1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.text.translate;
18
19 import java.io.IOException;
20 import java.io.Writer;
21
22 /**
23 * Helper subclass to CharSequenceTranslator to remove unpaired surrogates.
24 *
25 * @since 1.0
26 */
27 public class UnicodeUnpairedSurrogateRemover extends CodePointTranslator {
28 /**
29 * Implementation of translate that throws out unpaired surrogates.
30 * {@inheritDoc}
31 */
32 @Override
33 public boolean translate(final int codepoint, final Writer out) throws IOException {
34 if (codepoint >= Character.MIN_SURROGATE && codepoint <= Character.MAX_SURROGATE) {
35 // It's a surrogate. Write nothing and say we've translated.
36 return true;
37 }
38 // It's not a surrogate. Don't translate it.
39 return false;
40 }
41 }
42