Package org.opencms.util

Class CmsPair<A,B>

java.lang.Object

org.opencms.util.CmsPair<A,B>

Type Parameters:

A - type of the first component of the pair

B - type of the second component of the pair

All Implemented Interfaces:

Serializable

public class CmsPair<A,B>
extends Object
implements Serializable

Generic pair class.

Since:

8.0.0

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
CmsPair()	Serialization constructor.
CmsPair(A a, B b)	Creates a new pair containing two objects.

Method Summary

Modifier and Type	Method	Description
static <A, B> CmsPair<A,B>	create(A a, B b)	Helper method for constructing a pair which avoids having to explicitly write the generic type parameters.
boolean	equals(Object o)
A	getFirst()	Returns the first component of the pair.
static <A extends Comparable<A>, B extends Comparable<B>> Comparator<CmsPair<A,B>>	getLexicalComparator()	Utility method which creates a new comparator for lexically ordering pairs.
B	getSecond()	Returns the second component of the pair.
int	hashCode()
static Map<String,String>	pairsToMap(List<CmsPair<String,String>> pairs)	Helper method for converting a list of string pairs to a string map.

Methods inherited from class java.lang.Object

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

Constructor Details

CmsPair

public CmsPair()

Serialization constructor.

CmsPair

public CmsPair(A a,
 B b)

Creates a new pair containing two objects.

Parameters:

a - the first component

b - the second component

Method Details

create

public static <A,
B> CmsPair<A,B> create(A a,
 B b)

Helper method for constructing a pair which avoids having to explicitly write the generic type parameters.

Type Parameters:

A - the type for the first component

B - the type for the second component

Parameters:

a - the first component

b - the second component

Returns:

the pair (a, b)

getLexicalComparator

public static <A extends Comparable<A>,
B extends Comparable<B>>
Comparator<CmsPair<A,B>> getLexicalComparator()

Utility method which creates a new comparator for lexically ordering pairs.

Lexical ordering means that a pair is considered "less" than another if either its first component is less than that of the other one, or their first components are equal and the second component of the first pair is less than that of the other one.

Type Parameters:

A - the type parameter for the first pair component

B - the type parameter for the second pair component

Returns:

a new comparator for lexically ordering pairs

pairsToMap

public static Map<String,String> pairsToMap(List<CmsPair<String,String>> pairs)

Helper method for converting a list of string pairs to a string map.

The first component of each pair is used as a map key, the second component as the value for the key.

Parameters:

pairs - the list of pairs

Returns:

a string map

equals

public boolean equals(Object o)

Overrides:

equals in class Object

See Also:

• Object.equals(java.lang.Object)

getFirst

public A getFirst()

Returns the first component of the pair.

Returns:

the first component of the pair

getSecond

public B getSecond()

Returns the second component of the pair.

Returns:

the second component of the pair

hashCode

public int hashCode()

Overrides:

hashCode in class Object

See Also:

• Object.hashCode()