de.fuberlin.wiwiss.d2rq.values

Class Pattern

java.lang.Object

de.fuberlin.wiwiss.d2rq.values.Pattern

All Implemented Interfaces:

ValueMaker

public class Pattern
extends Object
implements ValueMaker

A pattern that combines one or more database columns into a String. Often used as an UriPattern for generating URIs from a column's primary key.

Author:

Richard Cyganiak (richard@cyganiak.de)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Pattern.EncodeFunction

Field Summary

Fields

Modifier and Type	Field and Description
static String	DELIMITER

Fields inherited from interface de.fuberlin.wiwiss.d2rq.values.ValueMaker

NULL

Constructor Summary

Constructors

Constructor and Description
Pattern(String pattern) Constructs a new Pattern instance from a pattern syntax string

Method Summary

Methods

Modifier and Type	Method and Description
List<Attribute>	attributes()
void	describeSelf(NodeSetFilter c)
boolean	equals(Object otherObject)
String	firstLiteralPart()
int	hashCode()
boolean	isEquivalentTo(Pattern p)
String	lastLiteralPart()
boolean	literalPartsMatchRegex(String regex)
String	makeValue(ResultRow row) Constructs a String from the pattern using the given database row.
boolean	matches(String value)
List<OrderSpec>	orderSpecs(boolean ascending)
Iterator<Object>	partsIterator()
Set<ProjectionSpec>	projectionSpecs() Returns a set of all ProjectionSpecs containing data necessary for this ValueSource.
ValueMaker	renameAttributes(ColumnRenamer renames)
Expression	toExpression()
String	toString()
boolean	usesColumnFunctions()
Expression	valueExpression(String value) A SQL expression that selects only rows where this value maker produces the specified value.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

DELIMITER

public static final String DELIMITER

See Also:

Constant Field Values

Constructor Detail

Pattern

public Pattern(String pattern)

Constructs a new Pattern instance from a pattern syntax string

Parameters:

pattern - a pattern syntax string

Throws:

D2RQException - on malformed pattern

Method Detail

firstLiteralPart

public String firstLiteralPart()

lastLiteralPart

public String lastLiteralPart()

literalPartsMatchRegex

public boolean literalPartsMatchRegex(String regex)

attributes

public List<Attribute> attributes()

describeSelf

public void describeSelf(NodeSetFilter c)

Specified by:

describeSelf in interface ValueMaker

matches

public boolean matches(String value)

valueExpression

public Expression valueExpression(String value)

Description copied from interface: ValueMaker

A SQL expression that selects only rows where this value maker produces the specified value. Expression.FALSE if this value maker is incapable of producing the value.

Specified by:

valueExpression in interface ValueMaker

Parameters:

value - A value

Returns:

An expression that selects rows that produce this value

projectionSpecs

public Set<ProjectionSpec> projectionSpecs()

Description copied from interface: ValueMaker

Returns a set of all ProjectionSpecs containing data necessary for this ValueSource.

Specified by:

projectionSpecs in interface ValueMaker

Returns:

a set of ProjectionSpecs

makeValue

public String makeValue(ResultRow row)

Constructs a String from the pattern using the given database row.

Specified by:

makeValue in interface ValueMaker

Parameters:

row - a database row

Returns:

the pattern's value for the given row

orderSpecs

public List<OrderSpec> orderSpecs(boolean ascending)

Specified by:

orderSpecs in interface ValueMaker

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object otherObject)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

isEquivalentTo

public boolean isEquivalentTo(Pattern p)

Returns:

true if the pattern is identical or differs only in the column names

renameAttributes

public ValueMaker renameAttributes(ColumnRenamer renames)

Specified by:

renameAttributes in interface ValueMaker

partsIterator

public Iterator<Object> partsIterator()

toExpression

public Expression toExpression()

usesColumnFunctions

public boolean usesColumnFunctions()

Returns:

TRUE if this pattern uses any column function (encode, urlify, etc.)