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Apache CXF example source code file (W3CDOMStreamReader.java)

This example Apache CXF source code file (W3CDOMStreamReader.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Apache CXF tags/keywords

arraylist, attr, cdata, dom, element, elementframe, elementframe, node, node, override, override, qname, string, string, util, w3cdomstreamreader

The Apache CXF W3CDOMStreamReader.java source code

/**
 * 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.
 */
package org.apache.cxf.staxutils;

import java.util.ArrayList;

import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.stream.Location;
import javax.xml.stream.XMLStreamException;

import org.w3c.dom.Attr;

import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentFragment;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.Text;
import org.w3c.dom.TypeInfo;

import org.apache.cxf.helpers.DOMUtils;
import org.apache.cxf.staxutils.AbstractDOMStreamReader.ElementFrame;

public class W3CDOMStreamReader extends AbstractDOMStreamReader<Node, Node> {
    private Node content;

    private Document document;

    private W3CNamespaceContext context;
    
    private String sysId;

    /**
     * @param element
     */
    public W3CDOMStreamReader(Element element) {
        super(new ElementFrame<Node, Node>(element, null));
        content = element;
        newFrame(getCurrentFrame());
                
        this.document = element.getOwnerDocument();
    }
    public W3CDOMStreamReader(Element element, String systemId) {
        this(element);
        sysId = systemId;
    }
    public W3CDOMStreamReader(Document doc) {
        super(new ElementFrame<Node, Node>(doc, false) {
            public boolean isDocument() {
                return true;
            }
        });
        this.document = doc;
    }
    public W3CDOMStreamReader(DocumentFragment docfrag) {
        super(new ElementFrame<Node, Node>(docfrag, true) {
            public boolean isDocumentFragment() {
                return true;
            }
        });
        this.document = docfrag.getOwnerDocument();
    }

    /**
     * Get the document associated with this stream.
     * 
     * @return
     */
    public Document getDocument() {
        return document;
    }
    public String getSystemId() {
        return sysId == null ? document.getDocumentURI() : sysId;
    }
    /**
     * Find name spaces declaration in atrributes and move them to separate
     * collection.
     */
    @Override
    protected final void newFrame(ElementFrame<Node, Node> frame) {
        Node element = getCurrentNode();
        frame.uris = new ArrayList<String>();
        frame.prefixes = new ArrayList<String>();
        frame.attributes = new ArrayList<Object>();

        if (context == null) {
            context = new W3CNamespaceContext();
        }
        if (element instanceof Element) {
            context.setElement((Element)element);
        }

        NamedNodeMap nodes = element.getAttributes();

        String ePrefix = element.getPrefix();
        if (ePrefix == null) {
            ePrefix = "";
        }

        if (nodes != null) {
            for (int i = 0; i < nodes.getLength(); i++) {
                Node node = nodes.item(i);
                String prefix = node.getPrefix();
                String localName = node.getLocalName();
                String value = node.getNodeValue();
                String name = node.getNodeName();

                if (prefix == null) {
                    prefix = "";
                }

                if (name != null && "xmlns".equals(name)) {
                    frame.uris.add(value);
                    frame.prefixes.add("");
                } else if (prefix.length() > 0 && "xmlns".equals(prefix)) {
                    frame.uris.add(value);
                    frame.prefixes.add(localName);
                } else if (name.startsWith("xmlns:")) {
                    prefix = name.substring(6);
                    frame.uris.add(value);
                    frame.prefixes.add(prefix);
                } else {
                    frame.attributes.add(node);
                }
            }
        }
    }

    @Override
    protected void endElement() {
        super.endElement();
    }

    public final Node getCurrentNode() {
        return (Node)getCurrentFrame().element;
    }
    public final Element getCurrentElement() {
        return (Element)getCurrentFrame().element;
    }

    @Override
    protected ElementFrame<Node, Node> getChildFrame() {
        return new ElementFrame<Node, Node>(getCurrentFrame().currentChild, 
                                getCurrentFrame());
    }

    @Override
    protected boolean hasMoreChildren() {
        if (getCurrentFrame().currentChild == null) {
            return getCurrentNode().getFirstChild() != null;            
        }
        return ((Node)getCurrentFrame().currentChild).getNextSibling() != null;
    }

    @Override
    protected int nextChild() {
        ElementFrame<Node, Node> frame = getCurrentFrame();
        if (frame.currentChild == null) {
            content = getCurrentNode().getFirstChild();            
        } else {
            content = ((Node)frame.currentChild).getNextSibling();
        }
        
        frame.currentChild = content;
        switch (content.getNodeType()) {
        case Node.ELEMENT_NODE:
            return START_ELEMENT;
        case Node.TEXT_NODE:
            return CHARACTERS;
        case Node.COMMENT_NODE:
            return COMMENT;
        case Node.CDATA_SECTION_NODE:
            return CDATA;
        case Node.ENTITY_REFERENCE_NODE:
            return ENTITY_REFERENCE;
        default:
            throw new IllegalStateException("Found type: " + content.getClass().getName());
        }
    }

    @Override
    public String getElementText() throws XMLStreamException {
        String result = DOMUtils.getRawContent(content);

