From 6025b6016517c6d898d8957d1d7e03ba71431912 Mon Sep 17 00:00:00 2001
From: tknall <tknall@7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c>
Date: Fri, 1 Dec 2006 12:20:24 +0000
Subject: Initial import of release 2.2.

git-svn-id: https://joinup.ec.europa.eu/svn/pdf-as/trunk@4 7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c
---
 src/main/java/org/pdfbox/cos/COSNull.java | 88 +++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 src/main/java/org/pdfbox/cos/COSNull.java

(limited to 'src/main/java/org/pdfbox/cos/COSNull.java')

diff --git a/src/main/java/org/pdfbox/cos/COSNull.java b/src/main/java/org/pdfbox/cos/COSNull.java
new file mode 100644
index 0000000..15356b5
--- /dev/null
+++ b/src/main/java/org/pdfbox/cos/COSNull.java
@@ -0,0 +1,88 @@
+/**
+ * Copyright (c) 2003-2004, www.pdfbox.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of pdfbox; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.cos;
+
+
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+import org.pdfbox.exceptions.COSVisitorException;
+
+/**
+ * This class represents a null PDF object.
+ *
+ * @author Ben Litchfield (ben@csh.rit.edu)
+ * @version $Revision: 1.12 $
+ */
+public class COSNull extends COSBase
+{
+    /**
+     * The null token.
+     */
+    public static final byte[] NULL_BYTES = new byte[] {110, 117, 108, 108}; //"null".getBytes( "ISO-8859-1" );
+    
+    /**
+     * The one null object in the system.
+     */
+    public static final COSNull NULL = new COSNull();
+
+    /**
+     * Constructor.
+     */
+    private COSNull()
+    {
+        //limit creation to one instance.
+    }
+
+    /**
+     * visitor pattern double dispatch method.
+     *
+     * @param visitor The object to notify when visiting this object.
+     * @return any object, depending on the visitor implementation, or null
+     * @throws COSVisitorException If an error occurs while visiting this object.
+     */
+    public Object accept( ICOSVisitor  visitor ) throws COSVisitorException
+    {
+        return visitor.visitFromNull( this );
+    }
+    
+    /**
+     * This will output this string as a PDF object.
+     *  
+     * @param output The stream to write to.
+     * @throws IOException If there is an error writing to the stream.
+     */
+    public void writePDF( OutputStream output ) throws IOException
+    {
+        output.write(NULL_BYTES);
+    }
+}
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