/*
* 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.
*/
package org.apache.lucene.analysis.fa;
import java.io.IOException;
import java.io.Reader;
import org.apache.lucene.analysis.CharFilter;
/**
* CharFilter that replaces instances of Zero-width non-joiner with an
* ordinary space.
*/
public class PersianCharFilter extends CharFilter {
public PersianCharFilter(Reader in) {
super(in);
}
@Override
public int read(char[] cbuf, int off, int len) throws IOException {
final int charsRead = input.read(cbuf, off, len);
if (charsRead > 0) {
final int end = off + charsRead;
while (off < end) {
if (cbuf[off] == '\u200C')
cbuf[off] = ' ';
off++;
}
}
return charsRead;
}
// optimized impl: some other charfilters consume with read()
@Override
public int read() throws IOException {
int ch = input.read();
if (ch == '\u200C') {
return ' ';
} else {
return ch;
}
}
@Override
protected int correct(int currentOff) {
return currentOff; // we don't change the length of the string
}
}