Factory for StreamCache instances. Supports a hint for the expected stream size so...

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@196151 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/src/java/org/apache/fop/pdf/StreamCacheFactory.java b/src/java/org/apache/fop/pdf/StreamCacheFactory.java
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+/*
+ * $Id: StreamCache.java,v 1.3 2003/03/07 08:25:47 jeremias Exp $
+ * ============================================================================
+ *                    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.pdf;
+
+import java.io.IOException;
+
+/**
+ * This class is serves as a factory from
+ */
+public class StreamCacheFactory {
+
+    private static boolean defaultCacheToFile = false;
+    private static StreamCacheFactory fileInstance = null;
+    private static StreamCacheFactory memoryInstance = null;
+
+    private boolean cacheToFile = false;
+    
+    /**
+     * Returns an instance of a StreamCacheFactory with the requested features.
+     * @param cacheToFile True if file shall be cached using a temporary file
+     * @return StreamCacheFactory the requested factory
+     */
+    public static StreamCacheFactory getInstance(boolean cacheToFile) {
+        if (cacheToFile) {
+            if (fileInstance == null) {
+                fileInstance = new StreamCacheFactory(true);
+            }
+            return fileInstance;
+        } else {
+            if (memoryInstance == null) {
+                memoryInstance = new StreamCacheFactory(false);
+            }
+            return memoryInstance;
+        }
+    }
+    
+    /**
+     * Returns an instance of a StreamCacheFactory depending on the default
+     * setting for cacheToFile.
+     * @return StreamCacheFactory the requested factory
+     */
+    public static StreamCacheFactory getInstance() {
+        return getInstance(defaultCacheToFile);
+    }
+    
+    /**
+     * Sets the global default for cacheToFile
+     * @param cacheToFile True if stream caches should be held in files.
+     */
+    public static void setDefaultCacheToFile(boolean cacheToFile) {
+        defaultCacheToFile = cacheToFile;
+    }
+
+    /**
+     * Creates a new StreamCacheFactory.
+     * @param cacheToFile True if file shall be cached using a temporary file
+     */
+    public StreamCacheFactory(boolean cacheToFile) {
+        this.cacheToFile = cacheToFile;
+    }
+    
+    /**
+     * Get the correct implementation (based on cacheToFile) of
+     * StreamCache.
+     * @throws IOException if there is an IO error
+     * @return a new StreamCache for caching streams
+     */
+    public StreamCache createStreamCache() throws IOException {
+        if (this.cacheToFile) {
+            return new TempFileStreamCache();
+        } else {
+            return new InMemoryStreamCache();
+        }
+    }
+    
+    /**
+     * Get the correct implementation (based on cacheToFile) of
+     * StreamCache.
+     * @param hintSize a hint about the approximate expected size of the buffer
+     * @throws IOException if there is an IO error
+     * @return a new StreamCache for caching streams
+     */
+    public StreamCache createStreamCache(int hintSize) throws IOException {
+        if (this.cacheToFile) {
+            return new TempFileStreamCache();
+        } else {
+            return new InMemoryStreamCache(hintSize);
+        }
+    }
+    
+    /**
+     * Get the value of the global cacheToFile flag.
+     * @return the current cache to file flag
+     */
+    public boolean getCacheToFile() {
+        return this.cacheToFile;
+    }
+    
+
+}