com.pervasive.datarush.schema

Class TypePattern

java.lang.Object

com.pervasive.datarush.schema.TypePattern

public class TypePattern
extends Object

Describes a pattern which identifies a text data type. Values which match the pattern can be assumed to be of the associated data type. TypePattern objects are used in conjunction with PatternBasedDiscovery to discover schemas for text files.

A number of patterns are pre-defined for common types.

Field Summary

Fields

Modifier and Type	Field and Description
static TypePattern	BOOLEAN_PATTERN A pattern declaring a mapping to TextTypes.TRUE_FALSE.
static TypePattern	DATE_PATTERN A pattern declaring a mapping to TextTypes.ISO_DATE.
static TypePattern	DOUBLE_PATTERN A pattern declaring a mapping to TextTypes.JAVA_DOUBLE.
static TypePattern	INT_PATTERN A pattern declaring a mapping to TextTypes.JAVA_INT.
static TypePattern	LONG_PATTERN A pattern declaring a mapping to TextTypes.JAVA_LONG.
static TypePattern	TIME_PATTERN A pattern declaring a mapping to TextTypes.ISO_TIMEOFDAY.
static TypePattern	TIMESTAMP_PATTERN A pattern declaring a mapping to TextTypes.ISO_TIMESTAMP.

Constructor Summary

Constructors

Constructor and Description
TypePattern(String pattern, TextDataType type) Declares the given pattern identifies values of the specified type.

Method Summary

Modifier and Type	Method and Description
String	getPattern() Gets the pattern used for the mapping.
TextDataType	getType() Gets the type implied by the mapping.
boolean	matches(String value) Indicates if the given value matches the pattern.

Methods inherited from class java.lang.Object

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

Field Detail

INT_PATTERN

public static final TypePattern INT_PATTERN

A pattern declaring a mapping to TextTypes.JAVA_INT. Matches values containing an optional sign and between 1 and 9 digits.

LONG_PATTERN

public static final TypePattern LONG_PATTERN

A pattern declaring a mapping to TextTypes.JAVA_LONG. Matches values containing an optional sign and between 1 and 18 digits.

DOUBLE_PATTERN

public static final TypePattern DOUBLE_PATTERN

A pattern declaring a mapping to TextTypes.JAVA_DOUBLE. Matches values containing an optional sign and any number of digits with a decimal point ('.') embedded. Values may also have an optional exponent suffix ('E-2', for example).

DATE_PATTERN

public static final TypePattern DATE_PATTERN

A pattern declaring a mapping to TextTypes.ISO_DATE. Matches values roughly conforming to the form of ISO-8601 dates.

• The year may be any number of digits.
• The month and day must be 1 or 2 digits.

TIME_PATTERN

public static final TypePattern TIME_PATTERN

A pattern declaring a mapping to TextTypes.ISO_TIMEOFDAY. Matches values roughly conforming to the form of ISO-8601 times without zone offset.

• The hour, minute, second must be 1 or 2 digits.
• A subsecond qualifier on the time may optionally be present.

TIMESTAMP_PATTERN

public static final TypePattern TIMESTAMP_PATTERN

A pattern declaring a mapping to TextTypes.ISO_TIMESTAMP. Matches values roughly conforming to the form of ISO-8601 timestamps.

• The year may be any number of digits.
• The month and day must be 1 or 2 digits.
• The date/time value is separated by either a 'T' or a space (' ').
• The hour, minute, second must be 1 or 2 digits.
• A subsecond qualifier on the time may optionally be present.
• A timezone identifier, either in the form 'Z' or explicit offset, may optionally be present.

BOOLEAN_PATTERN

public static final TypePattern BOOLEAN_PATTERN

A pattern declaring a mapping to TextTypes.TRUE_FALSE. Matches the values "true" and "false" case-insensitively.

Constructor Detail

TypePattern

public TypePattern(String pattern,
                   TextDataType type)

Declares the given pattern identifies values of the specified type. Patterns are specified as regular expressions which must match the entire value.

Parameters:

pattern - the regular expression to be matched

type - the external data type implied by the pattern

Method Detail

matches

public boolean matches(String value)

Indicates if the given value matches the pattern.

Parameters:

value - the value to test

Returns:

true if the value matches the pattern and should be considered to have the associated type false otherwise.

getPattern

public String getPattern()

Gets the pattern used for the mapping.

Returns:

the regular expression used to test for matches

getType

public TextDataType getType()

Gets the type implied by the mapping.

Returns:

the external data type matching values can be assumed to have