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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);
}
/**
* @see org.apache.fop.fo.FONode#processNode
*/
public void processNode(String elementName, Locator locator, Attributes attlist) throws FOPException {
name = elementName;
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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