Fixed regression introduced by SVN rev 1088079:

Endless loop with empty fo:inline.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1137921 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/layoutmgr/inline/LineLayoutManager.java

@@ -649,8 +649,8 @@ public class LineLayoutManager extends InlineStackingLayoutManager
 
         Paragraph lastPar = null;
 
-        InlineLevelLayoutManager curLM = (InlineLevelLayoutManager) getChildLM();
-        while (curLM != null) {
+        InlineLevelLayoutManager curLM;
+        while ((curLM = (InlineLevelLayoutManager) getChildLM()) != null) {
             List inlineElements = curLM.getNextKnuthElements(inlineLC, effectiveAlignment);
             if (inlineElements == null || inlineElements.size() == 0) {
                 /* curLM.getNextKnuthElements() returned null or an empty list;
@@ -747,7 +747,6 @@ public class LineLayoutManager extends InlineStackingLayoutManager
                     }
                 }
             } // end of loop over returnedList
-            curLM = (InlineLevelLayoutManager) getChildLM();
         }
 
         if (lastPar != null) {
@@ -1149,6 +1148,7 @@ public class LineLayoutManager extends InlineStackingLayoutManager
     }
 
     /** {@inheritDoc} */
+    @Override
     public List getChangedKnuthElements(List oldList, int alignment) {
         List<KnuthElement> returnList = new LinkedList<KnuthElement>();
         for (int p = 0; p < knuthParagraphs.size(); p++) {
@@ -1419,7 +1419,7 @@ public class LineLayoutManager extends InlineStackingLayoutManager
     private void addInlineArea(LayoutContext context, LineBreakPosition lbp,
             boolean isLastPosition) {
 
-        KnuthSequence seq = (KnuthSequence) knuthParagraphs.get(lbp.parIndex);
+        KnuthSequence seq = knuthParagraphs.get(lbp.parIndex);
         int startElementIndex = lbp.startIndex;
         int endElementIndex = lbp.getLeafPos();
 

test/layoutengine/standard-testcases/inline_empty.xml

@@ -0,0 +1,46 @@
+<?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>
+      This test checks an empty fo:inline. This used to create an endless loop
+      so we're checking that here so it doesn't happen again.
+    </p>
+  </info>
+  <fo>
+    <fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns:svg="http://www.w3.org/2000/svg">
+      <fo:layout-master-set>
+        <fo:simple-page-master master-name="normal" page-width="5in" page-height="5in">
+          <fo:region-body/>
+        </fo:simple-page-master>
+      </fo:layout-master-set>
+      <fo:page-sequence master-reference="normal" white-space-collapse="true">
+        <fo:flow flow-name="xsl-region-body">
+          <fo:block>No endless loop, please: <fo:inline/></fo:block>
+        </fo:flow>
+      </fo:page-sequence>
+    </fo:root>
+  </fo>
+  <checks>
+    <element-list category="breaker">
+      <box w="14400"/>
+      <skip>3</skip>
+    </element-list>
+  </checks>
+</testcase>