-/*
- * $Id$
- * 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.fo.FOTree;
+import org.apache.fop.fo.FOAttributes;
+import org.apache.fop.fo.FObjects;
+import org.apache.fop.fo.expr.PropertyException;
+import org.apache.fop.fo.expr.PropertyParser;
+import org.apache.fop.fo.expr.PropertyValue;
+import org.apache.fop.fo.expr.PropertyValueList;
+import org.apache.fop.datastructs.Tree;
+import org.apache.fop.datastructs.SyncedCircularBuffer;
import org.apache.fop.apps.FOPException;
-import org.apache.fop.layout.Area;
-import org.apache.fop.layout.AreaClass;
-import org.apache.fop.layout.LinkSet;
-import org.apache.fop.system.BufferManager;
-import org.apache.fop.fo.flow.Marker;
+import org.apache.fop.xml.XMLEvent;
-// Java
-import java.util.Vector;
-import java.util.Hashtable;
+import org.xml.sax.Attributes;
-/**
- * base class for nodes in the formatting object tree
+import java.util.LinkedList;
+import java.util.ArrayList;
+
+/*
+ * FONode.java
+ * Created: Sat Nov 10 01:39:37 2001
*
- * Modified by Mark Lillywhite mark-fop@inomial.com. Made
- * Vector a protected member. (/me things this should be
- * a private member with an API for adding children;
- * this woudl save a lot of memory because the Vector
- * would not have to be instantiated unless the node had
- * children).
+ * 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.
+ *
+ * @author <a href="mailto:pbwest@powerup.com.au">Peter B. West</a>
+ * @version $Revision$ $Name$
+ */
+/**
+ * Class for nodes in the FO tree.
*/
-abstract public class FONode {
-
- protected FObj parent;
-
- protected String areaClass = AreaClass.UNASSIGNED;
-
- public BufferManager bufferManager;
-
- protected Vector children = new Vector(); // made public for searching for id's
-
- /**
- * value of marker before layout begins
- */
- public final static int START = -1000;
-
- /**
- * value of marker after break-after
- */
- public final static int BREAK_AFTER = -1001;
-
- /**
- * where the layout was up to.
- * for FObjs it is the child number
- * for FOText it is the character number
- */
- protected int marker = START;
-
- protected boolean isInTableCell = false;
-
- protected int forcedStartOffset = 0;
- protected int forcedWidth = 0;
-
- protected int widows = 0;
- protected int orphans = 0;
-
- protected LinkSet linkSet;
-
- // count of areas generated-by/returned-by
- public int areasGenerated = 0;
-
- // markers
- protected Hashtable markers;
-
- protected FONode(FObj parent) {
- this.parent = parent;
- if (parent != null) {
- this.bufferManager = parent.bufferManager;
- }
-
- markers = new Hashtable();
-
- if (null != parent)
- this.areaClass = parent.areaClass;
- }
-
- public void setIsInTableCell() {
- this.isInTableCell = true;
- // made recursive by Eric Schaeffer
- for (int i = 0; i < this.children.size(); i++) {
- FONode child = (FONode)this.children.elementAt(i);
- child.setIsInTableCell();
- }
- }
-
- public void forceStartOffset(int offset) {
- this.forcedStartOffset = offset;
- // made recursive by Eric Schaeffer
- for (int i = 0; i < this.children.size(); i++) {
- FONode child = (FONode)this.children.elementAt(i);
- child.forceStartOffset(offset);
- }
- }
-
- public void forceWidth(int width) {
- this.forcedWidth = width;
- // made recursive by Eric Schaeffer
- for (int i = 0; i < this.children.size(); i++) {
- FONode child = (FONode)this.children.elementAt(i);
- child.forceWidth(width);
- }
- }
-
- public void resetMarker() {
- this.marker = START;
- int numChildren = this.children.size();
- for (int i = 0; i < numChildren; i++) {
- ((FONode)children.elementAt(i)).resetMarker();
- }
- }
-
- public void setWidows(int wid) {
- widows = wid;
- }
-
- public void setOrphans(int orph) {
- orphans = orph;
- }
-
- public void removeAreas() {
- // still to do
- }
-
-
- protected void addChild(FONode child) {
- children.addElement(child);
- }
-
- public FObj getParent() {
- return this.parent;
- }
-
- public void setBufferManager(BufferManager bufferManager) {
- this.bufferManager = bufferManager;
- }
-
- public BufferManager getBufferManager() {
- return this.bufferManager;
- }
-
- public void setLinkSet(LinkSet linkSet) {
- this.linkSet = linkSet;
- for (int i = 0; i < this.children.size(); i++) {
- FONode child = (FONode)this.children.elementAt(i);
- child.setLinkSet(linkSet);
- }
- }
-
- public LinkSet getLinkSet() {
- return this.linkSet;
- }
- abstract public Status layout(Area area) throws FOPException;
+public class FONode extends FOTree.Node{
/**
- * lets outside sources access the property list
- * first used by PageNumberCitation to find the "id" property
- * returns null by default, overide this function when there is a property list
- * @param name - the name of the desired property to obtain
- * @returns the property
+ * Constants for the set of attributes of interest with this FONode
*/
- public Property getProperty(String name) {
- return (null);
- }
+ public static final int
+ NONE = 0
+ ,ROOT = 1
+ ,LAYOUT = 2
+ ,FLOW = 3
+ ;
+
+ /** The <tt>FOTree</tt> of which this node is a member. */
+ protected FOTree foTree;
+ /** The <tt>XMLEvent</tt> which triggered this node. */
+ protected XMLEvent event;
+ /** The buffer from which parser events are drawn. */
+ protected SyncedCircularBuffer xmlevents;
+ /** The array of property value stacks */
+ protected LinkedList[] propertyStacks;
+ /** The attributes defined on this node. */
+ public FOAttributes foAttributes;
+ /** The property expression parser in the FOTree. */
+ protected PropertyParser exprParser;
/**
- * At the start of a new span area layout may be partway through a
- * nested FO, and balancing requires rollback to this known point.
