LUCENE-1734: CharReader should delegate reset/mark/markSupported

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@791415 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/lucene/analysis/CharFilter.java

@@ -58,4 +58,16 @@ public abstract class CharFilter extends CharStream {
   public int read(char[] cbuf, int off, int len) throws IOException {
     return input.read(cbuf, off, len);
   }
+
+  public boolean markSupported(){
+    return input.markSupported();
+  }
+
+  public void mark( int readAheadLimit ) throws IOException {
+    input.mark(readAheadLimit);
+  }
+
+  public void reset() throws IOException {
+    input.reset();
+  }
 }

src/java/org/apache/lucene/analysis/CharReader.java

@@ -50,4 +50,16 @@ public final class CharReader extends CharStream {
   public int read(char[] cbuf, int off, int len) throws IOException {
     return input.read(cbuf, off, len);
   }
+
+  public boolean markSupported(){
+    return input.markSupported();
+  }
+
+  public void mark( int readAheadLimit ) throws IOException {
+    input.mark(readAheadLimit);
+  }
+
+  public void reset() throws IOException {
+    input.reset();
+  }
 }

src/java/org/apache/lucene/analysis/MappingCharFilter.java

@@ -125,16 +125,4 @@ public class MappingCharFilter extends BaseCharFilter {
     }
     return l == 0 ? -1 : l;
   }
-
-  public boolean markSupported() {
-    return false;
-  }
-
-  public void mark(int readAheadLimit) throws IOException {
-    throw new IOException("mark/reset not supported");
-  }
-
-  public void reset() throws IOException {
-    throw new IOException("mark/reset not supported");
-  }
 }

src/test/org/apache/lucene/analysis/TestMappingCharFilter.java

@@ -40,6 +40,22 @@ public class TestMappingCharFilter extends BaseTokenTestCase {
     normMap.add( "empty", "" );
   }
 
+  public void testReaderReset() throws Exception {
+    CharStream cs = new MappingCharFilter( normMap, CharReader.get( new StringReader( "x" ) ) );
+    char[] buf = new char[10];
+    int len = cs.read(buf, 0, 10);
+    assertEquals( 1, len );
+    assertEquals( 'x', buf[0]) ;
+    len = cs.read(buf, 0, 10);
+    assertEquals( -1, len );
+
+    // rewind
+    cs.reset();
+    len = cs.read(buf, 0, 10);
+    assertEquals( 1, len );
+    assertEquals( 'x', buf[0]) ;
+  }
+
   public void testNothingChange() throws Exception {
     CharStream cs = new MappingCharFilter( normMap, CharReader.get( new StringReader( "x" ) ) );
     TokenStream ts = new WhitespaceTokenizer( cs );