diff --git a/lucene/analysis/icu/src/java/org/apache/lucene/analysis/icu/ICUNormalizer2CharFilterFactory.java b/lucene/analysis/icu/src/java/org/apache/lucene/analysis/icu/ICUNormalizer2CharFilterFactory.java
new file mode 100644
index 00000000000..75f0206c451
--- /dev/null
+++ b/lucene/analysis/icu/src/java/org/apache/lucene/analysis/icu/ICUNormalizer2CharFilterFactory.java
@@ -0,0 +1,83 @@
+package org.apache.lucene.analysis.icu;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.io.Reader;
+import java.util.Arrays;
+import java.util.Map;
+
+import org.apache.lucene.analysis.util.AbstractAnalysisFactory;
+import org.apache.lucene.analysis.util.CharFilterFactory;
+import org.apache.lucene.analysis.util.MultiTermAwareComponent;
+
+import com.ibm.icu.text.FilteredNormalizer2;
+import com.ibm.icu.text.Normalizer2;
+import com.ibm.icu.text.UnicodeSet;
+
+/**
+ * Factory for {@link ICUNormalizer2CharFilter}
+ *
+ * Supports the following attributes:
+ *
+ * - name: A Unicode Normalization Form,
+ * one of 'nfc','nfkc', 'nfkc_cf'. Default is nfkc_cf.
+ *
- mode: Either 'compose' or 'decompose'. Default is compose. Use "decompose" with nfc
+ * or nfkc, to get nfd or nfkd, respectively.
+ *
- filter: A {@link UnicodeSet} pattern. Codepoints outside the set are
+ * always left unchanged. Default is [] (the null set, no filtering).
+ *
+ * @see ICUNormalizer2CharFilter
+ * @see Normalizer2
+ * @see FilteredNormalizer2
+ */
+public class ICUNormalizer2CharFilterFactory extends CharFilterFactory implements MultiTermAwareComponent {
+ private final Normalizer2 normalizer;
+
+ /** Creates a new ICUNormalizer2CharFilterFactory */
+ public ICUNormalizer2CharFilterFactory(Map args) {
+ super(args);
+ String name = get(args, "name", "nfkc_cf");
+ String mode = get(args, "mode", Arrays.asList("compose", "decompose"), "compose");
+ Normalizer2 normalizer = Normalizer2.getInstance
+ (null, name, "compose".equals(mode) ? Normalizer2.Mode.COMPOSE : Normalizer2.Mode.DECOMPOSE);
+
+ String filter = get(args, "filter");
+ if (filter != null) {
+ UnicodeSet set = new UnicodeSet(filter);
+ if (!set.isEmpty()) {
+ set.freeze();
+ normalizer = new FilteredNormalizer2(normalizer, set);
+ }
+ }
+ if (!args.isEmpty()) {
+ throw new IllegalArgumentException("Unknown parameters: " + args);
+ }
+ this.normalizer = normalizer;
+ }
+
+ @Override
+ public Reader create(Reader input) {
+ return new ICUNormalizer2CharFilter(input, normalizer);
+ }
+
+ @Override
+ public AbstractAnalysisFactory getMultiTermComponent() {
+ return this;
+ }
+
+}
diff --git a/lucene/analysis/icu/src/resources/META-INF/services/org.apache.lucene.analysis.util.CharFilterFactory b/lucene/analysis/icu/src/resources/META-INF/services/org.apache.lucene.analysis.util.CharFilterFactory
new file mode 100644
index 00000000000..d47f7a0a915
--- /dev/null
+++ b/lucene/analysis/icu/src/resources/META-INF/services/org.apache.lucene.analysis.util.CharFilterFactory
@@ -0,0 +1,16 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+org.apache.lucene.analysis.icu.ICUNormalizer2CharFilterFactory
diff --git a/lucene/analysis/icu/src/test/org/apache/lucene/analysis/icu/TestICUNormalizer2CharFilterFactory.java b/lucene/analysis/icu/src/test/org/apache/lucene/analysis/icu/TestICUNormalizer2CharFilterFactory.java
new file mode 100644
index 00000000000..eee19a8bffa
--- /dev/null
+++ b/lucene/analysis/icu/src/test/org/apache/lucene/analysis/icu/TestICUNormalizer2CharFilterFactory.java
@@ -0,0 +1,52 @@
+package org.apache.lucene.analysis.icu;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.io.Reader;
+import java.io.StringReader;
+import java.util.HashMap;
+
+import org.apache.lucene.analysis.BaseTokenStreamTestCase;
+import org.apache.lucene.analysis.TokenStream;
+
+/** basic tests for {@link ICUNormalizer2CharFilterFactory} */
+public class TestICUNormalizer2CharFilterFactory extends BaseTokenStreamTestCase {
+
+ /** Test nfkc_cf defaults */
+ public void testDefaults() throws Exception {
+ Reader reader = new StringReader("This is a Test");
+ ICUNormalizer2CharFilterFactory factory = new ICUNormalizer2CharFilterFactory(new HashMap());
+ reader = factory.create(reader);
+ TokenStream stream = whitespaceMockTokenizer(reader);
+ assertTokenStreamContents(stream, new String[] { "this", "is", "a", "test" });
+ }
+
+ /** Test that bogus arguments result in exception */
+ public void testBogusArguments() throws Exception {
+ try {
+ new ICUNormalizer2CharFilterFactory(new HashMap() {{
+ put("bogusArg", "bogusValue");
+ }});
+ fail();
+ } catch (IllegalArgumentException expected) {
+ assertTrue(expected.getMessage().contains("Unknown parameters"));
+ }
+ }
+
+ // TODO: add tests for different forms
+}