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package com.salesforce.phoenix.expression.function;
import java.sql.SQLException;
import java.util.List;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import com.salesforce.phoenix.expression.Expression;
import com.salesforce.phoenix.parse.FunctionParseNode.Argument;
import com.salesforce.phoenix.parse.FunctionParseNode.BuiltInFunction;
import com.salesforce.phoenix.schema.PDataType;
import com.salesforce.phoenix.schema.PTableType;
import com.salesforce.phoenix.schema.tuple.Tuple;
/**
*
* Function used to get the SQL table type name from the serialized table type.
* Usage:
* SqlTableType('v') will return 'VIEW' based on
* {@link java.sql.DatabaseMetaData#getTableTypes()}
*
* @author jtaylor
* @since 2.2
*/
@BuiltInFunction(name=SQLTableTypeFunction.NAME, args= {
@Argument(allowedTypes=PDataType.CHAR)} )
public class SQLTableTypeFunction extends ScalarFunction {
public static final String NAME = "SQLTableType";
public SQLTableTypeFunction() {
}
public SQLTableTypeFunction(List<Expression> children) throws SQLException {
super(children);
}
@Override
public boolean evaluate(Tuple tuple, ImmutableBytesWritable ptr) {
Expression child = children.get(0);
if (!child.evaluate(tuple, ptr)) {
return false;
}
if (ptr.getLength() == 0) {
return true;
}
PTableType tableType = PTableType.fromSerializedValue(ptr.get()[ptr.getOffset()]);
ptr.set(tableType.getValue().getBytes());
return true;
}
@Override
public PDataType getDataType() {
return PDataType.VARCHAR;
}
@Override
public String getName() {
return NAME;
}
}