From 6bccfa5456ce58842d6412e30f0b4e1cb6be6f69 Mon Sep 17 00:00:00 2001
From: Vincent Hennebert <vhennebert@apache.org>
Date: Mon, 15 Mar 2010 18:36:21 +0000
Subject: [PATCH] Bugfix: NPE when there is a forced break before a table
 occurring at an IPD change

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@923380 13f79535-47bb-0310-9956-ffa450edef68
---
 .../layoutmgr/table/TableLayoutManager.java   | 18 +++++
 .../flow_changing-ipd_break-before-table.xml  | 74 +++++++++++++++++++
 2 files changed, 92 insertions(+)
 create mode 100644 test/layoutengine/standard-testcases/flow_changing-ipd_break-before-table.xml

diff --git a/src/java/org/apache/fop/layoutmgr/table/TableLayoutManager.java b/src/java/org/apache/fop/layoutmgr/table/TableLayoutManager.java
index e12839b0b..7ccab7898 100644
--- a/src/java/org/apache/fop/layoutmgr/table/TableLayoutManager.java
+++ b/src/java/org/apache/fop/layoutmgr/table/TableLayoutManager.java
@@ -43,7 +43,9 @@ import org.apache.fop.layoutmgr.ConditionalElementListener;
 import org.apache.fop.layoutmgr.KnuthElement;
 import org.apache.fop.layoutmgr.KnuthGlue;
 import org.apache.fop.layoutmgr.LayoutContext;
+import org.apache.fop.layoutmgr.LeafPosition;
 import org.apache.fop.layoutmgr.ListElement;
+import org.apache.fop.layoutmgr.Position;
 import org.apache.fop.layoutmgr.PositionIterator;
 import org.apache.fop.layoutmgr.RelSide;
 import org.apache.fop.layoutmgr.TraitSetter;
@@ -88,6 +90,8 @@ public class TableLayoutManager extends BlockStackingLayoutManager
     /** See {@link TableLayoutManager#registerColumnBackgroundArea(TableColumn, Block, int)}. */
     private List columnBackgroundAreas;
 
+    private Position auxiliaryPosition;
+
     /**
      * Temporary holder of column background informations for a table-cell's area.
      *
@@ -290,6 +294,20 @@ public class TableLayoutManager extends BlockStackingLayoutManager
         return returnList;
     }
 
+    /** {@inheritDoc} */
+    public Position getAuxiliaryPosition() {
+        /*
+         * Redefined to return a LeafPosition instead of a NonLeafPosition. The
+         * SpaceResolver.SpaceHandlingBreakPosition constructors unwraps all
+         * NonLeafPositions, which can lead to a NPE when a break in a table occurs at a
+         * page with different ipd.
+         */
+        if (auxiliaryPosition == null) {
+            auxiliaryPosition = new LeafPosition(this, 0);
+        }
+        return auxiliaryPosition;
+    }
+
     /**
      * Registers the given area, that will be used to render the part of column background
      * covered by a table-cell. If percentages are used to place the background image, the
diff --git a/test/layoutengine/standard-testcases/flow_changing-ipd_break-before-table.xml b/test/layoutengine/standard-testcases/flow_changing-ipd_break-before-table.xml
new file mode 100644
index 000000000..11496f80e
--- /dev/null
+++ b/test/layoutengine/standard-testcases/flow_changing-ipd_break-before-table.xml
@@ -0,0 +1,74 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+<!-- $Id$ -->
+<testcase>
+  <info>
+    <p>
+      Bugfix: NPE when a break-before was set on a table.
+    </p>
+  </info>
+  <fo>
+    <fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
+      <fo:layout-master-set>
+        <fo:simple-page-master master-name="narrow"
+          page-height="120pt" page-width="170pt" margin="10pt">
+          <fo:region-body background-color="#F0F0F0"/>
+        </fo:simple-page-master>
+        <fo:simple-page-master master-name="wide"
+          page-height="120pt" page-width="220pt" margin="10pt">
+          <fo:region-body background-color="#F0F0F0"/>
+        </fo:simple-page-master>
+        <fo:page-sequence-master master-name="pages">
+          <fo:single-page-master-reference master-reference="narrow"/>
+          <fo:repeatable-page-master-reference master-reference="wide"/>
+        </fo:page-sequence-master>
+      </fo:layout-master-set>
+      <fo:page-sequence master-reference="pages">
+        <fo:flow flow-name="xsl-region-body" line-height="10pt" font-size="8pt">
+          <fo:block>Before the table</fo:block>
+          <fo:table width="100%" table-layout="fixed">
+            <fo:table-body>
+              <fo:table-row>
+                <fo:table-cell border="1pt solid black">
+                  <fo:block>Cell 1.1</fo:block>
+                </fo:table-cell>
+                <fo:table-cell border="1pt solid black">
+                  <fo:block break-before="page">Cell 1.2</fo:block>
+                </fo:table-cell>
+              </fo:table-row>
+              <fo:table-row>
+                <fo:table-cell border="1pt solid black">
+                  <fo:block>Cell 2.1</fo:block>
+                </fo:table-cell>
+                <fo:table-cell border="1pt solid black">
+                  <fo:block>Cell 2.2</fo:block>
+                </fo:table-cell>
+              </fo:table-row>
+            </fo:table-body>
+          </fo:table>
+        </fo:flow>
+      </fo:page-sequence>
+    </fo:root>
+  </fo>
+  <checks>
+    <eval expected="Before the table" xpath="//pageViewport[1]//flow/block[1]//text"/>
+    <!-- Test does not really matter, just make sure document is processed successfully -->
+    <eval expected="150000"           xpath="//pageViewport[2]//flow/block[1]/@ipd"/>
+    <eval expected="22000"            xpath="//pageViewport[2]//flow/block[1]/@bpd"/>
+  </checks>
+</testcase>
-- 
2.39.5