utilxml.java

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        Node node = element.getFirstChild();

        if (node != null) {
            do {
                if (node.getNodeType() == Node.ELEMENT_NODE && (childElementName == null ||
                        childElementName.equals(node.getNodeName()))) {
                    Element childElement = (Element) node;

                    elements.add(childElement);
                }
            } while ((node = node.getNextSibling()) != null);
        }
        return elements;
    }

    /** Return the first child Element with the given name; if name is null
     * returns the first element. */
    public static Element firstChildElement(Element element, String childElementName) {
        if (element == null) return null;
        // get the first element with the given name
        Node node = element.getFirstChild();

        if (node != null) {
            do {
                if (node.getNodeType() == Node.ELEMENT_NODE && (childElementName == null ||
                        childElementName.equals(node.getNodeName()))) {
                    Element childElement = (Element) node;

                    return childElement;
                }
            } while ((node = node.getNextSibling()) != null);
        }
        return null;
    }

    /** Return the first child Element with the given name; if name is null
     * returns the first element. */
    public static Element firstChildElement(Element element, String childElementName, String attrName, String attrValue) {
        if (element == null) return null;
        // get the first element with the given name
        Node node = element.getFirstChild();

        if (node != null) {
            do {
                if (node.getNodeType() == Node.ELEMENT_NODE && (childElementName == null ||
                        childElementName.equals(node.getNodeName()))) {
                    Element childElement = (Element) node;

                    String value = childElement.getAttribute(attrName);

                    if (value != null && value.equals(attrValue)) {
                        return childElement;
                    }
                }
            } while ((node = node.getNextSibling()) != null);
        }
        return null;
    }

    /** Return the text (node value) contained by the named child node. */
    public static String childElementValue(Element element, String childElementName) {
        if (element == null) return null;
        // get the value of the first element with the given name
        Element childElement = firstChildElement(element, childElementName);

        return elementValue(childElement);
    }

    /** Return the text (node value) contained by the named child node or a default value if null. */
    public static String childElementValue(Element element, String childElementName, String defaultValue) {
        if (element == null) return defaultValue;
        // get the value of the first element with the given name
        Element childElement = firstChildElement(element, childElementName);
        String elementValue = elementValue(childElement);

        if (elementValue == null || elementValue.length() == 0)
            return defaultValue;
        else
            return elementValue;
    }

    /** Return the text (node value) of the first node under this, works best if normalized. */
    public static String elementValue(Element element) {
        if (element == null) return null;
        // make sure we get all the text there...
        element.normalize();
        Node textNode = element.getFirstChild();

        if (textNode == null) return null;

        StringBuffer valueBuffer = new StringBuffer();
        do {
            if (textNode.getNodeType() == Node.CDATA_SECTION_NODE || textNode.getNodeType() == Node.TEXT_NODE) {
                valueBuffer.append(textNode.getNodeValue());
            }
        } while ((textNode = textNode.getNextSibling()) != null);
        return valueBuffer.toString();
    }

    public static String checkEmpty(String string) {
        if (string != null && string.length() > 0)
            return string;
        else
            return "";
    }

    public static String checkEmpty(String string1, String string2) {
        if (string1 != null && string1.length() > 0)
            return string1;
        else if (string2 != null && string2.length() > 0)
            return string2;
        else
            return "";
    }

    public static String checkEmpty(String string1, String string2, String string3) {
        if (string1 != null && string1.length() > 0)
            return string1;
        else if (string2 != null && string2.length() > 0)
            return string2;
        else if (string3 != null && string3.length() > 0)
            return string3;
        else
            return "";
    }

    public static boolean checkBoolean(String str) {
        return checkBoolean(str, false);
    }

    public static boolean checkBoolean(String str, boolean defaultValue) {
        if (defaultValue) {
            //default to true, ie anything but false is true
            return !"false".equals(str);
        } else {
            //default to false, ie anything but true is false
            return "true".equals(str);
        }
    }

    /**
     * Local entity resolver to handle J2EE DTDs. With this a http connection
     * to sun is not needed during deployment.
     * Function boolean hadDTD() is here to avoid validation errors in
     * descriptors that do not have a DOCTYPE declaration.
     */
    public static class LocalResolver implements EntityResolver {

        private boolean hasDTD = false;
        private EntityResolver defaultResolver;

        public LocalResolver(EntityResolver defaultResolver) {
            this.defaultResolver = defaultResolver;
        }

        /**
         * Returns DTD inputSource. If DTD was found in the dtds Map and inputSource was created
         * flag hasDTD is set to true.
         * @param publicId - Public ID of DTD
         * @param systemId - System ID of DTD
         * @return InputSource of DTD
         */
        public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException {
            hasDTD = false;
            String dtd = UtilProperties.getSplitPropertyValue(UtilURL.fromResource("localdtds.properties"), publicId);

            if (Debug.verboseOn()) Debug.logVerbose("[UtilXml.LocalResolver.resolveEntity] resolving DTD with publicId [" + publicId +
                    "], systemId [" + systemId + "] and the dtd file is [" + dtd + "]", module);
            if (dtd != null && dtd.length() > 0) {
                try {
                    URL dtdURL = UtilURL.fromResource(dtd);
                    InputStream dtdStream = dtdURL.openStream();
                    InputSource inputSource = new InputSource(dtdStream);

                    inputSource.setPublicId(publicId);
                    hasDTD = true;
                    if (Debug.verboseOn()) Debug.logVerbose("[UtilXml.LocalResolver.resolveEntity] got LOCAL DTD input source with publicId [" +
                            publicId + "] and the dtd file is [" + dtd + "]", module);
                    return inputSource;
                } catch (Exception e) {
                    Debug.logWarning(e, module);
                }
            }
            if (Debug.verboseOn()) Debug.logVerbose("[UtilXml.LocalResolver.resolveEntity] local resolve failed for DTD with publicId [" +
                    publicId + "] and the dtd file is [" + dtd + "], trying defaultResolver", module);
            return defaultResolver.resolveEntity(publicId, systemId);
        }

        /**
         * Returns the boolean value to inform id DTD was found in the XML file or not
         * @return boolean - true if DTD was found in XML
         */
        public boolean hasDTD() {
            return hasDTD;
        }
    }


    /** Local error handler for entity resolver to DocumentBuilder parser.
     * Error is printed to output just if DTD was detected in the XML file.
     */
    public static class LocalErrorHandler implements ErrorHandler {

        private String docDescription;
        private LocalResolver localResolver;

        public LocalErrorHandler(String docDescription, LocalResolver localResolver) {
            this.docDescription = docDescription;
            this.localResolver = localResolver;
        }

        public void error(SAXParseException exception) {
            if (localResolver.hasDTD()) {
                Debug.logError("XmlFileLoader: File "
                    + docDescription
                    + " process error. Line: "
                    + String.valueOf(exception.getLineNumber())
                    + ". Error message: "
                    + exception.getMessage(), module
                );
            }
        }

        public void fatalError(SAXParseException exception) {
            if (localResolver.hasDTD()) {
                Debug.logError("XmlFileLoader: File "
                    + docDescription
                    + " process fatal error. Line: "
                    + String.valueOf(exception.getLineNumber())
                    + ". Error message: "
                    + exception.getMessage(), module
                );
            }
        }

        public void warning(SAXParseException exception) {
            if (localResolver.hasDTD()) {
                Debug.logError("XmlFileLoader: File "
                    + docDescription
                    + " process warning. Line: "
                    + String.valueOf(exception.getLineNumber())
                    + ". Error message: "
                    + exception.getMessage(), module
                );
            }
        }
    }
}