package org.apache.lucene.index;
/**
* 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;
/** Used by DocumentsWriter to implemented a StringReader
* that can be reset to a new string; we use this when
* tokenizing the string value from a Field. */
final class ReusableStringReader extends Reader {
int upto;
int left;
String s;
void init(String s) {
this.s = s;
left = s.length();
this.upto = 0;
}
@Override
public int read(char[] c) {
return read(c, 0, c.length);
}
@Override
public int read(char[] c, int off, int len) {
if (left > len) {
s.getChars(upto, upto+len, c, off);
upto += len;
left -= len;
return len;
} else if (0 == left) {
// don't keep a reference (s could have been very large)
s = null;
return -1;
} else {
s.getChars(upto, upto+left, c, off);
int r = left;
left = 0;
upto = s.length();
return r;
}
}
@Override
public void close() {}
}