Java API: a first version that compiles. This is still untested.

Signed-off-by: Christoph M. Wintersteiger <cwinter@microsoft.com>

src/api/java/Log.java

@@ -0,0 +1,60 @@
+/**
+ * This file was automatically generated from Log.cs 
+ * w/ further modifications by:
+ * @author Christoph M. Wintersteiger (cwinter)
+ **/
+
+package com.Microsoft.Z3;
+
+/**
+ * Interaction logging for Z3. <remarks> Note that this is a global, static log
+ * and if multiple Context objects are created, it logs the interaction with all
+ * of them. </remarks>
+ **/
+public final class Log
+{
+    private boolean m_is_open = false;
+
+    /**
+     * Open an interaction log file. <param name="filename">the name of the file
+     * to open</param>
+     * 
+     * @return True if opening the log file succeeds, false otherwise.
+     **/
+    public boolean Open(String filename)
+    {
+        m_is_open = true;
+        return Native.openLog(filename) == 1;
+    }
+
+    /**
+     * Closes the interaction log.
+     **/
+    public void Close()
+    {
+        m_is_open = false;
+        Native.closeLog();
+    }
+
+    /**
+     * Appends the user-provided string <paramref name="s"/> to the interaction
+     * log.
+     * @throws Z3Exception 
+     **/
+    public void Append(String s) throws Z3Exception
+    {
+        if (!m_is_open)
+            throw new Z3Exception("Log cannot be closed.");
+        Native.appendLog(s);
+    }
+
+    /**
+     * Checks whether the interaction log is opened.
+     * 
+     * @return True if the interaction log is open, false otherwise.
+     **/
+    public boolean isOpen()
+    {
+        return m_is_open;
+    }
+}