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CDS QL Execution Engine

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/************************************************************************
 * © 2021-2024 SAP SE or an SAP affiliate company. All rights reserved. *
 ************************************************************************/
package com.sap.cds.jdbc.hana;

import static com.sap.cds.impl.util.RealVectorUtils.toByteArray;

import java.io.InputStream;
import java.io.Reader;
import java.sql.Blob;
import java.sql.NClob;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.TimeZone;

import com.sap.cds.CdsDataStoreException;
import com.sap.cds.CdsVector;
import com.sap.cds.impl.builder.model.RealVector;
import com.sap.cds.jdbc.generic.GenericBinder;

// package private
class HanaBinder extends GenericBinder {

	// package private
	HanaBinder(TimeZone timeZone) {
		// no public construction
		super(7, timeZone);
	}

	@Override
	protected Reader getLargeString(ResultSet result, int i) throws SQLException {
		NClob nClob = result.getNClob(i);
		return null == nClob ? null : nClob.getCharacterStream();
	}

	@Override
	protected InputStream getLargeBinary(ResultSet result, int i) throws SQLException {
		Blob blob = result.getBlob(i);
		return null == blob ? null : blob.getBinaryStream();
	}

	@Override
	protected void setRealVector(PreparedStatement pstmt, int i, Object vector) throws SQLException {
		if (vector instanceof RealVector v) {
			vector = v.vector();
		}
		if (vector == null) {
			pstmt.setNull(i, Types.BINARY);
		} else if (vector instanceof byte[] b) {
			pstmt.setBytes(i, b);
		} else if (vector instanceof float[] f) {
			pstmt.setBytes(i, toByteArray(f));
		} else if (vector instanceof String s) {
			pstmt.setBytes(i, toByteArray(s));
		} else {
			throw new CdsDataStoreException(vector.getClass().getName() + " is not supported for type cds.Vector");
		}
	}

	@Override
	protected CdsVector getRealVector(ResultSet result, int i) throws SQLException {
		byte[] vector = result.getBytes(i);

		return RealVector.hanaRealVector(vector);
	}

}