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Adding inequality functions
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‎CHANGELOG.md

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### Added
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- `Fn3-8` static factory overloads to aid in coercing lambdas
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- Adding composition guarantees to `LensLike`
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- `CmpEqBy`, `CmpEq`, `GTBy`, `GT`, `LTBy`, `LT`, `GTEBy`, `GTE`, `LTEBy`, and `LTE` inequality checks
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## [3.0.3] - 2018-05-27
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### Added

‎src/main/java/com/jnape/palatable/lambda/functions/builtin/fn2/CmpEq.java

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package com.jnape.palatable.lambda.functions.builtin.fn2;
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import com.jnape.palatable.lambda.functions.builtin.fn3.CmpEqBy;
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import com.jnape.palatable.lambda.functions.specialized.BiPredicate;
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import com.jnape.palatable.lambda.functions.specialized.Predicate;
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import static com.jnape.palatable.lambda.functions.builtin.fn1.Id.id;
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import static com.jnape.palatable.lambda.functions.builtin.fn3.CmpEqBy.cmpEqBy;
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/**
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* Given two {@link Comparable} values of type <code>A</code>, return <code>true</code> if the first value is strictly
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* equal to the second value (according to {@link Comparable#compareTo(Object)}; otherwise, return false.
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*
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* @param <A> the value type
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* @see CmpEqBy
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* @see LT
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* @see GT
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*/
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public final class CmpEq<A extends Comparable<A>> implements BiPredicate<A, A> {
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private static final CmpEq INSTANCE = new CmpEq();
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private CmpEq() {
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}
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@Override
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public Boolean apply(A x, A y) {
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return cmpEqBy(id(), x, y);
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}
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@SuppressWarnings("unchecked")
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public static <A extends Comparable<A>> CmpEq<A> cmpEq() {
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return INSTANCE;
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}
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public static <A extends Comparable<A>> Predicate<A> cmpEq(A x) {
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return CmpEq.<A>cmpEq().apply(x);
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}
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public static <A extends Comparable<A>> Boolean cmpEq(A x, A y) {
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return cmpEq(x).apply(y);
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}
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}

‎src/main/java/com/jnape/palatable/lambda/functions/builtin/fn2/GT.java

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package com.jnape.palatable.lambda.functions.builtin.fn2;
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import com.jnape.palatable.lambda.functions.builtin.fn3.GTBy;
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import com.jnape.palatable.lambda.functions.specialized.BiPredicate;
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import com.jnape.palatable.lambda.functions.specialized.Predicate;
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import static com.jnape.palatable.lambda.functions.builtin.fn1.Id.id;
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import static com.jnape.palatable.lambda.functions.builtin.fn3.GTBy.gtBy;
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/**
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* Given two {@link Comparable} values of type <code>A</code>, return <code>true</code> if the first value is strictly
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* greater than the second value; otherwise, return false.
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*
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* @param <A> the value type
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* @see GTBy
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* @see LT
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*/
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public final class GT<A extends Comparable<A>> implements BiPredicate<A, A> {
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private static final GT INSTANCE = new GT();
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private GT() {
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}
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@Override
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public Boolean apply(A x, A y) {
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return gtBy(id(), x, y);
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}
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@SuppressWarnings("unchecked")
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public static <A extends Comparable<A>> GT<A> gt() {
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return INSTANCE;
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}
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public static <A extends Comparable<A>> Predicate<A> gt(A x) {
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return GT.<A>gt().apply(x);
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}
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public static <A extends Comparable<A>> Boolean gt(A x, A y) {
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return gt(x).apply(y);
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}
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}

