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/*
 * Copyright 2024 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.sql.impl.expression;

import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.sql.impl.row.Row;
import com.hazelcast.sql.impl.type.QueryDataType;

/**
 * Surrogate expression that is used to pass literal symbols during conversion.
 * 

* For example, for the expression {@code TRIM(LEADING FROM field)} the first operand is Calcite's symbol "LEADING". *

* It is not meant to be serialized or evaluated. */ public final class SymbolExpression implements Expression { private Object symbol; public SymbolExpression() { // No-op } private SymbolExpression(Object symbol) { this.symbol = symbol; } public static SymbolExpression create(Object symbol) { return new SymbolExpression(symbol); } @SuppressWarnings("unchecked") public T getSymbol() { return (T) symbol; } @Override public Object eval(Row row, ExpressionEvalContext context) { throw unsupported(); } @Override public QueryDataType getType() { throw unsupported(); } @Override public int getFactoryId() { throw unsupported(); } @Override public int getClassId() { throw unsupported(); } @Override public void writeData(ObjectDataOutput out) { throw unsupported(); } @Override public void readData(ObjectDataInput in) { throw unsupported(); } private static UnsupportedOperationException unsupported() { throw new UnsupportedOperationException("Should not be called"); } @Override public boolean isCooperative() { return true; } }