention of meta-data key names: data is stored
* heirarchically separated by dots. The last name may contain
* a colon ':' character that is read as name:attribute.
* For example setting X.Y.Z to someValue, would map to an XML snippet of:
*
* <X>
* <Y>
* <Z>someValue</Z>
* </Y>
* </X>
*
* And X.Y.Z:key to anotherValue as:
*
* <X>
* <Y>
* <Z key="anotherValue" />
* </Y>
* </X>
*
* Some XML cannot be built or accessed using this naming
* convention (e.g. a typical Roster reset packet). More complex XML
* packet should be represented using the XMPPDOMFragment. The
* Element class is designed to provide 80% of XML
* manipulation capabilities with the simplest 20% of code and API size
* making it convenient for meta-data, simple IQ packets, etc.
*/
public class ElementUtil {
private ElementUtil() {
}
/**
* Returns the value of the specified property. A null answer does not necessarily mean
* that the property does not exist.
*
* @param name the name of the property to get.
* @return the value of the specified property.
*/
public static String getProperty(Element element, String name) {
String value = null;
String[] propName = parsePropertyName(name);
// Grab the attribute if there is one
String lastName = propName[propName.length - 1];
String attName = null;
int attributeIndex = lastName.indexOf(':');
if (attributeIndex >= 0) {
propName[propName.length - 1] = lastName.substring(0, attributeIndex);
attName = lastName.substring(attributeIndex + 1);
}
// Search for this property by traversing down the XML hierarchy.
int i = propName[0].equals(element.getName()) ? 1 : 0;
for (; i < propName.length; i++) {
element = element.element(propName[i]);
if (element == null) {
break;
}
}
if (element != null) {
if (attName == null) {
value = element.getTextTrim();
}
else {
value = element.attributeValue(attName);
}
}
return value;
}
/**
* Returns true if the specified property is included in the XML hierarchy. A property could
* have a value associated or not. If the property has an associated value then
*
* @param name the name of the property to find out.
* @return true if the specified property is included in the XML hierarchy.
*/
public static boolean includesProperty(Element element, String name) {
String[] propName = parsePropertyName(name);
// Grab the attribute if there is one
String lastName = propName[propName.length - 1];
String attName = null;
int attributeIndex = lastName.indexOf(':');
if (attributeIndex >= 0) {
propName[propName.length - 1] = lastName.substring(0, attributeIndex);
attName = lastName.substring(attributeIndex + 1);
}
// Search for this property by traversing down the XML hierarchy.
int i = propName[0].equals(element.getName()) ? 1 : 0;
for (; i < propName.length; i++) {
element = element.element(propName[i]);
if (element == null) {
break;
}
}
if (element != null) {
if (attName == null){
// The property exists so return true
return true;
} else {
// The property exists if the attribute exists in the element
return element.attribute(attName) != null;
}
}
else {
// The property does not exist so return false
return false;
}
}
/**
* Return all values who's path matches the given property name as a String array,
* or an empty array if the if there are no children. You MAY NOT use the atttribute
* markup (using a ':' in the last element name) with this call.
*
* getProperties() allows you to retrieve several values with the same property name.
* For example, consider the XML file entry:
*
* <foo>
* <bar>
* <prop>some value</prop>
* <prop>other value</prop>
* <prop>last value</prop>
* </bar>
* </foo>
*
* If you call getProperties("foo.bar.prop") will return a string array containing
* {"some value", "other value", "last value"}.
*
* @param name the name of the property to retrieve
* @return all child property values for the given node name.
*/
public String[] getProperties(Element element, String name) {
String[] propName = parsePropertyName(name);
// Search for this property by traversing down the XML heirarchy, stopping one short.
int i = propName[0].equals(element.getName()) ? 1 : 0;
for (; i < propName.length - 1; i++) {
element = element.element(propName[i]);
if (element == null) {
// This node doesn't match this part of the property name which
// indicates this property doesn't exist so return empty array.
return new String[]{};
}
}
// We found matching property, return names of children.
Iterator iter = element.elementIterator(propName[propName.length - 1]);
ArrayList props = new ArrayList<>();
while (iter.hasNext()) {
Element e = (Element) iter.next();
props.add(e.getName());
}
String[] childrenNames = new String[props.size()];
return props.toArray(childrenNames);
}
/**
* Sets a property to an array of values. You MAY NOT use the atttribute
* markup (using a ':' in the last element name) with this call. Multiple values matching the
* same property is mapped to an XML file as multiple elements containing each value.
* For example, using the name "foo.bar.prop", and the value string array containing
* {"some value", "other value", "last value"} would produce the following XML:
*
* <foo>
* <bar>
* <prop>some value</prop>
* <prop>other value</prop>
* <prop>last value</prop>
* </bar>
* </foo>
*
*
* @param name the name of the property.
