1 files changed, 87 insertions, 0 deletions

diff --git a/src/cuchaz/enigma/mapping/SignatureUpdater.java b/src/cuchaz/enigma/mapping/SignatureUpdater.java
new file mode 100644
index 0000000..4c0dbac
--- /dev/null
+++ b/src/cuchaz/enigma/mapping/SignatureUpdater.java
@@ -0,0 +1,87 @@
+/*******************************************************************************
+ * Copyright (c) 2014 Jeff Martin.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the GNU Public License v3.0
+ * which accompanies this distribution, and is available at
+ * http://www.gnu.org/licenses/gpl.html
+ * 
+ * Contributors:
+ *     Jeff Martin - initial API and implementation
+ ******************************************************************************/
+package cuchaz.enigma.mapping;
+
+import java.io.IOException;
+import java.io.StringReader;
+
+public class SignatureUpdater
+{
+        public interface ClassNameUpdater
+        {
+                String update( String className );
+        }
+        
+        public static String update( String signature, ClassNameUpdater updater )
+        {
+                try
+                {
+                        StringBuilder buf = new StringBuilder();
+                        
+                        // read the signature character-by-character
+                        StringReader reader = new StringReader( signature );
+                        int i = -1;
+                        while( ( i = reader.read() ) != -1 )
+                        {
+                                char c = (char)i;
+                                
+                                // does this character start a class name?
+                                if( c == 'L' )
+                                {
+                                        // update the class name and add it to the buffer
+                                        buf.append( 'L' );
+                                        String className = readClass( reader );
+                                        if( className == null )
+                                        {
+                                                throw new IllegalArgumentException( "Malformed signature: " + signature );
+                                        }
+                                        buf.append( updater.update( className ) );
+                                        buf.append( ';' );
+                                }
+                                else
+                                {
+                                        // copy the character into the buffer
+                                        buf.append( c );
+                                }
+                        }
+                        
+                        return buf.toString();
+                }
+                catch( IOException ex )
+                {
+                        // I'm pretty sure a StringReader will never throw one of these
+                        throw new Error( ex );
+                }
+        }
+        
+        private static String readClass( StringReader reader )
+        throws IOException
+        {
+                // read all the characters in the buffer until we hit a ';'
+                StringBuilder buf = new StringBuilder();
+                int i = -1;
+                while( ( i = reader.read() ) != -1 )
+                {
+                        char c = (char)i;
+                        
+                        if( c == ';' )
+                        {
+                                return buf.toString();
+                        }
+                        else
+                        {
+                                buf.append( c );
+                        }
+                }
+                
+                return null;
+        }
+}