You are viewing a plain text version of this content. The canonical link for it is here.
Posted to fop-commits@xmlgraphics.apache.org by ar...@locus.apache.org on 2000/07/11 04:59:01 UTC
cvs commit: xml-fop/src/org/apache/fop/fo XTFOTreeBuilder.java
arved 00/07/10 19:59:01
Added: src/org/apache/fop/fo XTFOTreeBuilder.java
Log:
New pagination spec
Revision Changes Path
1.1 xml-fop/src/org/apache/fop/fo/XTFOTreeBuilder.java
Index: XTFOTreeBuilder.java
===================================================================
/*-- $Id: XTFOTreeBuilder.java,v 1.1 2000/07/11 02:59:00 arved Exp $ --
============================================================================
The Apache Software License, Version 1.1
============================================================================
Copyright (C) 1999 The Apache Software Foundation. All rights reserved.
Redistribution and use in source and binary forms, with or without modifica-
tion, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
3. The end-user documentation included with the redistribution, if any, must
include the following acknowledgment: "This product includes software
developed by the Apache Software Foundation (http://www.apache.org/)."
Alternately, this acknowledgment may appear in the software itself, if
and wherever such third-party acknowledgments normally appear.
4. The names "Fop" and "Apache Software Foundation" must not be used to
endorse or promote products derived from this software without prior
written permission. For written permission, please contact
apache@apache.org.
5. Products derived from this software may not be called "Apache", nor may
"Apache" appear in their name, without prior written permission of the
Apache Software Foundation.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
This software consists of voluntary contributions made by many individuals
on behalf of the Apache Software Foundation and was originally created by
James Tauber <jt...@jtauber.com>. For more information on the Apache
Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.fop.fo;
// FOP
import org.apache.fop.layout.AreaTree;
import org.apache.fop.messaging.MessageHandler;
import org.apache.fop.apps.FOPException;
import org.apache.fop.fo.pagination.Root;
// SAX
import org.xml.sax.HandlerBase;
import org.xml.sax.SAXException;
import org.xml.sax.InputSource;
import org.xml.sax.Attributes;
// Java
import java.util.Hashtable;
import java.util.Stack;
import java.io.IOException;
/**
* SAX Handler that builds the formatting object tree.
*/
public class XTFOTreeBuilder extends HandlerBase {
/**
* table mapping element names to the makers of objects
* representing formatting objects
*/
protected Hashtable fobjTable = new Hashtable();
/**
* class that builds a property list for each formatting object
*/
protected PropertyListBuilder propertyListBuilder = new
PropertyListBuilder();
/**
* current formatting object being handled
*/
protected FObj currentFObj = null;
/**
* the root of the formatting object tree
*/
protected FObj rootFObj = null;
/**
* set of names of formatting objects encountered but unknown
*/
protected Hashtable unknownFOs = new Hashtable();
// namespace implementation ideas pinched from John Cowan
protected static class NSMap {
String prefix;
String uri;
int level;
NSMap(String prefix, String uri, int level) {
this.prefix = prefix;
this.uri = uri;
this.level = level;
}
}
protected int level = 0;
protected Stack namespaceStack = new Stack();
{
namespaceStack.push(new NSMap("xml",
"http://www.w3.org/XML/1998/namespace",
-1));
namespaceStack.push(new NSMap("", "", -1));
}
protected String findURI(String prefix) {
for (int i = namespaceStack.size() - 1; i >= 0; i--) {
NSMap nsMap = (NSMap) (namespaceStack.elementAt(i));
if (prefix.equals(nsMap.prefix)) return nsMap.uri;
}
return null;
}
protected String mapName(String name)
throws SAXException {
int colon = name.indexOf(':');
String prefix = "";
String localPart = name;
if (colon != -1) {
prefix = name.substring(0, colon);
localPart = name.substring(colon + 1);
}
String uri = findURI(prefix);
if (uri == null) {
if (prefix.equals("")) {
return name;
} else {
throw new SAXException(new FOPException("Unknown namespace prefix " + prefix));
}
}
return uri + "^" + localPart;
}
/**
* add a mapping from element name to maker.
*
* @param namespaceURI namespace URI of formatting object element
* @param localName local name of formatting object element
* @param maker Maker for class representing formatting object
*/
public void addMapping(String namespaceURI, String localName,
FObj.Maker maker) {
this.fobjTable.put(namespaceURI + "^" + localName, maker);
}
/** SAX Handler for characters */
public void characters(char data[], int start, int length) {
currentFObj.addCharacters(data, start, start + length);
}
/** SAX Handler for the end of an element */
public void endElement(
String uri, String localName, String rawName) {
currentFObj.end();
currentFObj = (FObj) currentFObj.getParent();
level--;
while (((NSMap) namespaceStack.peek()).level > level) {
namespaceStack.pop();
}
}
/** SAX Handler for the start of the document */
public void startDocument() {
MessageHandler.logln("building formatting object tree");
}
/** SAX Handler for the start of an element */
public void startElement(String uri,
String localName, String rawName, Attributes attlist)
throws SAXException {
/* the formatting object started */
FObj fobj;
/* the maker for the formatting object started */
FObj.Maker fobjMaker;
level++;
int length = attlist.getLength();
for (int i = 0; i < length; i++) {
String att = attlist.getRawName(i);
if (att.equals("xmlns")) {
namespaceStack.push( new NSMap("",
attlist.getValue(i),
level));
} else if (att.startsWith("xmlns:")) {
String value = attlist.getValue(i);
namespaceStack.push(new NSMap(att.substring(6), value,
level));
}
}
String fullName = mapName(rawName);
fobjMaker = (FObj.Maker) fobjTable.get(fullName);
if (fobjMaker == null) {
if (!this.unknownFOs.containsKey(fullName)) {
this.unknownFOs.put(fullName, "");
MessageHandler.errorln("WARNING: Unknown formatting object "
+ fullName);
}
fobjMaker = new FObjMixed.Maker(); // fall back
}
try {
PropertyList list = this.propertyListBuilder.makeList(attlist,
(currentFObj == null) ? null : currentFObj.properties);
fobj = fobjMaker.make(currentFObj, list);
} catch (FOPException e) {
throw new SAXException(e);
}
if (rootFObj == null) {
rootFObj = fobj;
if (!fobj.getName().equals("fo:root")) {
throw new SAXException(new FOPException("Root element must"
+ " be root, not "
+ fobj.getName()));
}
} else {
currentFObj.addChild(fobj);
}
currentFObj = fobj;
}
/**
* format this formatting object tree
*
* @param areaTree the area tree to format into
*/
public void format(AreaTree areaTree)
throws FOPException {
MessageHandler.logln("formatting FOs into areas");
((Root) this.rootFObj).format(areaTree);
}
}