Java Node.ELEMENT_NODE屬性代碼示例

@Override
public <T> T process(T xml, Iterable<Effect> effects) throws XmlBuilderException {
    if (!canHandle(xml)) {
        throw new IllegalArgumentException("XML model is not supported");
    }
    final Node xmlNode = (Node) xml;
    final Dom4jNode<?> node;
    switch (xmlNode.getNodeType()) {
        case Node.DOCUMENT_NODE:
            node = new Dom4jDocument((Document) xmlNode);
            break;
        case Node.ELEMENT_NODE:
            node = new Dom4jElement((Element) xmlNode);
            break;
        case Node.ATTRIBUTE_NODE:
            node = new Dom4jAttribute((Attribute) xmlNode);
            break;
        default:
            throw new IllegalArgumentException("XML node type is not supported");
    }
    final Navigator<Dom4jNode> navigator = new Dom4jNavigator(xmlNode);
    for (Effect effect : effects) {
        effect.perform(navigator, node);
    }
    return xml;
}
 

/**
 *  Return true if the specified node is an Element and has either a
 *  sub-element, or an attribute (even if they are empty), OR content.
 *
 * @param  xpath  xpath to the node to be evaluated for children
 * @return        true if sub-elements, or attributes, false otherwise or if
 *      node is not an Element
 */
public boolean hasChildren(String xpath) {
	// prtln ("\nhasChildren: " + xpath);
	if (xpath == null || xpath.trim().length() == 0)
		return false;
	Node node = doc.selectSingleNode(xpath);
	if (node == null) {
		prtlnErr("\thasChildren() could not find node: (" + xpath + ")");
		return false;
	}

	if (node.getNodeType() != Node.ELEMENT_NODE) {
		prtlnErr("hasChildern() called with an non-Element - returning false");
		return false;
	}

	Element e = (Element) node;

	// we used to check for "hasText" but why would we want to do that here???
	/*
		We DO want to check in the case of an element that can contain text which ALSO
		has attributes. So we can do this check IF the typeDef is the right kind ...
	*/
	boolean hasText = (e.getTextTrim() != null && e.getTextTrim().length() > 0);
	if (hasText)
		return true;

	return (e.elements().size() > 0 ||
		e.attributeCount() > 0);
}
 

/**
 *  Returns true if an element (recursively) has no textual content, no
 *  children, and no attributes with values.<p>
 *
 *  Note: returns FALSE if no node exists at the given path.
 *
 * @param  xpath  Description of the Parameter
 * @return        true if empty, false if any errors are encountered
 */
public boolean isEmpty(String xpath) {
	Node node = doc.selectSingleNode(xpath);
	String msg = "";

	// return FALSE if a node is not found (this is kind of a wierd convention?)
	if (node == null) {
		msg = " ... couldn't find node at " + xpath + " returning FALSE";
		// prtlnErr(msg);
		return false;
	}

	if (node.getNodeType() == Node.ATTRIBUTE_NODE) {
		String content = node.getText();
		// return (content == null || content.trim().length() == 0);

		// 2/28/07 - no longer ignore whitespace!
		return (content == null || content.length() == 0);
	}

	if (node.getNodeType() != Node.ELEMENT_NODE) {
		msg = "  ...  called with an unknown type of node - returning false";
		// prtlnErr(msg);
		return false;
	}

	boolean ret = Dom4jUtils.isEmpty((Element) node);
	return ret;
}
 

/**
 *  Return true if the node specified by key exists in the instance document
 *  and it has a required attribute in the instance document.
 *
 * @param  key  a jsp-encoded xpath
 * @return      The nodeExistsWithRequiredAttribute value
 */
public String getNodeExistsWithRequiredAttribute(String key) {
	String xpath = XPathUtils.decodeXPath(key);
	Node node = docMap.selectSingleNode(xpath);
	if (node == null) {
		return FALSE;
	}
	if (node.getNodeType() != Node.ELEMENT_NODE) {
		return FALSE;
	}
	Element element = (Element) node;
	if (element.attributes().isEmpty()) {
		return FALSE;
	}