- * The snapshot records exactly where layout is at.
- * @param snapshot a Vector of markers (Integer)
- * @returns the updated Vector of markers (Integers)
+ * @param foTree an <tt>FOTree</tt> to which this node belongs
+ * @param parent an <tt>FONode</tt>, the parent node of this node in
+ * <i>foTree</i>
+ * @param event the <tt>XMLEvent</tt> that triggered the creation of this
+ * node
*/
- public Vector getMarkerSnapshot(Vector snapshot) {
- snapshot.addElement(new Integer(this.marker));
-
- // terminate if no kids or child not yet accessed
- if (this.marker < 0)
- return snapshot;
- else if (children.isEmpty())
- return snapshot;
- else
- return ((FONode)children.elementAt(this.marker)).getMarkerSnapshot(snapshot);
- }
-
- /**
- * When balancing occurs, the flow layout() method restarts at the
- * point specified by the current marker snapshot, which is retrieved
- * and restored using this method.
- * @param snapshot the Vector of saved markers (Integers)
- */
- public void rollback(Vector snapshot) {
- this.marker = ((Integer)snapshot.elementAt(0)).intValue();
- snapshot.removeElementAt(0);
-
- if (this.marker == START) {
- // make sure all the children of this FO are also reset
- resetMarker();
- return;
- } else if ((this.marker == -1) || children.isEmpty())
- return;
-
- int numChildren = this.children.size();
-
- if (this.marker <= START) {
- return;
- }
-
- for (int i = this.marker + 1; i < numChildren; i++) {
- FONode fo = (FONode)children.elementAt(i);
- fo.resetMarker();
+ public FONode (FOTree foTree, FONode parent, XMLEvent event, int attrSet)
+ throws Tree.TreeException, FOPException, PropertyException
+ {
+ foTree.super(parent);
+ this.foTree = foTree;
+ this.event = event;
+ xmlevents = foTree.xmlevents;
+ propertyStacks = foTree.propertyStacks;
+ exprParser = foTree.exprParser;
+ foAttributes = new FOAttributes(event);
+ // Process the FOAttributes - parse and stack the values
+ // font-size is always done first
+ String value = foAttributes.getFoAttrValue("font-size");
+ if (value != null) { // font-size is defined in the attributes
+ // parse the expression
+ exprParser.resetParser();
+ PropertyValue props =
+ exprParser.parse(PropNames.FONT_SIZE, value);
+ // font-size must be a single property value, which may be
+ // a percentage
+ if (props instanceof PropertyValueList)
+ throw new PropertyException
+ ("font-size requires single PropertyValue in " +
+ "PropertyValueList");
+
}
- ((FONode)children.elementAt(this.marker)).rollback(snapshot);
- }
-
-
- public void addMarker(Marker marker) throws FOPException {
- String mcname = marker.getMarkerClassName();
- if (!markers.containsKey(mcname) && children.isEmpty())
- markers.put(mcname, marker);
- else
- throw new FOPException("fo:marker must be an initial child,"
- + "and 'marker-class-name' must be unique for same parent");
- }
-
- public boolean hasMarkers() {
- return !markers.isEmpty();
- }
-
- public Vector getMarkers() {
- return new Vector(markers.values());
}
-}
+}// FONode
projects / xmlgraphics-fop.git / commitdiff