‎src/main/java/com/jnape/palatable/lambda/functions/builtin/fn2/GTE.java

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package com.jnape.palatable.lambda.functions.builtin.fn2;
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import com.jnape.palatable.lambda.functions.builtin.fn3.GTEBy;
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import com.jnape.palatable.lambda.functions.specialized.BiPredicate;
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import com.jnape.palatable.lambda.functions.specialized.Predicate;
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import static com.jnape.palatable.lambda.functions.builtin.fn1.Id.id;
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import static com.jnape.palatable.lambda.functions.builtin.fn3.GTEBy.gteBy;
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/**
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* Given two {@link Comparable} values of type <code>A</code>, return <code>true</code> if the first value is greater
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* than or equal to the second value according to {@link Comparable#compareTo(Object)}; otherwise, return false.
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*
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* @param <A> the value type
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* @see GTEBy
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* @see LTE
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*/
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public final class GTE<A extends Comparable<A>> implements BiPredicate<A, A> {
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private static final GTE INSTANCE = new GTE();
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private GTE() {
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}
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@Override
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public Boolean apply(A x, A y) {
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return gteBy(id(), x, y);
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}
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@SuppressWarnings("unchecked")
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public static <A extends Comparable<A>> GTE<A> gte() {
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return INSTANCE;
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}
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public static <A extends Comparable<A>> Predicate<A> gte(A x) {
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return GTE.<A>gte().apply(x);
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}
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public static <A extends Comparable<A>> Boolean gte(A x, A y) {
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return gte(x).apply(y);
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}
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}

‎src/main/java/com/jnape/palatable/lambda/functions/builtin/fn2/LT.java

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package com.jnape.palatable.lambda.functions.builtin.fn2;
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import com.jnape.palatable.lambda.functions.builtin.fn3.LTBy;
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import com.jnape.palatable.lambda.functions.specialized.BiPredicate;
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import com.jnape.palatable.lambda.functions.specialized.Predicate;
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import static com.jnape.palatable.lambda.functions.builtin.fn1.Id.id;
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import static com.jnape.palatable.lambda.functions.builtin.fn3.LTBy.ltBy;
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/**
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* Given two {@link Comparable} values of type <code>A</code>, return <code>true</code> if the first value is strictly
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* less than the second value; otherwise, return false.
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*
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* @param <A> the value type
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* @see LTBy
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* @see GT
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*/
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public final class LT<A extends Comparable<A>> implements BiPredicate<A, A> {
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private static final LT INSTANCE = new LT();
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private LT() {
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}
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@Override
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public Boolean apply(A x, A y) {
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return ltBy(id(), x, y);
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}
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@SuppressWarnings("unchecked")
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public static <A extends Comparable<A>> LT<A> lt() {
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return INSTANCE;
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}
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public static <A extends Comparable<A>> Predicate<A> lt(A x) {
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return LT.<A>lt().apply(x);
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}
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public static <A extends Comparable<A>> Boolean lt(A x, A y) {
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return lt(x).apply(y);
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}
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}

‎src/main/java/com/jnape/palatable/lambda/functions/builtin/fn2/LTE.java

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package com.jnape.palatable.lambda.functions.builtin.fn2;
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import com.jnape.palatable.lambda.functions.builtin.fn3.LTEBy;
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import com.jnape.palatable.lambda.functions.specialized.BiPredicate;
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import com.jnape.palatable.lambda.functions.specialized.Predicate;
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import static com.jnape.palatable.lambda.functions.builtin.fn1.Id.id;
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import static com.jnape.palatable.lambda.functions.builtin.fn3.LTEBy.lteBy;
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/**
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* Given two {@link Comparable} values of type <code>A</code>, return <code>true</code> if the first value is less than
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* or equal to the second value according to {@link Comparable#compareTo(Object);} otherwise, return false.
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*
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* @param <A> the value typ
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* @see LTEBy
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* @see GTE
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*/
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public final class LTE<A extends Comparable<A>> implements BiPredicate<A, A> {
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private static final LTE INSTANCE = new LTE();
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private LTE() {
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}
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@Override
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public Boolean apply(A x, A y) {
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return lteBy(id(), x, y);
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}
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@SuppressWarnings("unchecked")
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public static <A extends Comparable<A>> LTE<A> lte() {
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return INSTANCE;
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}
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public static <A extends Comparable<A>> Predicate<A> lte(A x) {
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return LTE.<A>lte().apply(x);
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}
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public static <A extends Comparable<A>> Boolean lte(A x, A y) {
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return lte(x).apply(y);
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}
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}