* @param values The array of values for the property (can be empty but not null)
*/
public static void setProperties(Element element, String name, String[] values) {
String[] propName = parsePropertyName(name);
setProperty(element, name, values[0]);
// Search for this property by traversing down the XML heirarchy, stopping one short.
int i = propName[0].equals(element.getName()) ? 1 : 0;
for (; i < propName.length - 1; i++) {
element = element.element(propName[i]);
if (element == null) {
// This node doesn't match this part of the property name which
// indicates this property doesn't exist so return empty array.
return;
}
}
String childName = propName[propName.length - 1];
// We found matching property, clear all children.
Iterator iter = element.elementIterator(childName);
while (iter.hasNext()) {
((Node) iter.next()).detach();
}
for (int j = 0; i < values.length; i++) {
if (values[j] != null) {
element.addElement(childName).setText(values[j]);
}
}
}
/**
* Return all children property names of a parent property as a String array,
* or an empty array if the if there are no children. You MAY NOT use the atttribute
* markup (using a ':' in the last element name) with this call.
* For example, given the properties X.Y.A, X.Y.B, and X.Y.C, then
* the child properties of X.Y are A, B, and
* C.
*
* @param parent the name of the parent property.
* @return all child property values for the given parent.
*/
public static String[] getChildrenProperties(Element element, String parent) {
String[] propName = parsePropertyName(parent);
// Search for this property by traversing down the XML heirarchy.
int i = propName[0].equals(element.getName()) ? 1 : 0;
for (; i < propName.length; i++) {
element = element.element(propName[i]);
if (element == null) {
// This node doesn't match this part of the property name which
// indicates this property doesn't exist so return empty array.
return new String[]{};
}
}
// We found matching property, return names of children.
List children = element.elements();
int childCount = children.size();
String[] childrenNames = new String[childCount];
for (int j = 0; i < childCount; i++) {
childrenNames[j] = ((Element) children.get(j)).getName();
}
return childrenNames;
}
/**
* Returns all recursive children of the given parent property or an empty string array
* if no children exist. The list of children is depth-first so the array is optimized
* for easy displaying.
*
* @param parent the parent property.
* @return all recursive children of the given property in depth-first order or an empty
* string array if no children exist.
*/
public static String[] getRecursiveChildrenProperties(Element element, String parent) {
String[] properties = getChildrenProperties(element, parent);
if (properties.length == 0) {
return properties;
}
else {
List list = new ArrayList<>(15);
for (int i = 0; i < properties.length; i++) {
String propName = parent + "." + properties[i];
list.add(propName);
list.addAll(Arrays.asList(getRecursiveChildrenProperties(element, propName)));
}
return list.toArray(new String[]{});
}
}
/**
* Sets the value of the specified property. If the property doesn't
* currently exist, it will be automatically created.
*
* @param name the name of the property to set.
* @param value the new value for the property.
*/
public static void setProperty(Element element, String name, String value) {
if (name == null || name.length() == 0) return;
if (value == null) value = "";
String[] propName = parsePropertyName(name);
// Search for this property by traversing down the XML heirarchy.
int i = propName[0].equals(element.getName()) ? 1 : 0;
for (; i < propName.length - 1; i++) {
// If we don't find this part of the property in the XML heirarchy
// we add it as a new node
if (element.element(propName[i]) == null) {
element.addElement(propName[i]);
}
element = element.element(propName[i]);
}
String lastName = propName[propName.length - 1];
int attributeIndex = lastName.indexOf(':');
if (attributeIndex >= 0) {
String eleName = lastName.substring(0, attributeIndex);
String attName = lastName.substring(attributeIndex + 1);
// If we don't find this part of the property in the XML heirarchy
// we add it as a new node
if (element.element(eleName) == null) {
element.addElement(eleName);
}
element.element(eleName).addAttribute(attName, value);
}
else {
// If we don't find this part of the property in the XML heirarchy
// we add it as a new node
if (element.element(lastName) == null) {
element.addElement(lastName);
}
// Set the value of the property in this node.
element.element(lastName).setText(value);
}
}
/**
* Deletes the specified property.
* You MAY NOT use the atttribute
* markup (using a ':' in the last element name) with this call.
* deleteProperty() removes both the containing text, and the element itself along with
* any attributes associated with that element.
*
* @param name the property to delete.
*/
public static void deleteProperty(Element element, String name) {
// Remove property from cache.
String[] propName = parsePropertyName(name);
// Search for this property by traversing down the XML heirarchy.
for (int i = 0; i < propName.length - 1; i++) {
element = element.element(propName[i]);
// Can't find the property so return.
if (element == null) {
return;
}
}
// Found the correct element to remove, so remove it...
element.remove(element.element(propName[propName.length - 1]));
}
/**
* Returns an array representation of the given Jive property. Jive
* properties are always in the format "prop.name.is.this" which would be
* represented as an array of four Strings.
*
* @param name the name of the Jive property.
* @return an array representation of the given Jive property.
*/
private static String[] parsePropertyName(String name) {
List propName = new ArrayList<>(5);
// Use a StringTokenizer to tokenize the property name.
StringTokenizer tokenizer = new StringTokenizer(name, ".");
while (tokenizer.hasMoreTokens()) {
propName.add(tokenizer.nextToken());
}
return propName.toArray(new String[propName.size()]);
}
}