Special OutputStream decorator that suppresses calls to the close() method. This is my new approach for handling filters. Before I used the Finalizable interface (see PS renderer). But that didn't work out for the PDF library.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@196148 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/util/CloseBlockerOutputStream.java

@@ -0,0 +1,81 @@
+/*
+ * $Id$
+ * ============================================================================
+ *                    The Apache Software License, Version 1.1
+ * ============================================================================
+ * 
+ * Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without modifica-
+ * tion, 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. The end-user documentation included with the redistribution, if any, must
+ *    include the following acknowledgment: "This product includes software
+ *    developed by the Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgment may appear in the software itself, if
+ *    and wherever such third-party acknowledgments normally appear.
+ * 
+ * 4. The names "FOP" and "Apache Software Foundation" must not be used to
+ *    endorse or promote products derived from this software without prior
+ *    written permission. For written permission, please contact
+ *    apache@apache.org.
+ * 
+ * 5. Products derived from this software may not be called "Apache", nor may
+ *    "Apache" appear in their name, without prior written permission of the
+ *    Apache Software Foundation.
+ * 
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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
+ * APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
+ * DING, 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.
+ * ============================================================================
+ * 
+ * This software consists of voluntary contributions made by many individuals
+ * on behalf of the Apache Software Foundation and was originally created by
+ * James Tauber <jtauber@jtauber.com>. For more information on the Apache
+ * Software Foundation, please see <http://www.apache.org/>.
+ */ 
+package org.apache.fop.util;
+
+import java.io.FilterOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * This is a decorator to block calls to close() to the underlying stream.
+ */
+public class CloseBlockerOutputStream extends FilterOutputStream {
+
+    /**
+     * @see java.io.FilterOutputStream#FilterOutputStream(OutputStream)
+     */
+    public CloseBlockerOutputStream(OutputStream out) {
+        super(out);
+    }
+
+    /**
+     * @see java.io.OutputStream#close()
+     */
+    public void close() throws IOException {
+        //System.out.println("Not sending close() to " + out);
+        try {
+            flush();
+        } catch (IOException ioe) {
+            //ignore
+        }
+    }
+
+}