com.hazelcast.jet.sql.impl.expression.json.JsonObjectFunction Maven / Gradle / Ivy
/*
* Copyright 2021 Hazelcast Inc.
*
* Licensed under the Hazelcast Community License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://hazelcast.com/hazelcast-community-license
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.jet.sql.impl.expression.json;
import com.hazelcast.core.HazelcastJsonValue;
import com.hazelcast.jet.sql.impl.JetSqlSerializerHook;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.IdentifiedDataSerializable;
import com.hazelcast.sql.impl.expression.Expression;
import com.hazelcast.sql.impl.expression.ExpressionEvalContext;
import com.hazelcast.sql.impl.expression.VariExpression;
import com.hazelcast.sql.impl.row.Row;
import com.hazelcast.sql.impl.type.QueryDataType;
import com.hazelcast.org.apache.calcite.sql.SqlJsonConstructorNullClause;
import java.io.IOException;
public class JsonObjectFunction extends VariExpression implements IdentifiedDataSerializable {
private SqlJsonConstructorNullClause nullClause;
public JsonObjectFunction() { }
private JsonObjectFunction(final Expression>[] fields, final SqlJsonConstructorNullClause nullClause) {
super(fields);
this.nullClause = nullClause;
}
public static JsonObjectFunction create(
final Expression>[] fields,
final SqlJsonConstructorNullClause nullClause
) {
return new JsonObjectFunction(fields, nullClause);
}
@Override
public int getFactoryId() {
return JetSqlSerializerHook.F_ID;
}
@Override
public int getClassId() {
return JetSqlSerializerHook.JSON_OBJECT;
}
@Override
public HazelcastJsonValue eval(final Row row, final ExpressionEvalContext context) {
StringBuilder sb = new StringBuilder();
sb.append('{');
boolean isFirst = true;
for (int i = 0; i < operands.length; i += 2) {
final Object key = operands[i].eval(row, context);
final Object value = operands[i + 1].eval(row, context);
if (value == null && !keepNulls()) {
continue;
}
if (isFirst) {
isFirst = false;
} else {
sb.append(',');
}
assert key instanceof String;
sb.append(JsonCreationUtil.serializeString((String) key));
sb.append(':');
sb.append(JsonCreationUtil.serializeValue(value));
}
sb.append('}');
return new HazelcastJsonValue(sb.toString());
}
private boolean keepNulls() {
return nullClause.equals(SqlJsonConstructorNullClause.NULL_ON_NULL);
}
@Override
public QueryDataType getType() {
return QueryDataType.JSON;
}
@Override
public void writeData(final ObjectDataOutput out) throws IOException {
super.writeData(out);
out.writeString(nullClause.name());
}
@Override
public void readData(final ObjectDataInput in) throws IOException {
super.readData(in);
this.nullClause = SqlJsonConstructorNullClause.valueOf(in.readString());
}
}
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