1 files changed, 94 insertions, 0 deletions
diff --git a/src/proguard/io/CascadingDataEntryWriter.java b/src/proguard/io/CascadingDataEntryWriter.java
new file mode 100644
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+++ b/src/proguard/io/CascadingDataEntryWriter.java
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+/*
+ * ProGuard -- shrinking, optimization, obfuscation, and preverification
+ *             of Java bytecode.
+ *
+ * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu)
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+package proguard.io;
+
+import java.io.*;
+
+/**
+ * This DataEntryWriter delegates to a given DataEntryWriter, or failing that,
+ * to another given DataEntryWriter.
+ *
+ * @author Eric Lafortune
+ */
+public class CascadingDataEntryWriter implements DataEntryWriter
+{
+    private DataEntryWriter dataEntryWriter1;
+    private DataEntryWriter dataEntryWriter2;
+
+
+    /**
+     * Creates a new CascadingDataEntryWriter.
+     * @param dataEntryWriter1 the DataEntryWriter to which the writing will be
+     *                         delegated first.
+     * @param dataEntryWriter2 the DataEntryWriter to which the writing will be
+     *                         delegated, if the first one can't provide an
+     *                         output stream.
+     */
+    public CascadingDataEntryWriter(DataEntryWriter dataEntryWriter1,
+                                    DataEntryWriter dataEntryWriter2)
+    {
+        this.dataEntryWriter1 = dataEntryWriter1;
+        this.dataEntryWriter2 = dataEntryWriter2;
+    }
+
+
+    // Implementations for DataEntryWriter.
+
+
+    public boolean createDirectory(DataEntry dataEntry) throws IOException
+    {
+        // Try to create a directory with the first data entry writer, or
+        // otherwise with the second data entry writer.
+        return dataEntryWriter1.createDirectory(dataEntry) ||
+               dataEntryWriter2.createDirectory(dataEntry);
+    }
+
+
+    public OutputStream getOutputStream(DataEntry dataEntry) throws IOException
+    {
+        return getOutputStream(dataEntry,  null);
+    }
+
+
+    public OutputStream getOutputStream(DataEntry dataEntry,
+                                        Finisher  finisher) throws IOException
+    {
+        // Try to get an output stream from the first data entry writer.
+        OutputStream outputStream =
+            dataEntryWriter1.getOutputStream(dataEntry, finisher);
+
+        // Return it, if it's not null. Otherwise try to get an output stream
+        // from the second data entry writer.
+        return outputStream != null ?
+            outputStream :
+            dataEntryWriter2.getOutputStream(dataEntry, finisher);
+    }
+
+
+    public void close() throws IOException
+    {
+        dataEntryWriter1.close();
+        dataEntryWriter2.close();
+
+        dataEntryWriter1 = null;
+        dataEntryWriter2 = null;
+    }
+}