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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.flow;
// FOP
import org.apache.fop.fo.*;
import org.apache.fop.messaging.MessageHandler;
import org.apache.fop.fo.properties.*;
import org.apache.fop.layout.*;
import org.apache.fop.datatypes.*;
import org.apache.fop.apps.FOPException;
// Java
import java.util.Vector;
public class RetrieveMarker extends FObjMixed {
private String retrieveClassName;
private int retrievePosition;
private int retrieveBoundary;
public static class Maker extends FObj.Maker {
public FObj make(FObj parent,
PropertyList propertyList) throws FOPException {
return new RetrieveMarker(parent, propertyList);
}
}
public static FObj.Maker maker() {
return new RetrieveMarker.Maker();
}
public RetrieveMarker(FObj parent, PropertyList propertyList) {
super(parent, propertyList);
this.name = "fo:retrieve-marker";
this.retrieveClassName =
this.properties.get("retrieve-class-name").getString();
this.retrievePosition =
this.properties.get("retrieve-position").getEnum();
this.retrieveBoundary =
this.properties.get("retrieve-boundary").getEnum();
}
public Status layout(Area area) throws FOPException {
// locate qualifying areas by 'marker-class-name' and
// 'retrieve-boundary'. Initially we will always check
// the containing page
Page containingPage = area.getPage();
Marker bestMarker = searchPage(containingPage, true);
// if marker not yet found, and 'retrieve-boundary' permits,
// search forward by Page
if ((null == bestMarker)
&& (retrieveBoundary != RetrieveBoundary.PAGE)) {
// System.out.println("Null bestMarker and searching...");
Page currentPage = containingPage;
boolean isFirstCall = true;
while (bestMarker == null) {
Page previousPage = locatePreviousPage(currentPage,
retrieveBoundary,
isFirstCall);
isFirstCall = false;
// System.out.println("Previous page = '" + previousPage + "'");
bestMarker = searchPage(previousPage, false);
currentPage = previousPage;
}
}
Status status = new Status(Status.AREA_FULL_NONE);
if (null != bestMarker) {
// System.out.println("Laying out marker '" + bestMarker + "' in area '" + area + "'");
// the 'markers' referred to in this method are internal; they have
// nothing to do with fo:marker
bestMarker.resetMarker();
status = bestMarker.layoutMarker(area);
}
return status;
}
private Marker searchPage(Page page,
boolean isContainingPage) throws FOPException {
Vector pageMarkers = page.getMarkers();
if (pageMarkers.isEmpty()) {
// System.out.println("No markers on page");
return null;
}
// if no longer the containing page (fo:retrieve-marker, or the page
// being processed), grab the last qualifying marker on this one
if (!isContainingPage) {
for (int c = pageMarkers.size(); c > 0; c--) {
Marker currentMarker = (Marker)pageMarkers.elementAt(c - 1);
if (currentMarker.getMarkerClassName().equals(retrieveClassName)) {
return currentMarker;
}
}
}
// search forward if 'first-starting-within-page' or
// 'first-including-carryover'
if (retrievePosition == RetrievePosition.FIC) {
for (int c = 0; c < pageMarkers.size(); c++) {
Marker currentMarker = (Marker)pageMarkers.elementAt(c);
if (currentMarker.getMarkerClassName().equals(retrieveClassName)) {
return currentMarker;
}
}
} else if (retrievePosition == RetrievePosition.FSWP) {
for (int c = 0; c < pageMarkers.size(); c++) {
Marker currentMarker = (Marker)pageMarkers.elementAt(c);
if (currentMarker.getMarkerClassName().equals(retrieveClassName)) {
if (currentMarker.getRegistryArea().isFirst()) {
return currentMarker;
}
}
}
} else if (retrievePosition == RetrievePosition.LSWP) {
for (int c = pageMarkers.size(); c > 0; c--) {
Marker currentMarker = (Marker)pageMarkers.elementAt(c - 1);
if (currentMarker.getMarkerClassName().equals(retrieveClassName)) {
if (currentMarker.getRegistryArea().isFirst()) {
return currentMarker;
}
}
}
} else if (retrievePosition == RetrievePosition.LEWP) {
for (int c = pageMarkers.size(); c > 0; c--) {
Marker currentMarker = (Marker)pageMarkers.elementAt(c - 1);
if (currentMarker.getMarkerClassName().equals(retrieveClassName)) {
if (currentMarker.getRegistryArea().isLast()) {
return currentMarker;
}
}
}
} else {
throw new FOPException("Illegal 'retrieve-position' value");
}
return null;
}
private Page locatePreviousPage(Page page, int retrieveBoundary,
boolean isFirstCall) {
boolean pageWithinSequence = true;
if (retrieveBoundary == RetrieveBoundary.DOCUMENT)
pageWithinSequence = false;
return page.getAreaTree().getPreviousPage(page, pageWithinSequence,
isFirstCall);
}
}
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