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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* Class representing a long string field in the result set.
*
*/
package com.yahoo.prelude.fastsearch;
import java.nio.ByteBuffer;
import com.yahoo.io.SlowInflate;
import com.yahoo.text.Utf8;
import com.yahoo.data.access.Inspector;
/**
* @author Bjørn Borud
*/
public class LongstringField extends DocsumField implements VariableLengthField {
public LongstringField(String name) {
super(name);
}
@Override
public Object decode(ByteBuffer b) {
long dataLen = 0;
long len = ((long) b.getInt()) & 0xffffffffL;
boolean compressed;
String field;
// if MSB is set this is a compressed field. set the compressed
// flag accordingly and decompress the data
compressed = ((len & 0x80000000) != 0);
if (compressed) {
len &= 0x7fffffff;
dataLen = b.getInt();
len -= 4;
}
byte[] tmp = new byte[(int) len];
b.get(tmp);
if (compressed) {
SlowInflate inf = new SlowInflate();
tmp = inf.unpack(tmp, (int) dataLen);
}
field = Utf8.toString(tmp);
return field;
}
@Override
public Object decode(ByteBuffer b, FastHit hit) {
Object field = decode(b);
hit.setField(name, field);
return field;
}
@Override
public int getLength(ByteBuffer b) {
int offset = b.position();
// MSB = compression flag, re decode
int len = b.getInt() & 0x7fffffff;
b.position(offset + len + (Integer.SIZE >> 3));
return len + (Integer.SIZE >> 3);
}
@Override
public boolean isCompressed(ByteBuffer b) {
int offset = b.position();
// MSB = compression flag, re decode
int compressed = b.getInt() & 0x80000000;
b.position(offset);
return compressed != 0;
}
@Override
public int sizeOfLength() {
return Integer.SIZE >> 3;
}
@Override
public Object convert(Inspector value) {
return value.asString("");
}
}
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