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- /*
- * Copyright 1999-2004 The Apache Software Foundation.
- *
- * Licensed 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.
- */
-
- /* $Id$ */
-
- package org.apache.fop.fo;
-
- // Java
- import java.awt.geom.Point2D;
- import java.util.HashMap;
-
- import org.w3c.dom.Document;
- import org.w3c.dom.Element;
- import org.xml.sax.Attributes;
- import org.xml.sax.Locator;
- import javax.xml.parsers.DocumentBuilderFactory;
-
- // FOP
- import org.apache.fop.apps.FOPException;
-
- /**
- * Abstract class modelling generic, non-XSL-FO XML objects. Such objects are
- * stored in a DOM.
- */
- public abstract class XMLObj extends FONode {
-
- // temp reference for attributes
- private Attributes attr = null;
- /** DOM element representing this node */
- protected Element element;
- /** DOM document containing this node */
- protected Document doc;
-
- /**
- *
- * @param parent the parent formatting object
- */
- public XMLObj(FONode parent) {
- super(parent);
- }
-
- /**
- * @param str name of the element
- */
- public void setName(String str) {
- name = str;
- }
-
- /**
- * Store the attributes for this element
- * @param attlist Collection of attributes passed to us from the parser.
- * @throws FOPException for errors in the attributes
- */
- public void handleAttrs(Attributes attlist) throws FOPException {
- attr = attlist;
- }
-
- /**
- * @return DOM document representing this foreign XML
- */
- public Document getDOMDocument() {
- return doc;
- }
-
- public Point2D getDimension(Point2D view) {
- return null;
- }
-
- /**
- * @return string containing the namespace for this node
- */
- public abstract String getNameSpace();
-
- /**
- * @return string containing the namespace for this document (which is the
- * same namespace as for this node ??)
- */
- public String getDocumentNamespace() {
- return getNameSpace();
- }
-
- private static HashMap ns = new HashMap();
- static {
- ns.put("xlink", "http://www.w3.org/1999/xlink");
- }
-
- /**
- * Add an element to the DOM document
- * @param doc DOM document to which to add an element
- * @param parent the parent element of the element that is being added
- */
- public void addElement(Document doc, Element parent) {
- this.doc = doc;
- element = doc.createElementNS(getNameSpace(), name);
-
- for (int count = 0; count < attr.getLength(); count++) {
- String rf = attr.getValue(count);
- String qname = attr.getQName(count);
- int idx = qname.indexOf(":");
- if (idx == -1) {
- element.setAttribute(qname, rf);
- } else {
- String pref = qname.substring(0, idx);
- String tail = qname.substring(idx + 1);
- if (pref.equals("xmlns")) {
- ns.put(tail, rf);
- } else {
- element.setAttributeNS((String)ns.get(pref), tail, rf);
- }
- }
- }
- attr = null;
- parent.appendChild(element);
- }
-
- /**
- * Add the top-level element to the DOM document
- * @param doc DOM document
- * @param svgRoot non-XSL-FO element to be added as the root of this document
- */
- public void buildTopLevel(Document doc, Element svgRoot) {
- // build up the info for the top level element
- for (int count = 0; count < attr.getLength(); count++) {
- String rf = attr.getValue(count);
- String qname = attr.getQName(count);
- int idx = qname.indexOf(":");
- if (idx == -1) {
- element.setAttribute(qname, rf);
- } else {
- String pref = qname.substring(0, idx);
- String tail = qname.substring(idx + 1);
- if (pref.equals("xmlns")) {
- ns.put(tail, rf);
- } else {
- element.setAttributeNS((String)ns.get(pref), tail, rf);
- }
- }
- }
- }
-
- /**
- * Create an empty DOM document
- * @return DOM document
- */
- public Document createBasicDocument() {
- doc = null;
-
- element = null;
- try {
- DocumentBuilderFactory fact = DocumentBuilderFactory.newInstance();
- fact.setNamespaceAware(true);
- doc = fact.newDocumentBuilder().newDocument();
- Element el = doc.createElement(name);
- doc.appendChild(el);
-
- element = doc.getDocumentElement();
- buildTopLevel(doc, element);
- } catch (Exception e) {
- e.printStackTrace();
- }
- return doc;
- }
-
- /**
- * @param child FONode child that should be added to this node
- */
- protected void addChild(FONode child) {
- if (child instanceof XMLObj) {
- ((XMLObj)child).addElement(doc, element);
- } else {
- // in theory someone might want to embed some defined
- // xml (eg. fo) inside the foreign xml
- // they could use a different namespace
- getLogger().debug("Invalid element: " + child.getName() + " inside foreign xml markup");
- }
- }
-
- /**
- * Add parsed characters to this object
- * @param data array of characters contaning the text to add
- * @param start starting array element to add
- * @param length number of characters from the array to add
- * @param locator location in fo source file.
- */
- protected void addCharacters(char data[], int start, int length,
- Locator locator) {
- String str = new String(data, start, length - start);
- org.w3c.dom.Text text = doc.createTextNode(str);
- element.appendChild(text);
- }
-
- /**
- * This is a hook for an FOTreeVisitor subclass to be able to access
- * this object.
- * @param fotv the FOTreeVisitor subclass that can access this object.
- * @see org.apache.fop.fo.FOTreeVisitor
- */
- public void acceptVisitor(FOTreeVisitor fotv) {
- fotv.serveXMLObj(this);
- }
-
- }
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