fixed #591 - npe in folding

org.erlide.ui/src/org/erlide/ui/internal/folding/DefaultErlangFoldingStructureProvider.java

@@ -113,7 +113,7 @@ private static final class Tuple {
 
 	/**
 	 * Filter for annotations.
-	 * 
+	 *
 	 * @since 3.2
 	 */
 	private static interface Filter {
@@ -184,7 +184,7 @@ public void elementChanged(final ElementChangedEvent e) {
 	 * Projection position that will return two foldable regions: one folding
 	 * away the region from after the '/**' to the beginning of the content, the
 	 * other from after the first content line until after the comment.
-	 * 
+	 *
 	 * @since 3.1
 	 */
 	private static final class CommentPosition extends Position implements
@@ -250,7 +250,7 @@ public IRegion[] computeProjectionRegions(final IDocument document)
 		/**
 		 * Finds the offset of the first identifier part within
 		 * <code>content</code>. Returns 0 if none is found.
-		 * 
+		 *
 		 * @param content
 		 *            the content to search
 		 * @return the first index of a unicode identifier part, or zero if none
@@ -316,7 +316,7 @@ public int computeCaptionOffset(final IDocument document) {
 	 * Projection position that will return two foldable regions: one folding
 	 * away the lines before the one containing the simple name of the erlang
 	 * element, one folding away any lines after the caption.
-	 * 
+	 *
 	 * @since 3.1
 	 */
 	private static final class ErlangElementPosition extends Position implements
@@ -481,14 +481,14 @@ public boolean match(final ErlangProjectionAnnotation annotation) {
 	/* filters */
 	/**
 	 * Member filter, matches nested members (but not top-level types).
-	 * 
+	 *
 	 * @since 3.2
 	 */
 	private final Filter fCollapseFunctionsFilter = new FunctionsFilter(false);
 
 	/**
 	 * Comment filter, matches comments.
-	 * 
+	 *
 	 * @since 3.2
 	 */
 	private final Filter fCollapseCommentsFilter = new CommentsFilter(false);
@@ -542,7 +542,7 @@ public void projectionEnabled() {
 		// message.
 		projectionDisabled();
 
-		if (fEditor instanceof ErlangEditor) {
+		if (fEditor instanceof ErlangEditor && fModule!=null) {
 			initialize();
 			fElementListener = new ElementChangedListener();
 			ErlangCore.getModelManager().addElementChangedListener(
@@ -699,7 +699,7 @@ private void computeAdditions(final IErlElement element,
 	 * than one range may be returned if the element has a leading comment which
 	 * gets folded separately. If there are no foldable regions,
 	 * <code>null</code> is returned.
-	 * 
+	 *
 	 * @param element
 	 *            the erlang element that can be folded
 	 * @return the regions to be folded, or <code>null</code> if there are none
@@ -936,7 +936,7 @@ private void match(final List<ErlangProjectionAnnotation> deletions,
 	 * If a match is found, the annotation gets removed from
 	 * <code>annotations</code>.
 	 * </p>
-	 * 
+	 *
 	 * @param tuple
 	 *            the tuple for which we want to find a match
 	 * @param annotations
@@ -1003,7 +1003,7 @@ public int compare(final Tuple o1, final Tuple o2) {
 
 	/*
 	 * (non-Javadoc)
-	 * 
+	 *
 	 * @see
 	 * org.erlide.ui.editors.erl.folding.IErlangFoldingStructureProviderExtension
 	 * #collapseFunctions()
@@ -1014,7 +1014,7 @@ public void collapseFunctions() {
 
 	/*
 	 * (non-Javadoc)
-	 * 
+	 *
 	 * @see
 	 * org.erlide.ui.editors.erl.folding.IErlangFoldingStructureProviderExtension
 	 * #collapseComments()
@@ -1025,7 +1025,7 @@ public void collapseComments() {
 
 	/*
 	 * (non-Javadoc)
-	 * 
+	 *
 	 * @see
 	 * org.erlide.ui.editors.erl.folding.IErlangFoldingStructureProviderExtension
 	 * #expandAll()
@@ -1058,7 +1058,7 @@ public void expandElements(final IErlElement[] elements) {
 
 	/**
 	 * Collapses all annotations matched by the passed filter.
-	 * 
+	 *
 	 * @param filter
 	 *            the filter to use to select which annotations to collapse
 	 * @param expand
@@ -1102,7 +1102,7 @@ private void modifyFiltered(final Filter filter, final boolean expand) {
 
 	/*
 	 * (non-Javadoc)
-	 * 
+	 *
 	 * @see
 	 * org.erlide.core.erlang.IErlModelChangeListener#elementChanged(org.erlide
 	 * .core.erlang.IErlElement)