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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.apps.FOPException;
import org.apache.fop.apps.StreamRenderer;
import org.apache.fop.layout.Area;
import org.apache.fop.util.CharUtilities;
// Avalon
import org.apache.avalon.framework.logger.Logger;
import org.xml.sax.Attributes;
import java.util.ListIterator;
import java.util.NoSuchElementException;
/**
* base class for nodes in the XML tree
*
*/
abstract public class FONode {
protected FOUserAgent userAgent;
protected FONode parent;
protected String name;
protected Logger log;
protected FONode(FONode parent) {
this.parent = parent;
}
public void setName(String str) {
name = str;
}
public void setLogger(Logger logger) {
log = logger;
}
public void setUserAgent(FOUserAgent ua) {
userAgent = ua;
}
public void setStreamRenderer(StreamRenderer st) {
}
public void handleAttrs(Attributes attlist) throws FOPException {
}
/**
* returns the name of the object
* @return the name of this object
*/
public String getName() {
return this.name;
}
/**
* 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);
}
/**
*
*/
protected void start() {
// do nothing by default
}
/**
*
*/
protected void end() {
// do nothing by default
}
protected void addChild(FONode child) {
}
public FONode getParent() {
return this.parent;
}
/**
* Return an iterator over all the children of this FObj.
* @return A ListIterator.
*/
public ListIterator getChildren() {
return null;
}
/**
* Return an iterator over the object's children starting
* at the pased node.
* @param childNode First node in the iterator
* @return A ListIterator or null if childNode isn't a child of
* this FObj.
*/
public ListIterator getChildren(FONode childNode) {
return null;
}
public CharIterator charIterator() {
return new OneCharIterator(CharUtilities.CODE_EOT);
}
}
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