package org.apache.lucene.index.codecs.mocksep;
/**
* 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.IOException;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.IndexInput;
import org.apache.lucene.util.CodecUtil;
import org.apache.lucene.index.codecs.sep.IntIndexInput;
/** Reads IndexInputs written with {@link
* SingleIntIndexOutput}. NOTE: this class is just for
* demonstration puprposes (it is a very slow way to read a
* block of ints).
*
* @lucene.experimental
*/
public class MockSingleIntIndexInput extends IntIndexInput {
private final IndexInput in;
public MockSingleIntIndexInput(Directory dir, String fileName, int readBufferSize)
throws IOException {
in = dir.openInput(fileName, readBufferSize);
CodecUtil.checkHeader(in, MockSingleIntIndexOutput.CODEC,
MockSingleIntIndexOutput.VERSION_START,
MockSingleIntIndexOutput.VERSION_START);
}
@Override
public Reader reader() throws IOException {
return new Reader((IndexInput) in.clone());
}
@Override
public void close() throws IOException {
in.close();
}
public static class Reader extends IntIndexInput.Reader {
// clone:
private final IndexInput in;
public Reader(IndexInput in) {
this.in = in;
}
/** Reads next single int */
@Override
public int next() throws IOException {
return in.readVInt();
}
}
class Index extends IntIndexInput.Index {
private long fp;
@Override
public void read(IndexInput indexIn, boolean absolute)
throws IOException {
if (absolute) {
fp = indexIn.readVLong();
} else {
fp += indexIn.readVLong();
}
}
@Override
public void set(IntIndexInput.Index other) {
fp = ((Index) other).fp;
}
@Override
public void seek(IntIndexInput.Reader other) throws IOException {
((Reader) other).in.seek(fp);
}
@Override
public String toString() {
return Long.toString(fp);
}
@Override
public Object clone() {
Index other = new Index();
other.fp = fp;
return other;
}
}
@Override
public Index index() {
return new Index();
}
}