From 697ee8afba76f6e2b82920bd81ed92f22ba054e1 Mon Sep 17 00:00:00 2001
From: Alan Liu <alansliu@gmail.com>
Date: Thu, 6 Jan 2000 17:38:25 +0000
Subject: [PATCH] Add null transliterator

X-SVN-Rev: 491
---
 .../com/ibm/icu/text/NullTransliterator.java  | 43 +++++++++++++++++++
 .../src/com/ibm/icu/text/Transliterator.java  |  5 ++-
 .../src/com/ibm/text/NullTransliterator.java  | 43 +++++++++++++++++++
 icu4j/src/com/ibm/text/Transliterator.java    |  5 ++-
 4 files changed, 94 insertions(+), 2 deletions(-)
 create mode 100755 icu4j/src/com/ibm/icu/text/NullTransliterator.java
 create mode 100755 icu4j/src/com/ibm/text/NullTransliterator.java

diff --git a/icu4j/src/com/ibm/icu/text/NullTransliterator.java b/icu4j/src/com/ibm/icu/text/NullTransliterator.java
new file mode 100755
index 0000000000..cf469e82b5
--- /dev/null
+++ b/icu4j/src/com/ibm/icu/text/NullTransliterator.java
@@ -0,0 +1,43 @@
+package com.ibm.text;
+import java.util.*;
+
+/**
+ * A transliterator that leaves text unchanged.
+ */
+public class NullTransliterator extends Transliterator {
+    private static final String COPYRIGHT =
+        "\u00A9 IBM Corporation 2000. All rights reserved.";
+
+    /**
+     * Package accessible ID for this transliterator.
+     */
+    static String _ID = "Null";
+
+    /**
+     * Constructs a transliterator.
+     */
+    public NullTransliterator() {
+        super(_ID, null);
+    }
+
+    /**
+     * Transliterates a segment of a string.  <code>Transliterator</code> API.
+     * @param text the string to be transliterated
+     * @param start the beginning index, inclusive; <code>0 <= start
+     * <= limit</code>.
+     * @param limit the ending index, exclusive; <code>start <= limit
+     * <= text.length()</code>.
+     * @return the new limit index
+     */
+    public int transliterate(Replaceable text, int start, int limit) {
+        return limit;
+    }
+
+    /**
+     * Implements {@link Transliterator#handleKeyboardTransliterate}.
+     */
+    protected void handleKeyboardTransliterate(Replaceable text,
+                                               int[] offsets) {
+        offsets[CURSOR] = offsets[LIMIT];
+    }
+}
diff --git a/icu4j/src/com/ibm/icu/text/Transliterator.java b/icu4j/src/com/ibm/icu/text/Transliterator.java
index 61c83d2a91..ef159ce1e7 100755
--- a/icu4j/src/com/ibm/icu/text/Transliterator.java
+++ b/icu4j/src/com/ibm/icu/text/Transliterator.java
@@ -198,7 +198,7 @@ import java.text.MessageFormat;
  * <p>Copyright &copy; IBM Corporation 1999.  All rights reserved.
  *
  * @author Alan Liu
- * @version $RCSfile: Transliterator.java,v $ $Revision: 1.5 $ $Date: 2000/01/06 01:36:36 $
+ * @version $RCSfile: Transliterator.java,v $ $Revision: 1.6 $ $Date: 2000/01/06 17:38:25 $
  */
 public abstract class Transliterator {
     /**
@@ -880,9 +880,12 @@ public abstract class Transliterator {
             }
         } catch (MissingResourceException e) {}
 
+        // Register non-rule-based transliterators
         registerClass(HexToUnicodeTransliterator._ID,
                       HexToUnicodeTransliterator.class);
         registerClass(UnicodeToHexTransliterator._ID,
                       UnicodeToHexTransliterator.class);
+        registerClass(NullTransliterator._ID,
+                      NullTransliterator.class);
     }
 }
diff --git a/icu4j/src/com/ibm/text/NullTransliterator.java b/icu4j/src/com/ibm/text/NullTransliterator.java
new file mode 100755
index 0000000000..cf469e82b5
--- /dev/null
+++ b/icu4j/src/com/ibm/text/NullTransliterator.java
@@ -0,0 +1,43 @@
+package com.ibm.text;
+import java.util.*;
+
+/**
+ * A transliterator that leaves text unchanged.
+ */
+public class NullTransliterator extends Transliterator {
+    private static final String COPYRIGHT =
+        "\u00A9 IBM Corporation 2000. All rights reserved.";
+
+    /**
+     * Package accessible ID for this transliterator.
+     */
+    static String _ID = "Null";
+
+    /**
+     * Constructs a transliterator.
+     */
+    public NullTransliterator() {
+        super(_ID, null);
+    }
+
+    /**
+     * Transliterates a segment of a string.  <code>Transliterator</code> API.
+     * @param text the string to be transliterated
+     * @param start the beginning index, inclusive; <code>0 <= start
+     * <= limit</code>.
+     * @param limit the ending index, exclusive; <code>start <= limit
+     * <= text.length()</code>.
+     * @return the new limit index
+     */
+    public int transliterate(Replaceable text, int start, int limit) {
+        return limit;
+    }
+
+    /**
+     * Implements {@link Transliterator#handleKeyboardTransliterate}.
+     */
+    protected void handleKeyboardTransliterate(Replaceable text,
+                                               int[] offsets) {
+        offsets[CURSOR] = offsets[LIMIT];
+    }
+}
diff --git a/icu4j/src/com/ibm/text/Transliterator.java b/icu4j/src/com/ibm/text/Transliterator.java
index 61c83d2a91..ef159ce1e7 100755
--- a/icu4j/src/com/ibm/text/Transliterator.java
+++ b/icu4j/src/com/ibm/text/Transliterator.java
@@ -198,7 +198,7 @@ import java.text.MessageFormat;
  * <p>Copyright &copy; IBM Corporation 1999.  All rights reserved.
  *
  * @author Alan Liu
- * @version $RCSfile: Transliterator.java,v $ $Revision: 1.5 $ $Date: 2000/01/06 01:36:36 $
+ * @version $RCSfile: Transliterator.java,v $ $Revision: 1.6 $ $Date: 2000/01/06 17:38:25 $
  */
 public abstract class Transliterator {
     /**
@@ -880,9 +880,12 @@ public abstract class Transliterator {
             }
         } catch (MissingResourceException e) {}
 
+        // Register non-rule-based transliterators
         registerClass(HexToUnicodeTransliterator._ID,
                       HexToUnicodeTransliterator.class);
         registerClass(UnicodeToHexTransliterator._ID,
                       UnicodeToHexTransliterator.class);
+        registerClass(NullTransliterator._ID,
+                      NullTransliterator.class);
     }
 }