com.sap.cds.jdbc.hana.json.HanaDocStoreScalarValueResolver Maven / Gradle / Ivy

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/*******************************************************************
 * © 2024 SAP SE or an SAP affiliate company. All rights reserved. *
 *******************************************************************/
package com.sap.cds.jdbc.hana.json;

import com.sap.cds.jdbc.generic.GenericScalarValueResolver;
import com.sap.cds.jdbc.spi.ScalarValueResolver;
import com.sap.cds.ql.cqn.CqnBooleanLiteral;
import com.sap.cds.ql.cqn.CqnLiteral;
import com.sap.cds.ql.cqn.CqnParameter;
import com.sap.cds.reflect.CdsBaseType;

public class HanaDocStoreScalarValueResolver extends GenericScalarValueResolver {

	private static final String JSON_TRUE = "TO_JSON_BOOLEAN(TRUE)";
	private static final String JSON_FALSE = "TO_JSON_BOOLEAN(FALSE)";

	public static final ScalarValueResolver INSTANCE = new HanaDocStoreScalarValueResolver();

	private HanaDocStoreScalarValueResolver() {
		// empty
	}

	@Override
	public String literal(CqnBooleanLiteral bool) {
		return Boolean.TRUE.equals(bool.value()) ? JSON_TRUE : JSON_FALSE;
	}

	@Override
	public String literal(CqnLiteral val) {
		return val.type().map(cdsType -> cast(toDocStoreType(cdsType))).orElse("?");
	}

	@Override
	public String parameter(CqnParameter param) {
		return param.type().map(cdsType -> cast(toDocStoreType(cdsType))).orElse("?");
	}

	@Override
	public String parameter(CdsBaseType baseType) {
		return cast(toDocStoreType(baseType));
	}

	private static String cast(String docStoreType) {
		return String.format("CAST(? AS %s)", docStoreType);
	}

	private static String toDocStoreType(String cdsType) {
		return toDocStoreType(CdsBaseType.cdsType(cdsType));
	}

	private static String toDocStoreType(CdsBaseType baseType) {
		return switch (baseType) {
			case INTEGER, INTEGER64 -> "BIGINT";
			case DECIMAL, DOUBLE -> "DOUBLE";
			case BOOLEAN -> "BOOLEAN";
			default -> "NVARCHAR";
		};
	}

}