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/*
* $Id$
* Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
* For details on use and redistribution please refer to the
* LICENSE file included with these sources.
*/
package org.apache.fop.fo;
// FOP
import org.apache.fop.layout.Area;
import org.apache.fop.apps.FOPException;
import org.apache.fop.datatypes.IDReferences;
import org.apache.fop.fo.properties.FOPropertyMapping;
import org.xml.sax.Attributes;
/**
* base class for representation of formatting objects and their processing
*/
public class FObj extends FONode {
public PropertyList properties;
protected PropertyManager propMgr;
protected String name;
public FObj(FObj parent) {
super(parent);
}
public void setName(String str) {
name = "fo:" + str;
}
protected PropertyListBuilder getListBuilder() {
PropertyListBuilder plb = new PropertyListBuilder();
plb.addList(FOPropertyMapping.getGenericMappings());
return plb;
}
/**
* Handle the attributes for this element.
* The attributes must be used immediately as the sax attributes
* will be altered for the next element.
*/
public void handleAttrs(Attributes attlist) throws FOPException {
String uri = "http://www.w3.org/1999/XSL/Format";
properties =
getListBuilder().makeList(uri, name, attlist,
(parent == null) ? null
: parent.properties, parent);
properties.setFObj(this);
this.propMgr = makePropertyManager(properties);
setWritingMode();
}
protected PropertyManager makePropertyManager(PropertyList propertyList) {
return new PropertyManager(propertyList);
}
/**
* adds characters (does nothing here)
* @param data text
* @param start start position
* @param length length of the text
*/
protected void addCharacters(char data[], int start, int length) {
// ignore
}
/**
* generates the area or areas for this formatting object
* and adds these to the area. This method should always be
* overridden by all sub classes
*
* @param area
*/
public Status layout(Area area) throws FOPException {
// should always be overridden
return new Status(Status.OK);
}
/**
* returns the name of the formatting object
* @return the name of this formatting objects
*/
public String getName() {
return this.name;
}
/**
*
*/
protected void start() {
// do nothing by default
}
/**
*
*/
protected void end() {
// do nothing by default
}
/**
* lets outside sources access the property list
* first used by PageNumberCitation to find the "id" property
* @param name - the name of the desired property to obtain
* @return the property
*/
public Property getProperty(String name) {
return (properties.get(name));
}
/**
* Return the "content width" of the areas generated by this FO.
* This is used by percent-based properties to get the dimension of
* the containing block.
* If an FO has a property with a percentage value, that value
* is usually calculated on the basis of the corresponding dimension
* of the area which contains areas generated by the FO.
* NOTE: subclasses of FObj should implement this to return a reasonable
* value!
*/
public int getContentWidth() {
return 0;
}
/**
* removes property id
* @param idReferences the id to remove
*/
public void removeID(IDReferences idReferences) {
if (((FObj)this).properties.get("id") == null
|| ((FObj)this).properties.get("id").getString() == null)
return;
idReferences.removeID(((FObj)this).properties.get("id").getString());
int numChildren = this.children.size();
for (int i = 0; i < numChildren; i++) {
FONode child = (FONode)children.elementAt(i);
if ((child instanceof FObj)) {
((FObj)child).removeID(idReferences);
}
}
}
public boolean generatesReferenceAreas() {
return false;
}
/**
* Set writing mode for this FO.
* Find nearest ancestor, including self, which generates
* reference areas and use the value of its writing-mode property.
* If no such ancestor is found, use the value on the root FO.
*/
protected void setWritingMode() {
FObj p;
FObj parent;
for (p = this;
!p.generatesReferenceAreas() && (parent = p.getParent()) != null;
p = parent);
this.properties.setWritingMode(p.getProperty("writing-mode").getEnum());
}
}
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