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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.fs4;
import com.yahoo.tensor.Tensor;
import com.yahoo.tensor.serialization.TypedBinaryFormat;
import com.yahoo.text.Utf8;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* A static utility for encoding values to the binary map representation used in fs4 packets.
*
* @author bratseth
*/
public class MapEncoder {
// TODO: Time to refactor
private static final String TYPE_SUFFIX = ".type";
private static final String TENSOR_TYPE = "tensor";
/**
* Encodes a single value as a complete binary map.
* Does nothing if the value is null.
*
* Returns the number of maps encoded - 0 or 1
*/
public static int encodeSingleValue(String mapName, String key, Object value, ByteBuffer buffer) {
if (value == null) return 0;
byte [] utf8 = Utf8.toBytes(mapName);
buffer.putInt(utf8.length);
buffer.put(utf8);
buffer.putInt(1);
utf8 = Utf8.toBytes(key);
buffer.putInt(utf8.length);
buffer.put(utf8);
utf8 = Utf8.toBytes(value.toString());
buffer.putInt(utf8.length);
buffer.put(utf8);
return 1;
}
/**
* Encodes a map as binary.
* Does nothing if the value is null.
*
* Returns the number of maps encoded - 0 or 1
*/
public static int encodeMap(String mapName, Map<String,?> map, ByteBuffer buffer) {
if (map.isEmpty()) return 0;
byte [] utf8 = Utf8.toBytes(mapName);
buffer.putInt(utf8.length);
buffer.put(utf8);
buffer.putInt(map.size());
for (Map.Entry<String, ?> property : map.entrySet()) {
String key = property.getKey();
utf8 = Utf8.toBytes(key);
buffer.putInt(utf8.length);
buffer.put(utf8);
utf8 = Utf8.toBytes(property.getValue() != null ? property.getValue().toString() : "");
buffer.putInt(utf8.length);
buffer.put(utf8);
}
return 1;
}
/**
* Encodes a multi-map as binary.
* Does nothing if the value is null.
*
* Returns the number of maps encoded - 0 or 1
*/
public static int encodeStringMultiMap(String mapName, Map<String,List<String>> map, ByteBuffer buffer) {
if (map.isEmpty()) return 0;
byte [] utf8 = Utf8.toBytes(mapName);
buffer.putInt(utf8.length);
buffer.put(utf8);
buffer.putInt(countStringEntries(map));
for (Map.Entry<String, List<String>> property : map.entrySet()) {
String key = property.getKey();
for (Object value : property.getValue()) {
utf8 = Utf8.toBytes(key);
buffer.putInt(utf8.length);
buffer.put(utf8);
utf8 = Utf8.toBytes(value.toString());
buffer.putInt(utf8.length);
buffer.put(utf8);
}
}
return 1;
}
/**
* Encodes a multi-map as binary.
* Does nothing if the value is null.
*
* Returns the number of maps encoded - 0 or 1
*/
public static int encodeObjectMultiMap(String mapName, Map<String,List<Object>> map, ByteBuffer buffer) {
if (map.isEmpty()) return 0;
byte[] utf8 = Utf8.toBytes(mapName);
buffer.putInt(utf8.length);
buffer.put(utf8);
addTensorTypeInfo(map);
buffer.putInt(countObjectEntries(map));
for (Map.Entry<String, List<Object>> property : map.entrySet()) {
String key = property.getKey();
for (Object value : property.getValue()) {
utf8 = Utf8.toBytes(key);
buffer.putInt(utf8.length);
buffer.put(utf8);
if (value instanceof Tensor) {
utf8 = TypedBinaryFormat.encode((Tensor)value);
} else {
utf8 = Utf8.toBytes(value.toString());
}
buffer.putInt(utf8.length);
buffer.put(utf8);
}
}
return 1;
}
private static void addTensorTypeInfo(Map<String, List<Object>> map) {
Map<String, Tensor> tensorsToTag = new HashMap<>();
for (Map.Entry<String, List<Object>> entry : map.entrySet()) {
for (Object value : entry.getValue()) {
if (value instanceof Tensor) {
tensorsToTag.put(entry.getKey(), (Tensor)value);
}
}
}
for (Map.Entry<String, Tensor> entry : tensorsToTag.entrySet()) {
// Ensure that we only have a single tensor associated with each key
map.put(entry.getKey(), Arrays.asList(entry.getValue()));
map.put(entry.getKey() + TYPE_SUFFIX, Arrays.asList(TENSOR_TYPE));
}
}
private static int countStringEntries(Map<String, List<String>> value) {
int entries = 0;
for (Map.Entry<String, List<String>> property : value.entrySet())
entries += property.getValue().size();
return entries;
}
private static int countObjectEntries(Map<String, List<Object>> value) {
int entries = 0;
for (Map.Entry<String, List<Object>> property : value.entrySet())
entries += property.getValue().size();
return entries;
}
}
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