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package com.salesforce.phoenix.parse;
import java.sql.SQLException;
import java.util.List;
import com.salesforce.phoenix.compile.StatementContext;
import com.salesforce.phoenix.expression.Expression;
import com.salesforce.phoenix.expression.function.CeilDateExpression;
import com.salesforce.phoenix.expression.function.CeilDecimalExpression;
import com.salesforce.phoenix.expression.function.CeilFunction;
import com.salesforce.phoenix.expression.function.CeilTimestampExpression;
import com.salesforce.phoenix.schema.PDataType;
import com.salesforce.phoenix.schema.TypeMismatchException;
/**
* Parse node corresponding to {@link CeilFunction}.
* It also acts as a factory for creating the right kind of
* ceil expression according to the data type of the
* first child.
*
* @author samarth.jain
* @since 3.0.0
*/
public class CeilParseNode extends FunctionParseNode {
CeilParseNode(String name, List<ParseNode> children, BuiltInFunctionInfo info) {
super(name, children, info);
}
@Override
public Expression create(List<Expression> children, StatementContext context) throws SQLException {
return getCeilExpression(children);
}
public static Expression getCeilExpression(List<Expression> children) throws SQLException {
final Expression firstChild = children.get(0);
final PDataType firstChildDataType = firstChild.getDataType();
if(firstChildDataType.isCoercibleTo(PDataType.DATE)) {
return CeilDateExpression.create(children);
} else if (firstChildDataType == PDataType.TIMESTAMP || firstChildDataType == PDataType.UNSIGNED_TIMESTAMP) {
return CeilTimestampExpression.create(children);
} else if(firstChildDataType.isCoercibleTo(PDataType.DECIMAL)) {
return new CeilDecimalExpression(children);
} else {
throw TypeMismatchException.newException(firstChildDataType, "1");
}
}
/**
* When ceiling off decimals, user need not specify the scale. In such cases,
* we need to prevent the function from getting evaluated as null. This is really
* a hack. A better way would have been if {@link com.salesforce.phoenix.parse.FunctionParseNode.BuiltInFunctionInfo} provided a
* way of associating default values for each permissible data type.
* Something like: @ Argument(allowedTypes={PDataType.VARCHAR, PDataType.INTEGER}, defaultValues = {"null", "1"} isConstant=true)
* Till then, this will have to do.
*/
@Override
public boolean evalToNullIfParamIsNull(StatementContext context, int index) throws SQLException {
return index == 0;
}
}