org.apache.beehive.controls.system.ejb.internal.DomUtils Maven / Gradle / Ivy
/*
* 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.
*
* $Header:$
*/
package org.apache.beehive.controls.system.ejb.internal;
import java.util.ArrayList;
import java.util.List;
import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
/**
* Some simple DOM utility methods.
*/
final class DomUtils {
/**
* Returns the first child element with the given name. Returns
* null if not found.
*
* @param parent parent element
* @param name name of the child element
* @return child element
*/
static Element getChildElementByName(Element parent, String name) {
NodeList children = parent.getChildNodes();
for (int i = 0; i < children.getLength(); i++) {
Node node = children.item(i);
if (node.getNodeType() == Node.ELEMENT_NODE) {
Element element = (Element) node;
if (element.getTagName().equals(name)) {
return element;
}
}
}
return null;
}
/**
* Returns a list of child elements with the given
* name. Returns an empty list if there are no such child
* elements.
*
* @param parent parent element
* @param name name of the child element
* @return child elements
*/
static List getChildElementsByName(Element parent, String name) {
List elements = new ArrayList();
NodeList children = parent.getChildNodes();
for (int i = 0; i < children.getLength(); i++) {
Node node = children.item(i);
if (node.getNodeType() == Node.ELEMENT_NODE) {
Element element = (Element) node;
if (element.getTagName().equals(name)) {
elements.add(element);
}
}
}
return elements;
}
/**
* Returns the text value of a child element. Returns
* null if there is no child element found.
*
* @param parent parent element
* @param name name of the child element
* @return text value
*/
static String getChildElementText(Element parent, String name) {
// Get children
List list = DomUtils.getChildElementsByName(parent, name);
if (list.size() == 1) {
Element child = (Element) list.get(0);
StringBuffer buf = new StringBuffer();
NodeList children = child.getChildNodes();
for (int i = 0; i < children.getLength(); i++) {
Node node = children.item(i);
if (node.getNodeType() == Node.TEXT_NODE ||
node.getNodeType() == Node.CDATA_SECTION_NODE) {
Text text = (Text) node;
buf.append(text.getData().trim());
}
}
return buf.toString();
} else {
return null;
}
}
/**
* Returns the text value of a child element. Returns
* null if there is no child element found.
*
* @param element element
* @return text value
*/
static String getElementText(Element element) {
StringBuffer buf = new StringBuffer();
NodeList children = element.getChildNodes();
for (int i = 0; i < children.getLength(); i++) {
Node node = children.item(i);
if (node.getNodeType() == Node.TEXT_NODE ||
node.getNodeType() == Node.CDATA_SECTION_NODE) {
Text text = (Text) node;
buf.append(text.getData().trim());
}
}
return buf.toString();
}
/**
* Returns an array of text values of a child element. Returns
* null if there is no child element found.
*
* @param parent parent element
* @param name name of the child element
* @return text value
*/
static String[] getChildElementTextArr(Element parent, String name) {
// Get all the elements
List children = getChildElementsByName(parent, name);
String str[] = new String[children.size()];
for (int i = 0; i < children.size(); i++) {
Node child = (Node) children.get(i);
StringBuffer buf = new StringBuffer();
NodeList nodes = child.getChildNodes();
for (int j = 0; j < nodes.getLength(); j++) {
Node node = nodes.item(j);
if (node.getNodeType() == Node.TEXT_NODE ||
node.getNodeType() == Node.CDATA_SECTION_NODE) {
Text text = (Text) node;
buf.append(text.getData().trim());
}
}
str[i] = buf.toString();
}
return str;
}
/**
* Retutns the value of the named attribute of the given
* element. If there is no such attribute, returns null.
*
* @param element element
* @param name name
* @return value
*/
static String getAttributeValue(Element element, String name) {
Attr attribute = element.getAttributeNode(name);
if (attribute == null) {
return null;
} else {
return attribute.getValue();
}
}
}