192 lines
6.5 KiB
Java
192 lines
6.5 KiB
Java
/*
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* Copyright (c) 2002-2004 LWJGL Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of 'LWJGL' nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.lwjgl.util.model.loaders;
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import java.util.ArrayList;
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import java.util.List;
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import org.w3c.dom.Element;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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/**
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* Some simple XML utilities
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* @author cas
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*/
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final class XMLUtil {
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/**
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* Get a single child element
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* @param child
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* @return the single child element, or null
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* @throws Exception if the child is present multiple times
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*/
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static Element getChild(Element element, String child) throws Exception {
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NodeList nodes = element.getChildNodes();
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Element ret = null;
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for (int i = 0; i < nodes.getLength(); i ++) {
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Node childNode = (Node) nodes.item(i);
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if (childNode.getNodeName().equals(child) && childNode.getNodeType() == Node.ELEMENT_NODE) {
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if (ret != null) {
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throw new Exception("Child element '"+child+"' present multiple times");
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} else {
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ret = (Element) childNode;
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}
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}
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}
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return ret;
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}
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/**
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* @param name The name of the child elements you want
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* @return a List of child Elements
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*/
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static List getChildren(Element element, String name) throws Exception {
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NodeList nodes = element.getChildNodes();
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ArrayList ret = new ArrayList(nodes.getLength());
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for (int i = 0; i < nodes.getLength(); i ++) {
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Node childNode = (Node) nodes.item(i);
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if (childNode.getNodeName().equals(name) && childNode.getNodeType() == Node.ELEMENT_NODE) {
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ret.add(childNode);
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}
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}
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return ret;
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}
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/**
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* A convenience method for getting float values out of XML elements
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* @param attribute The name of the attribute
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* @throws NumberFormatException If the supplied attribute is not a number
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* @throws Exception if the value is missing
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* @return the parsed float value
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*/
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static float getFloat(Element element, String attribute) throws Exception {
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String s = element.getAttribute(attribute);
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if (s == null || "".equals(s))
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throw new Exception("Attribute '"+attribute+"' has not been specified for "+element.getNodeName());
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else
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return Float.parseFloat(s);
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}
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/**
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* A convenience method for getting float values out of XML elements
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* @param attribute The name of the attribute
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* @param defaultValue The default value to return if no default is specified
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* @throws NumberFormatException If the supplied attribute is not a number
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* @return the parsed float value
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*/
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static float getFloat(Element element, String attribute, float defaultValue) throws Exception {
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String s = element.getAttribute(attribute);
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if (s == null || "".equals(s))
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return defaultValue;
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else
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return Float.parseFloat(s);
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}
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/**
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* A convenience method for getting integer values out of XML elements
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* @param attribute The name of the attribute
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* @throws NumberFormatException If the supplied attribute is not a number
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* @throws Exception if the value is missing
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* @return the parsed integer value
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*/
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static int getInt(Element element, String attribute) throws Exception {
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String s = element.getAttribute(attribute);
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if (s == null || "".equals(s))
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throw new Exception("Attribute '"+attribute+"' has not been specified for "+element.getNodeName());
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else
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return Integer.parseInt(s);
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}
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/**
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* A convenience method for getting integer values out of XML elements
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* @param attribute The name of the attribute
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* @param defaultValue The default value to return if no default is specified
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* @throws NumberFormatException If the supplied attribute is not a number
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* @return the parsed integer value
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*/
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static int getInt(Element element, String attribute, int defaultValue) throws Exception {
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String s = element.getAttribute(attribute);
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if (s == null || "".equals(s))
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return defaultValue;
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else
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return Integer.parseInt(s);
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}
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/**
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* A convenience method for getting string values out of XML elements
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* @param attribute The name of the attribute
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* @return the string value, which will not be null
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* @throws Exception the value is not specified
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*/
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static String getString(Element element, String attribute) throws Exception {
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String s = element.getAttribute(attribute);
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if (s == null || "".equals(s))
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throw new Exception("Attribute '"+attribute+"' has not been specified for "+element.getNodeName());
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else
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return s;
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}
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/**
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* A convenience method for getting string values out of XML elements
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* @param attribute The name of the attribute
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* @param defaultValue The default value to return if no default is specified
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* @return the string value, which will not be null
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*/
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static String getString(Element element, String attribute, String defaultValue) throws Exception {
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String s = element.getAttribute(attribute);
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if (s == null || "".equals(s))
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return defaultValue;
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else
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return s;
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}
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/**
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* @return true if the specified attribute is present and not empty or null in the element
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*/
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static boolean hasAttribute(Element element, String attribute) {
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String s = element.getAttribute(attribute);
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if (s == null || "".equals(s))
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return false;
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else
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return true;
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}
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}
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