net.objectlab.kit.util.predicate

Class PrintablePredicate<T>

java.lang.Object

net.objectlab.kit.util.predicate.PrintablePredicate<T>

Type Parameters:

T - Can be used for any class.

All Implemented Interfaces:

Predicate<T>

public class PrintablePredicate<T>
extends Object
implements Predicate<T>

Class to represent a Predicate that can be displayed for human consumption. Often, if you model some predicates for a data set, it would be great to print a predicate so that a user could understand it. You then get just a java useful string like "x.y.x.Predicate@0x1231abc". Wouldn't it be better to get:

 AssetClass in (Equity, Bond) and State=Active
 

This achieved easily, assume Asset has assetClass and State, you can write 2 flexible predicates:

 public static Predicate<Asset> hasAssetClass(String... assetClass) {
  return new PrintablePredicate<>("AssetClass",  t -> StringUtil.equalsAnyIgnoreCase(t.getAssetClass(), assetClass), assetClass);
 }
 public static Predicate<Asset> hasState(String... state) {
  return new PrintablePredicate><("State",  t -> StringUtil.equalsAnyIgnoreCase(t.getState(), state), state);
 }
 // now Combine them:
 Predicate<Asset> predicate = hasAssetClass("Equity","Bond").and(hasState("Active"));
 System.out.println(predicate); // AssetClass in (Equity, Bond) and State=Active
 
 

Author:

Benoit Xhenseval

Constructor Summary

Constructors

Constructor and Description
PrintablePredicate(PrintablePredicateOperand operand, Predicate<? super T> left, Predicate<? super T> right)
PrintablePredicate(PrintablePredicateOperand operand, Predicate<T> predicate, Object... values)
PrintablePredicate(String name, Predicate<T> predicate, Object... values)

Method Summary

Modifier and Type	Method and Description
PrintablePredicate<T>	and(Predicate<? super T> other)
PrintablePredicate<T>	negate()
PrintablePredicate<T>	or(Predicate<? super T> other)
boolean	test(T t)
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.function.Predicate

isEqual

Constructor Detail

PrintablePredicate

public PrintablePredicate(String name,
                          Predicate<T> predicate,
                          Object... values)

PrintablePredicate

public PrintablePredicate(PrintablePredicateOperand operand,
                          Predicate<T> predicate,
                          Object... values)

PrintablePredicate

public PrintablePredicate(PrintablePredicateOperand operand,
                          Predicate<? super T> left,
                          Predicate<? super T> right)

Method Detail

test

public boolean test(T t)

Specified by:

test in interface Predicate<T>

toString

public String toString()

Overrides:

toString in class Object

or

public PrintablePredicate<T> or(Predicate<? super T> other)

Specified by:

or in interface Predicate<T>

and

public PrintablePredicate<T> and(Predicate<? super T> other)

Specified by:

and in interface Predicate<T>

negate

public PrintablePredicate<T> negate()

Specified by:

negate in interface Predicate<T>