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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.document.json.readers;
import com.fasterxml.jackson.core.JsonToken;
import com.google.common.base.Preconditions;
import com.yahoo.document.ArrayDataType;
import com.yahoo.document.CollectionDataType;
import com.yahoo.document.DataType;
import com.yahoo.document.Field;
import com.yahoo.document.MapDataType;
import com.yahoo.document.WeightedSetDataType;
import com.yahoo.document.datatypes.CollectionFieldValue;
import com.yahoo.document.datatypes.FieldValue;
import com.yahoo.document.datatypes.IntegerFieldValue;
import com.yahoo.document.datatypes.MapFieldValue;
import com.yahoo.document.json.TokenBuffer;
import com.yahoo.document.update.MapValueUpdate;
import com.yahoo.document.update.ValueUpdate;
import static com.yahoo.document.json.readers.JsonParserHelpers.expectArrayStart;
import static com.yahoo.document.json.readers.JsonParserHelpers.expectObjectEnd;
import static com.yahoo.document.json.readers.JsonParserHelpers.expectObjectStart;
import static com.yahoo.document.json.readers.SingleValueReader.readAtomic;
import static com.yahoo.document.json.readers.SingleValueReader.readSingleUpdate;
import static com.yahoo.document.json.readers.SingleValueReader.readSingleValue;
public class MapReader {
public static final String MAP_KEY = "key";
public static final String MAP_VALUE = "value";
public static final String UPDATE_ELEMENT = "element";
public static final String UPDATE_MATCH = "match";
public static void fillMap(TokenBuffer buffer, MapFieldValue parent, boolean ignoreUndefinedFields) {
if (buffer.current() == JsonToken.START_ARRAY) {
MapReader.fillMapFromArray(buffer, parent, ignoreUndefinedFields);
} else {
MapReader.fillMapFromObject(buffer, parent, ignoreUndefinedFields);
}
}
@SuppressWarnings({ "rawtypes", "cast", "unchecked" })
public static void fillMapFromArray(TokenBuffer buffer, MapFieldValue parent, boolean ignoreUndefinedFields) {
JsonToken token = buffer.current();
int initNesting = buffer.nesting();
expectArrayStart(token);
token = buffer.next();
DataType keyType = parent.getDataType().getKeyType();
DataType valueType = parent.getDataType().getValueType();
while (buffer.nesting() >= initNesting) {
FieldValue key = null;
FieldValue value = null;
expectObjectStart(token);
token = buffer.next();
for (int i = 0; i < 2; ++i) {
if (MAP_KEY.equals(buffer.currentName())) {
key = readSingleValue(buffer, keyType, ignoreUndefinedFields);
} else if (MAP_VALUE.equals(buffer.currentName())) {
value = readSingleValue(buffer, valueType, ignoreUndefinedFields);
}
token = buffer.next();
}
Preconditions.checkState(key != null && value != null, "Missing key or value for map entry.");
parent.put(key, value);
expectObjectEnd(token);
token = buffer.next(); // array end or next entry
}
}
@SuppressWarnings({ "rawtypes", "cast", "unchecked" })
public static void fillMapFromObject(TokenBuffer buffer, MapFieldValue parent, boolean ignoreUndefinedFields) {
JsonToken token = buffer.current();
int initNesting = buffer.nesting();
expectObjectStart(token);
token = buffer.next();
DataType keyType = parent.getDataType().getKeyType();
DataType valueType = parent.getDataType().getValueType();
while (buffer.nesting() >= initNesting) {
FieldValue key = readAtomic(buffer.currentName(), keyType);
FieldValue value = readSingleValue(buffer, valueType, ignoreUndefinedFields);
Preconditions.checkState(key != null && value != null, "Missing key or value for map entry.");
parent.put(key, value);
token = buffer.next();
}
expectObjectEnd(token);
}
@SuppressWarnings({ "rawtypes", "unchecked" })
public static ValueUpdate createMapUpdate(TokenBuffer buffer,
DataType currentLevel,
FieldValue keyParent,
FieldValue topLevelKey,
boolean ignoreUndefinedFields) {
TokenBuffer.Token element = buffer.prefetchScalar(UPDATE_ELEMENT);
if (UPDATE_ELEMENT.equals(buffer.currentName())) {
buffer.next();
}
FieldValue key = keyTypeForMapUpdate(element, currentLevel);
if (keyParent != null) {
((CollectionFieldValue) keyParent).add(key);
}
// structure is: [(match + element)*, (element + action)]
// match will always have element, and either match or action
if (!UPDATE_MATCH.equals(buffer.currentName())) {
// we have reached an action...
if (topLevelKey == null) {
return ValueUpdate.createMap(key, readSingleUpdate(buffer, valueTypeForMapUpdate(currentLevel), buffer.currentName(), ignoreUndefinedFields));
} else {
return ValueUpdate.createMap(topLevelKey, readSingleUpdate(buffer, valueTypeForMapUpdate(currentLevel), buffer.currentName(), ignoreUndefinedFields));
}
} else {
// next level of matching
if (topLevelKey == null) {
return createMapUpdate(buffer, valueTypeForMapUpdate(currentLevel), key, key, ignoreUndefinedFields);
} else {
return createMapUpdate(buffer, valueTypeForMapUpdate(currentLevel), key, topLevelKey, ignoreUndefinedFields);
}
}
}
@SuppressWarnings("rawtypes")
public static ValueUpdate createMapUpdate(TokenBuffer buffer, Field field, boolean ignoreUndefinedFields) {
buffer.next();
MapValueUpdate m = (MapValueUpdate) MapReader.createMapUpdate(buffer, field.getDataType(), null, null, ignoreUndefinedFields);
buffer.next();
// must generate the field value in parallell with the actual
return m;
}
private static DataType valueTypeForMapUpdate(DataType parentType) {
if (parentType instanceof WeightedSetDataType) {
return DataType.INT;
} else if (parentType instanceof CollectionDataType) {
return ((CollectionDataType) parentType).getNestedType();
} else if (parentType instanceof MapDataType) {
return ((MapDataType) parentType).getValueType();
} else {
throw new UnsupportedOperationException("Unexpected parent type: " + parentType);
}
}
private static FieldValue keyTypeForMapUpdate(TokenBuffer.Token element, DataType expectedType) {
FieldValue v;
if (expectedType instanceof ArrayDataType) {
v = new IntegerFieldValue(Integer.valueOf(element.text));
} else if (expectedType instanceof WeightedSetDataType) {
v = ((WeightedSetDataType) expectedType).getNestedType().createFieldValue(element.text);
} else if (expectedType instanceof MapDataType) {
v = ((MapDataType) expectedType).getKeyType().createFieldValue(element.text);
} else {
throw new IllegalArgumentException("Container type " + expectedType + " not supported for match update.");
}
return v;
}
}
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