‎src/main/java/com/jnape/palatable/lambda/functions/builtin/fn3/CmpEqBy.java

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package com.jnape.palatable.lambda.functions.builtin.fn3;
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import com.jnape.palatable.lambda.functions.Fn3;
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import com.jnape.palatable.lambda.functions.builtin.fn2.CmpEq;
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import com.jnape.palatable.lambda.functions.specialized.BiPredicate;
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import com.jnape.palatable.lambda.functions.specialized.Predicate;
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import java.util.function.Function;
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/**
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* Given a mapping function from some type <code>A</code> to some {@link Comparable} type <code>B</code> and two values
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* of type <code>A</code>, return <code>true</code> if the first value is strictly equal to the second value (according
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* to {@link Comparable#compareTo(Object)} in terms of their mapped <code>B</code> results; otherwise, return false.
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*
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* @param <A> the value type
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* @param <B> the mapped comparison type
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* @see CmpEq
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* @see LTBy
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* @see GTBy
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*/
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public final class CmpEqBy<A, B extends Comparable<B>> implements Fn3<Function<? super A, ? extends B>, A, A, Boolean> {
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private static final CmpEqBy INSTANCE = new CmpEqBy();
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private CmpEqBy() {
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}
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@Override
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public Boolean apply(Function<? super A, ? extends B> compareFn, A x, A y) {
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return compareFn.apply(x).compareTo(compareFn.apply(y)) == 0;
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}
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@Override
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public BiPredicate<A, A> apply(Function<? super A, ? extends B> compareFn) {
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return Fn3.super.apply(compareFn)::apply;
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}
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@Override
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public Predicate<A> apply(Function<? super A, ? extends B> compareFn, A x) {
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return Fn3.super.apply(compareFn, x)::apply;
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}
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@SuppressWarnings("unchecked")
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public static <A, B extends Comparable<B>> CmpEqBy<A, B> cmpEqBy() {
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return INSTANCE;
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}
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public static <A, B extends Comparable<B>> BiPredicate<A, A> cmpEqBy(Function<? super A, ? extends B> compareFn) {
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return CmpEqBy.<A, B>cmpEqBy().apply(compareFn);
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}
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public static <A, B extends Comparable<B>> Predicate<A> cmpEqBy(Function<? super A, ? extends B> compareFn, A x) {
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return CmpEqBy.<A, B>cmpEqBy(compareFn).apply(x);
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}
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public static <A, B extends Comparable<B>> Boolean cmpEqBy(Function<? super A, ? extends B> compareFn, A x, A y) {
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return cmpEqBy(compareFn, x).apply(y);
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}
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}

‎src/main/java/com/jnape/palatable/lambda/functions/builtin/fn3/GTBy.java

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package com.jnape.palatable.lambda.functions.builtin.fn3;
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import com.jnape.palatable.lambda.functions.Fn3;
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import com.jnape.palatable.lambda.functions.builtin.fn2.GT;
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import com.jnape.palatable.lambda.functions.specialized.BiPredicate;
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import com.jnape.palatable.lambda.functions.specialized.Predicate;
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import java.util.function.Function;
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/**
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* Given a mapping function from some type <code>A</code> to some {@link Comparable} type <code>B</code> and two values
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* of type <code>A</code>, return <code>true</code> if the first value is strictly greater than the second value in
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* terms of their mapped <code>B</code> results; otherwise, return false.
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*
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* @param <A> the value type
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* @param <B> the mapped comparison type
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* @see GT
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* @see LTBy
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*/
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public final class GTBy<A, B extends Comparable<B>> implements Fn3<Function<? super A, ? extends B>, A, A, Boolean> {
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private static final GTBy INSTANCE = new GTBy();
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private GTBy() {
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}
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@Override
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public Boolean apply(Function<? super A, ? extends B> compareFn, A x, A y) {
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return compareFn.apply(x).compareTo(compareFn.apply(y)) > 0;
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}
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@Override
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public BiPredicate<A, A> apply(Function<? super A, ? extends B> compareFn) {
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return Fn3.super.apply(compareFn)::apply;
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}
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@Override
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public Predicate<A> apply(Function<? super A, ? extends B> compareFn, A x) {
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return Fn3.super.apply(compareFn, x)::apply;
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}
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@SuppressWarnings("unchecked")
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public static <A, B extends Comparable<B>> GTBy<A, B> gtBy() {
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return INSTANCE;
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}
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public static <A, B extends Comparable<B>> BiPredicate<A, A> gtBy(Function<? super A, ? extends B> fn) {
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return GTBy.<A, B>gtBy().apply(fn);
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}
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public static <A, B extends Comparable<B>> Predicate<A> gtBy(Function<? super A, ? extends B> fn, A x) {
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return GTBy.<A, B>gtBy(fn).apply(x);
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}
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public static <A, B extends Comparable<B>> Boolean gtBy(Function<? super A, ? extends B> fn, A x, A y) {
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return gtBy(fn, x).apply(y);
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}
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}

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