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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.fastsearch;
import java.nio.ByteBuffer;
import com.yahoo.io.SlowInflate;
import com.yahoo.prelude.hitfield.JSONString;
import com.yahoo.text.Utf8;
import com.yahoo.data.access.*;
import com.yahoo.data.access.simple.Value;
/**
* A hit field containing JSON structured data
*
* @author Steinar Knutsen
*/
public class JSONField extends DocsumField implements VariableLengthField {
public JSONField(String name) {
super(name);
}
@Override
public Object decode(ByteBuffer b) {
long dataLen = 0;
long len = ((long) b.getInt()) & 0xffffffffL;
boolean compressed;
JSONString 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 = new JSONString(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 String toString() {
return "field " + getName() + " type JSONString";
}
@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;
}
private static class CompatibilityConverter {
Value.ArrayValue target = new Value.ArrayValue();
Inspector stringify(Inspector value) {
if (value.type() == Type.STRING) return value;
if (value.type() == Type.LONG) {
String str = String.valueOf(value.asLong());
return new Value.StringValue(str);
}
if (value.type() == Type.DOUBLE) {
String str = String.valueOf(value.asDouble());
return new Value.StringValue(str);
}
String str = value.toString();
return new Value.StringValue(str);
}
}
private static class ArrConv extends CompatibilityConverter implements ArrayTraverser {
@Override
public void entry(int idx, Inspector value) {
target.add(stringify(value));
}
}
private static class WsConv1 extends CompatibilityConverter
implements ArrayTraverser
{
@Override
public void entry(int idx, Inspector value) {
Value.ArrayValue obj = new Value.ArrayValue();
obj.add(stringify(value.entry(0)));
obj.add(value.entry(1));
target.add(obj);
}
}
private static class WsConv2 extends CompatibilityConverter
implements ArrayTraverser
{
@Override
public void entry(int idx, Inspector value) {
Value.ArrayValue obj = new Value.ArrayValue();
obj.add(stringify(value.field("item")));
obj.add(value.field("weight"));
target.add(obj);
}
}
static Inspector convertTop(Inspector value) {
if (value.type() == Type.ARRAY && value.entryCount() > 0) {
Inspector first = value.entry(0);
if (first.type() == Type.ARRAY && first.entryCount() == 2) {
// old style weighted set
WsConv1 conv = new WsConv1();
value.traverse(conv);
return conv.target;
}
if (first.type() == Type.OBJECT &&
first.fieldCount() == 2 &&
first.field("item").valid() &&
first.field("weight").valid())
{
// new style weighted set
WsConv2 conv = new WsConv2();
value.traverse(conv);
return conv.target;
}
if (first.type() == Type.LONG) {
ArrConv conv = new ArrConv();
value.traverse(conv);
return conv.target;
}
if (first.type() == Type.DOUBLE) {
ArrConv conv = new ArrConv();
value.traverse(conv);
return conv.target;
}
}
return value;
}
public Object convert(Inspector value) {
if (value.valid()) {
return new JSONString(convertTop(value));
} else {
return new JSONString("");
}
}
}
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