domutil.java

来自「JAVA的一些源码 JAVA2 STANDARD EDITION DEVELO」· Java 代码 · 共 770 行 · 第 1/2 页

            child = child.getNextSibling();
        }

        // not found
        return null;

    } // getFirstChildElementNS(Node,String,String):Element

    /** Finds and returns the last child node with the given qualified name. */
    public static Element getLastChildElementNS(Node parent,
                                                String uri, String localpart) {

        // search for node
        Node child = parent.getLastChild();
        while (child != null) {
            if (child.getNodeType() == Node.ELEMENT_NODE) {
                String childURI = child.getNamespaceURI();
                if (childURI != null && childURI.equals(uri) &&
                    child.getLocalName().equals(localpart)) {
                    return (Element)child;
                }
            }
            child = child.getPreviousSibling();
        }

        // not found
        return null;

    } // getLastChildElementNS(Node,String,String):Element

    /** Finds and returns the next sibling node with the given qualified name. */
    public static Element getNextSiblingElementNS(Node node,
                                                  String uri, String localpart) {

        // search for node
        Node sibling = node.getNextSibling();
        while (sibling != null) {
            if (sibling.getNodeType() == Node.ELEMENT_NODE) {
                String siblingURI = sibling.getNamespaceURI();
                if (siblingURI != null && siblingURI.equals(uri) &&
                    sibling.getLocalName().equals(localpart)) {
                    return (Element)sibling;
                }
            }
            sibling = sibling.getNextSibling();
        }

        // not found
        return null;

    } // getNextSiblingdElementNS(Node,String,String):Element

    /** Finds and returns the first child node with the given name. */
    public static Element getFirstChildElement(Node parent, String elemNames[]) {

        // search for node
        Node child = parent.getFirstChild();
        while (child != null) {
            if (child.getNodeType() == Node.ELEMENT_NODE) {
                for (int i = 0; i < elemNames.length; i++) {
                    if (child.getNodeName().equals(elemNames[i])) {
                        return (Element)child;
                    }
                }
            }
            child = child.getNextSibling();
        }

        // not found
        return null;

    } // getFirstChildElement(Node,String[]):Element

    /** Finds and returns the last child node with the given name. */
    public static Element getLastChildElement(Node parent, String elemNames[]) {

        // search for node
        Node child = parent.getLastChild();
        while (child != null) {
            if (child.getNodeType() == Node.ELEMENT_NODE) {
                for (int i = 0; i < elemNames.length; i++) {
                    if (child.getNodeName().equals(elemNames[i])) {
                        return (Element)child;
                    }
                }
            }
            child = child.getPreviousSibling();
        }

        // not found
        return null;

    } // getLastChildElement(Node,String[]):Element

    /** Finds and returns the next sibling node with the given name. */
    public static Element getNextSiblingElement(Node node, String elemNames[]) {

        // search for node
        Node sibling = node.getNextSibling();
        while (sibling != null) {
            if (sibling.getNodeType() == Node.ELEMENT_NODE) {
                for (int i = 0; i < elemNames.length; i++) {
                    if (sibling.getNodeName().equals(elemNames[i])) {
                        return (Element)sibling;
                    }
                }
            }
            sibling = sibling.getNextSibling();
        }

        // not found
        return null;

    } // getNextSiblingdElement(Node,String[]):Element

    /** Finds and returns the first child node with the given qualified name. */
    public static Element getFirstChildElementNS(Node parent,
                                                 String[][] elemNames) {

        // search for node
        Node child = parent.getFirstChild();
        while (child != null) {
            if (child.getNodeType() == Node.ELEMENT_NODE) {
                for (int i = 0; i < elemNames.length; i++) {
                    String uri = child.getNamespaceURI();
                    if (uri != null && uri.equals(elemNames[i][0]) &&
                        child.getLocalName().equals(elemNames[i][1])) {
                        return (Element)child;
                    }
                }
            }
            child = child.getNextSibling();
        }

        // not found
        return null;

    } // getFirstChildElementNS(Node,String[][]):Element

    /** Finds and returns the last child node with the given qualified name. */
    public static Element getLastChildElementNS(Node parent,
                                                String[][] elemNames) {

        // search for node
        Node child = parent.getLastChild();
        while (child != null) {
            if (child.getNodeType() == Node.ELEMENT_NODE) {
                for (int i = 0; i < elemNames.length; i++) {
                    String uri = child.getNamespaceURI();
                    if (uri != null && uri.equals(elemNames[i][0]) &&
                        child.getLocalName().equals(elemNames[i][1])) {
                        return (Element)child;
                    }
                }
            }
            child = child.getPreviousSibling();
        }

        // not found
        return null;

    } // getLastChildElementNS(Node,String[][]):Element

    /** Finds and returns the next sibling node with the given qualified name. */
    public static Element getNextSiblingElementNS(Node node,
                                                  String[][] elemNames) {

        // search for node
        Node sibling = node.getNextSibling();
        while (sibling != null) {
            if (sibling.getNodeType() == Node.ELEMENT_NODE) {
                for (int i = 0; i < elemNames.length; i++) {
                    String uri = sibling.getNamespaceURI();
                    if (uri != null && uri.equals(elemNames[i][0]) &&
                        sibling.getLocalName().equals(elemNames[i][1])) {
                        return (Element)sibling;
                    }
                }
            }
            sibling = sibling.getNextSibling();
        }

        // not found
        return null;

