com.espertech.esper.view
Class PropertyCheckHelper

java.lang.Object
  com.espertech.esper.view.PropertyCheckHelper

public final class PropertyCheckHelper
extends java.lang.Object

Utility class for checking in a schema if fields exist and/or have an expected type.

Constructor Summary

PropertyCheckHelper()

Method Summary

static java.lang.String	checkLong(EventType type, java.lang.String longFieldName) Check if the field identified by the field name is of type long according to the schema.
static java.lang.String	checkNumeric(EventType type, java.lang.String numericFieldName) Check if the field identified by the field name is a valid numeric field according to the schema.
static java.lang.String	checkNumeric(EventType type, java.lang.String numericFieldNameX, java.lang.String numericFieldNameY) Check if the fields identified by their field names are valid numeric field according to the schema.
static java.lang.String	exists(EventType type, java.lang.String fieldName) Check if the field identified by the field name exists according to the schema.
static java.lang.String	exists(EventType type, java.lang.String fieldNameOne, java.lang.String fieldNameTwo) Check if the fields identified by the field names both exists according to the schema.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PropertyCheckHelper

public PropertyCheckHelper()

Method Detail

exists

public static java.lang.String exists(EventType type,
                                      java.lang.String fieldName)

Check if the field identified by the field name exists according to the schema.

Parameters:

type - contains metadata about fields

fieldName - is the field's field name to test

Returns:

a String error message if the field doesn't exist, or null to indicate success

exists

public static java.lang.String exists(EventType type,
                                      java.lang.String fieldNameOne,
                                      java.lang.String fieldNameTwo)

Check if the fields identified by the field names both exists according to the schema.

Parameters:

type - contains metadata about fields

fieldNameOne - is the first field's field name to test

fieldNameTwo - is the first field's field name to test

Returns:

a String error message if either of the fields doesn't exist, or null to indicate success

checkNumeric

public static java.lang.String checkNumeric(EventType type,
                                            java.lang.String numericFieldName)

Check if the field identified by the field name is a valid numeric field according to the schema.

Parameters:

type - contains metadata about fields

numericFieldName - is the field's field name to test

Returns:

a String error message if the field doesn't exist or is not numeric, or null to indicate success

checkNumeric

public static java.lang.String checkNumeric(EventType type,
                                            java.lang.String numericFieldNameX,
                                            java.lang.String numericFieldNameY)

Check if the fields identified by their field names are valid numeric field according to the schema.

Parameters:

type - contains metadata about fields

numericFieldNameX - is the first field's field name to test

numericFieldNameY - is the second field's field name to test

Returns:

a String error message if the field doesn't exist or is not numeric, or null to indicate success

checkLong

public static java.lang.String checkLong(EventType type,
                                         java.lang.String longFieldName)

Check if the field identified by the field name is of type long according to the schema.

Parameters:

type - contains metadata about fields

longFieldName - is the field's field name to test

Returns:

a String error message if the field doesn't exist or is not a long, or null to indicate success