1 files changed, 82 insertions, 0 deletions
diff --git a/core/bundles/org.eclipse.wst.sse.ui/src/org/eclipse/wst/sse/ui/internal/projection/AbstractStructuredFoldingPosition.java b/core/bundles/org.eclipse.wst.sse.ui/src/org/eclipse/wst/sse/ui/internal/projection/AbstractStructuredFoldingPosition.java
new file mode 100644
index 0000000000..3ddb47a7d4
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+++ b/core/bundles/org.eclipse.wst.sse.ui/src/org/eclipse/wst/sse/ui/internal/projection/AbstractStructuredFoldingPosition.java
@@ -0,0 +1,82 @@
+/*******************************************************************************
+ * Copyright (c) 2009 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *     
+ *******************************************************************************/
+package org.eclipse.wst.sse.ui.internal.projection;
+
+import org.eclipse.jface.text.BadLocationException;
+import org.eclipse.jface.text.IDocument;
+import org.eclipse.jface.text.IRegion;
+import org.eclipse.jface.text.Position;
+import org.eclipse.jface.text.Region;
+import org.eclipse.jface.text.source.projection.IProjectionPosition;
+
+/**
+ * Represents a single folding position in an <code>IStructuredDocument</code>
+ */
+public abstract class AbstractStructuredFoldingPosition extends Position implements IProjectionPosition {
+	
+	/**
+	 * Default constructor
+	 * 
+	 * @param offset the offset of the folding position
+	 * @param length the length of the folidng position
+	 */
+	public AbstractStructuredFoldingPosition(int offset, int length) {
+		super(offset, length);
+	}
+	
+	/**
+	 * @see org.eclipse.jface.text.source.projection.IProjectionPosition#computeCaptionOffset(org.eclipse.jface.text.IDocument)
+	 */
+	public int computeCaptionOffset(IDocument document) throws BadLocationException {
+		
+		return 0;
+	}
+	
+	/**
+	 * @see org.eclipse.jface.text.source.projection.IProjectionPosition#computeProjectionRegions(org.eclipse.jface.text.IDocument)
+	 */
+	public IRegion[] computeProjectionRegions(IDocument document) throws BadLocationException {
+		
+		int startLineNum = document.getLineOfOffset(getStartOffset()) + 1;
+		IRegion startLine = document.getLineInformation(startLineNum);
+		int endLineNum = document.getLineOfOffset(getEndOffset()) + 1;
+		IRegion endLine = document.getLineInformation(endLineNum);
+		
+		int foldOffset;			
+		int foldEndOffset;
+		
+		synchronized (this) {
+			foldOffset = startLine.getOffset();
+			if(foldOffset < offset) {
+				offset = foldOffset;
+			}
+		
+			foldEndOffset = endLine.getOffset();
+		
+			if((foldEndOffset-offset) > length) {
+				length = foldEndOffset-offset;
+			}
+		}
+		
+		return new IRegion[] {new Region(foldOffset, foldEndOffset-foldOffset)};
+	}
+	
+	/**
+	 * @return the start offset of the folding position
+	 */
+	protected abstract int getStartOffset();
+	
+	/**
+	 * @return the end offset of the folding position
+	 */
+	protected abstract int getEndOffset();
+}