	/* check attributes for a required one */
	for (Iterator i = element.attributeIterator(); i.hasNext(); ) {
		Attribute attribute = (Attribute) i.next();
		String attPath = xpath + "/@" + attribute.getQualifiedName();
		SchemaNode schemaNode = this.schemaHelper.getSchemaNode(attPath);
		if (schemaNode == null) {
			// prtln ("schemaNode not found for attribute (" + attPath + ")");
			continue;
		}
		if (schemaNode.isRequired())
			return TRUE;
	}
	return FALSE;
}
 

@Override
public void prependCopy(Dom4jNode node) throws XmlBuilderException {
    final Node wrappedNode = node.getNode();
    if (Node.ELEMENT_NODE != wrappedNode.getNodeType()) {
        throw new XmlBuilderException("Unable to copy non-element node " + node);
    }
    final Element parent = wrappedNode.getParent();
    if (null == parent) {
        throw new XmlBuilderException("Unable to prepend - no parent found of " + node);
    }
    final int prependIndex = parent.indexOf(wrappedNode);
    final Element copiedNode = ((Element) wrappedNode).createCopy();
    parent.elements().add(prependIndex, copiedNode);
}
 

/**
 *  Description of the Method
 *
 *@param  e  Description of the Parameter
 */
private void init(Element e) {
	// prtln ("init with:\n" + e.asXML());
	if (validatingType == null) {
		// validatingType = typeDef;
		validatingType = findValidatingType(getTypeDef());
	}
	setIsChoiceMember();
	attMap = new HashMap();
	propMap = new HashMap();
	String nodeTypeString = e.getName();

	if (nodeTypeString.equals("element") || nodeTypeString.equals ("any")) {
		nodeType = Node.ELEMENT_NODE;
		
		minOccurs = SchemaHelper.getMinOccurs(e);
		maxOccurs = SchemaHelper.getMaxOccurs(e);
		// prtln ("minOccurs: " + minOccurs + "  maxOccurs: " + maxOccurs);
		
		String nillable = e.attributeValue("nillable", SchemaHelper.NILLABLE_DEFAULT);
		if ((nillable != null) && (nillable.trim().length() > 0)) {
			attMap.put("nillable", nillable);
		}

		if (e.attributeValue("fixed", null) != null) {
			readOnly = true;
		}
		
		attMap.put ("substitutionGroup", e.attributeValue("substitutionGroup", ""));
		attMap.put ("abstract", e.attributeValue("abstract", ""));
	}

	else if (nodeTypeString.equals("attribute")) {
		nodeType = Node.ATTRIBUTE_NODE;
		String use = e.attributeValue("use");
		if ((use != null) && (use.trim().length() > 0)) {
			attMap.put("use", use);
		}
	}
	else {
		nodeType = Node.UNKNOWN_NODE;
	}
	
	if (schemaDocAware)
		extractDocumentation (e);
	
	// prtln ("Instantiated SchemaNode\n" + toString());
}
 

protected void writeElement(Element element) throws IOException {
    int size = element.nodeCount();
    String qualifiedName = element.getQualifiedName();

    writePrintln();
    indent();

    writer.write("<");
    writer.write(qualifiedName);

    boolean textOnly = true;

    for (int i = 0; i < size; i++) {
        Node node = element.node(i);
        if (node instanceof Element) {
            textOnly = false;
        } else if (node instanceof Comment) {
            textOnly = false;
        }
    }

    writeAttributes(element);

    lastOutputNodeType = Node.ELEMENT_NODE;

    if (size <= 0) {
        writeEmptyElementClose(qualifiedName);
    } else {
        writer.write(">");

        if (textOnly) {
            // we have at least one text node so lets assume
            // that its non-empty
            writeElementContent(element);
        } else {
        	if (element.attributeCount() > 3)
        		writePrintln();
            // we know it's not null or empty from above
            ++indentLevel;

            writeElementContent(element);

            --indentLevel;

            writePrintln();
            indent();
        }

        writer.write("</");
        writer.write(qualifiedName);
        writer.write(">");
    }
   	if (element.attributeCount() > 2 && indentLevel > 0)
   		writePrintln();

    lastOutputNodeType = Node.ELEMENT_NODE;
}
 

/**
 *  Gets the element attribute of the SchemaNode object
 *
 *@return    The element value
 */
public boolean isElement() {
	return (getNodeType() == Node.ELEMENT_NODE);
}