    } // getNextSiblingdElementNS(Node,String[][]):Element

    /**
     * Finds and returns the first child node with the given name and
     * attribute name, value pair.
     */
    public static Element getFirstChildElement(Node   parent,
                                               String elemName,
                                               String attrName,
                                               String attrValue) {

        // search for node
        Node child = parent.getFirstChild();
        while (child != null) {
            if (child.getNodeType() == Node.ELEMENT_NODE) {
                Element element = (Element)child;
                if (element.getNodeName().equals(elemName) &&
                    element.getAttribute(attrName).equals(attrValue)) {
                    return element;
                }
            }
            child = child.getNextSibling();
        }

        // not found
        return null;

    } // getFirstChildElement(Node,String,String,String):Element

    /**
     * Finds and returns the last child node with the given name and
     * attribute name, value pair.
     */
    public static Element getLastChildElement(Node   parent,
                                               String elemName,
                                               String attrName,
                                               String attrValue) {

        // search for node
        Node child = parent.getLastChild();
        while (child != null) {
            if (child.getNodeType() == Node.ELEMENT_NODE) {
                Element element = (Element)child;
                if (element.getNodeName().equals(elemName) &&
                    element.getAttribute(attrName).equals(attrValue)) {
                    return element;
                }
            }
            child = child.getPreviousSibling();
        }

        // not found
        return null;

    } // getLastChildElement(Node,String,String,String):Element

    /**
     * Finds and returns the next sibling node with the given name and
     * attribute name, value pair. Since only elements have attributes,
     * the node returned will be of type Node.ELEMENT_NODE.
     */
    public static Element getNextSiblingElement(Node   node,
                                                String elemName,
                                                String attrName,
                                                String attrValue) {

        // search for node
        Node sibling = node.getNextSibling();
        while (sibling != null) {
            if (sibling.getNodeType() == Node.ELEMENT_NODE) {
                Element element = (Element)sibling;
                if (element.getNodeName().equals(elemName) &&
                    element.getAttribute(attrName).equals(attrValue)) {
                    return element;
                }
            }
            sibling = sibling.getNextSibling();
        }

        // not found
        return null;

    } // getNextSiblingElement(Node,String,String,String):Element

    /**
     * Returns the concatenated child text of the specified node.
     * This method only looks at the immediate children of type
     * <code>Node.TEXT_NODE</code> or the children of any child
     * node that is of type <code>Node.CDATA_SECTION_NODE</code>
     * for the concatenation.
     *
     * @param node The node to look at.
     */
    public static String getChildText(Node node) {

        // is there anything to do?
        if (node == null) {
            return null;
        }

        // concatenate children text
        StringBuffer str = new StringBuffer();
        Node child = node.getFirstChild();
        while (child != null) {
            short type = child.getNodeType();
            if (type == Node.TEXT_NODE) {
                str.append(child.getNodeValue());
            }
            else if (type == Node.CDATA_SECTION_NODE) {
                str.append(getChildText(child));
            }
            child = child.getNextSibling();
        }

        // return text value
        return str.toString();

    } // getChildText(Node):String

    // return the name of this element
    public static String getName(Node node) {
        return node.getNodeName();
    } // getLocalName(Element):  String

    /** returns local name of this element if not null, otherwise
        returns the name of the node
    */
    public static String getLocalName(Node node) {
        String name = node.getLocalName();
        return (name!=null)? name:node.getNodeName();
    } // getLocalName(Element):  String

    public static Element getParent(Element elem) {
        Node parent = elem.getParentNode();
        if (parent instanceof Element)
            return (Element)parent;
        return null;
    } // getParent(Element):Element

    // get the Document of which this Node is a part
    public static Document getDocument(Node node) {
        return node.getOwnerDocument();
    } // getDocument(Node):Document

    // return this Document's root node
    public static Element getRoot(Document doc) {
        return doc.getDocumentElement();
     } // getRoot(Document(:  Element

   // some methods for handling attributes:

    // return the right attribute node
    public static Attr getAttr(Element elem, String name) {
        return elem.getAttributeNode(name);
    } // getAttr(Element, String):Attr

    // return the right attribute node
    public static Attr getAttrNS(Element elem, String nsUri,
            String localName) {
        return elem.getAttributeNodeNS(nsUri, localName);
    } // getAttrNS(Element, String):Attr

    // get all the attributes for an Element
    public static Attr[] getAttrs(Element elem) {
        NamedNodeMap attrMap = elem.getAttributes();
        Attr [] attrArray = new Attr[attrMap.getLength()];
        for (int i=0; i<attrMap.getLength(); i++)
            attrArray[i] = (Attr)attrMap.item(i);
        return attrArray;
    } // getAttrs(Element):  Attr[]

    // get attribute's value
    public static String getValue(Attr attribute) {
        return attribute.getValue();
    } // getValue(Attr):String

    // It is noteworthy that, because of the way the DOM specs
    // work, the next two methods return the empty string (not
    // null!) when the attribute with the specified name does not
    // exist on an element.  Beware!

    // return the value of the attribute of the given element
    // with the given name
    public static String getAttrValue(Element elem, String name) {
        return elem.getAttribute(name);
    } // getAttr(Element, String):Attr

    // return the value of the attribute of the given element
    // with the given name
    public static String getAttrValueNS(Element elem, String nsUri,
            String localName) {
        return elem.getAttributeNS(nsUri, localName);
    } // getAttrValueNS(Element, String):Attr

    // return the namespace URI
    public static String getNamespaceURI(Node node) {
        return node.getNamespaceURI();
    }
} // class XUtil