Added support for gzipped txlog files and org.apache.jdbm as backing

store

com.minres.scviewer.database.text/src/org/apache/jdbm/Storage.java

@@ -0,0 +1,54 @@
+package org.apache.jdbm;
+
+import java.io.*;
+import java.nio.ByteBuffer;
+
+/**
+ *
+ */
+interface Storage {
+
+    /**
+     * Bite shift used to calculate page size.
+     * If you want to modify page size, do it here.
+     *
+     *  1<<9 = 512
+     *  1<<10 = 1024
+     *  1<<11 = 2048
+     *  1<<12 = 4096
+     */
+    int PAGE_SIZE_SHIFT = 12;
+    
+    /**
+     * the lenght of single page.
+     * <p>
+     *!!! DO NOT MODIFY THI DIRECTLY !!!
+
+     */
+    int PAGE_SIZE = 1<< PAGE_SIZE_SHIFT;
+
+
+    /**
+     * use 'val & OFFSET_MASK' to quickly get offset within the page;
+     */
+    long OFFSET_MASK = 0xFFFFFFFFFFFFFFFFL >>> (64-Storage.PAGE_SIZE_SHIFT);
+
+
+    void write(long pageNumber, ByteBuffer data) throws IOException;
+
+    ByteBuffer read(long pageNumber) throws IOException;
+
+    void forceClose() throws IOException;
+
+    boolean isReadonly();
+
+    DataInputStream readTransactionLog();
+
+    void deleteTransactionLog();
+
+    void sync() throws IOException;
+
+    DataOutputStream openTransactionLog() throws IOException;
+
+    void deleteAllFiles() throws IOException;
+}