        ElementFrame<Node, Node> frame = getCurrentFrame();
        frame.ended = true;
        currentEvent = END_ELEMENT;
        endElement();

        // we should not return null according to the StAx API javadoc
        return result != null ? result : "";
    }

    @Override
    public String getNamespaceURI(String prefix) {
        ElementFrame<Node, Node> frame = getCurrentFrame();

        while (null != frame) {
            int index = frame.prefixes.indexOf(prefix);
            if (index != -1) {
                return frame.uris.get(index);
            }

            if (frame.parent == null && frame.getElement() instanceof Element) {
                return ((Element)frame.getElement()).lookupNamespaceURI(prefix);
            }
            frame = frame.parent;
        }

        return null;
    }

    public String getAttributeValue(String ns, String local) {
        Attr at;
        if (ns == null || ns.equals("")) {
            at = getCurrentElement().getAttributeNode(local);
        } else {
            at = getCurrentElement().getAttributeNodeNS(ns, local);
        }

        if (at == null) {
            return null;
        }
        return at.getNodeValue();
    }

    public int getAttributeCount() {
        return getCurrentFrame().attributes.size();
    }

    Attr getAttribute(int i) {
        return (Attr)getCurrentFrame().attributes.get(i);
    }

    private String getLocalName(Attr attr) {

        String name = attr.getLocalName();
        if (name == null) {
            name = attr.getNodeName();
        }
        return name;
    }

    public QName getAttributeName(int i) {
        Attr at = getAttribute(i);

        String prefix = at.getPrefix();
        String ln = getLocalName(at);
        // at.getNodeName();
        String ns = at.getNamespaceURI();

        if (prefix == null) {
            return new QName(ns, ln);
        } else {
            return new QName(ns, ln, prefix);
        }
    }

    public String getAttributeNamespace(int i) {
        return getAttribute(i).getNamespaceURI();
    }

    public String getAttributeLocalName(int i) {
        Attr attr = getAttribute(i);
        return getLocalName(attr);
    }

    public String getAttributePrefix(int i) {
        return getAttribute(i).getPrefix();
    }

    public String getAttributeType(int i) {
        Attr attr = getAttribute(i);
        if (attr.isId()) {
            return "ID";
        }
        TypeInfo schemaType = null;
        try {
            schemaType = attr.getSchemaTypeInfo();
        } catch (Throwable t) {
            //DOM level 2?
            schemaType = null;
        }
        return (schemaType == null) ? "CDATA" 
            : schemaType.getTypeName() == null ? "CDATA" : schemaType.getTypeName();
    }


    public String getAttributeValue(int i) {
        return getAttribute(i).getValue();
    }

    public boolean isAttributeSpecified(int i) {
        return getAttribute(i).getValue() != null;
    }

    public int getNamespaceCount() {
        return getCurrentFrame().prefixes.size();
    }

    public String getNamespacePrefix(int i) {
        return getCurrentFrame().prefixes.get(i);
    }

    public String getNamespaceURI(int i) {
        return getCurrentFrame().uris.get(i);
    }

    public NamespaceContext getNamespaceContext() {
        return context;
    }

    public String getText() {
        if (content instanceof Text) {
            return ((Text)content).getData();
        } else if (content instanceof Comment) {
            return ((Comment)content).getData();
        }
        return DOMUtils.getRawContent(getCurrentNode());
    }

    public char[] getTextCharacters() {
        return getText().toCharArray();
    }

    public int getTextStart() {
        return 0;
    }

    public int getTextLength() {
        return getText().length();
    }

    public String getEncoding() {
        return null;
    }

    public QName getName() {
        Node el = getCurrentNode();

        String prefix = getPrefix();
        String ln = getLocalName();

        if (prefix == null) {
            return new QName(el.getNamespaceURI(), ln);
        } else {
            return new QName(el.getNamespaceURI(), ln, prefix);
        }
    }

    public String getLocalName() {
        String ln = getCurrentNode().getLocalName();
        if (ln == null) {
            ln = getCurrentNode().getNodeName();
        }
        return ln;
    }

    public String getNamespaceURI() {
        String ln = getCurrentNode().getLocalName();
        if (ln == null) {
            ln = getCurrentNode().getNodeName();
            if (ln.indexOf(":") == -1) {
                ln = getNamespaceURI("");
            } else {
                ln = getNamespaceURI(ln.substring(0, ln.indexOf(":")));
            }
            return ln;
        }
        return getCurrentNode().getNamespaceURI();
    }

    public String getPrefix() {
        String prefix = getCurrentNode().getPrefix();
        if (prefix == null) {
            prefix = "";
        }
        return prefix;
    }

    public String getPITarget() {
        throw new UnsupportedOperationException();
    }

    public String getPIData() {
        throw new UnsupportedOperationException();
    }   
    public Location getLocation() {
        try {
            Object o = getCurrentNode().getUserData("location");
            if (o instanceof Location) { 
                return (Location)o;
            }
        } catch (Exception ex) {
            //ignore, probably not DOM level 3
        }
        return super.getLocation();
    }

    
}

Other Apache CXF examples (source code examples)

Here is a short list of links related to this Apache CXF W3CDOMStreamReader.java source code file:

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