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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you under the Apache License, Version 2.0
* (the "License"); you may not use this file except in com.hazelcast.com.liance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.org.licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.org.apache.calcite.sql.fun;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeFactory;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeField;
import com.hazelcast.org.apache.calcite.sql.SqlCall;
import com.hazelcast.org.apache.calcite.sql.SqlCallBinding;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.SqlNode;
import com.hazelcast.org.apache.calcite.sql.SqlOperandCountRange;
import com.hazelcast.org.apache.calcite.sql.SqlOperatorBinding;
import com.hazelcast.org.apache.calcite.sql.SqlSpecialOperator;
import com.hazelcast.org.apache.calcite.sql.SqlWriter;
import com.hazelcast.org.apache.calcite.sql.parser.SqlParserPos;
import com.hazelcast.org.apache.calcite.sql.type.OperandTypes;
import com.hazelcast.org.apache.calcite.sql.type.SqlOperandCountRanges;
import com.hazelcast.org.apache.calcite.sql.type.SqlSingleOperandTypeChecker;
import com.hazelcast.org.apache.calcite.sql.type.SqlTypeFamily;
import com.hazelcast.org.apache.calcite.sql.type.SqlTypeName;
import java.util.Arrays;
/**
* The item operator {@code [ ... ]}, used to access a given element of an
* array or map. For example, {@code myArray[3]} or {@code "myMap['foo']"}.
*/
class SqlItemOperator extends SqlSpecialOperator {
private static final SqlSingleOperandTypeChecker ARRAY_OR_MAP =
OperandTypes.or(
OperandTypes.family(SqlTypeFamily.ARRAY),
OperandTypes.family(SqlTypeFamily.MAP),
OperandTypes.family(SqlTypeFamily.ANY));
SqlItemOperator() {
super("ITEM", SqlKind.ITEM, 100, true, null, null, null);
}
@Override public ReduceResult reduceExpr(int ordinal,
TokenSequence list) {
SqlNode left = list.node(ordinal - 1);
SqlNode right = list.node(ordinal + 1);
return new ReduceResult(ordinal - 1,
ordinal + 2,
createCall(
SqlParserPos.sum(
Arrays.asList(left.getParserPosition(),
right.getParserPosition(),
list.pos(ordinal))),
left,
right));
}
@Override public void unparse(
SqlWriter writer, SqlCall call, int leftPrec, int rightPrec) {
call.operand(0).unparse(writer, leftPrec, 0);
final SqlWriter.Frame frame = writer.startList("[", "]");
call.operand(1).unparse(writer, 0, 0);
writer.endList(frame);
}
@Override public SqlOperandCountRange getOperandCountRange() {
return SqlOperandCountRanges.of(2);
}
@Override public boolean checkOperandTypes(
SqlCallBinding callBinding,
boolean throwOnFailure) {
final SqlNode left = callBinding.operand(0);
final SqlNode right = callBinding.operand(1);
if (!ARRAY_OR_MAP.checkSingleOperandType(callBinding, left, 0,
throwOnFailure)) {
return false;
}
final SqlSingleOperandTypeChecker checker = getChecker(callBinding);
return checker.checkSingleOperandType(callBinding, right, 0,
throwOnFailure);
}
private SqlSingleOperandTypeChecker getChecker(SqlCallBinding callBinding) {
final RelDataType operandType = callBinding.getOperandType(0);
switch (operandType.getSqlTypeName()) {
case ARRAY:
return OperandTypes.family(SqlTypeFamily.INTEGER);
case MAP:
return OperandTypes.family(
operandType.getKeyType().getSqlTypeName().getFamily());
case ROW:
return OperandTypes.CHARACTER;
case ANY:
case DYNAMIC_STAR:
return OperandTypes.or(
OperandTypes.family(SqlTypeFamily.INTEGER),
OperandTypes.family(SqlTypeFamily.CHARACTER));
default:
throw callBinding.newValidationSignatureError();
}
}
@Override public String getAllowedSignatures(String name) {
return "[]\n"
+ "