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Value: add initial implementation

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Paul Campbell 2017-04-23 16:53:30 +01:00
parent 22c23e7e4a
commit 598f69a65b
2 changed files with 284 additions and 0 deletions
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56
src/main/java/net/kemitix/conditional/Value.java Normal file
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package net.kemitix.conditional;
import java.util.function.Supplier;
/**
* @author Paul Campbell (pcampbell@kemitix.net).
*/
public class Value<T> {
private boolean clause;
private Supplier<T> trueSupplier;
private Value(final boolean clause) {
this.clause = clause;
}
static <T> Value<T> where(final boolean clause) {
return new Value<>(clause);
}
static <T> Value<T> whereNot(final boolean clause) {
return where(!clause);
}
Value<T> then(final Supplier<T> trueSupplier) {
this.trueSupplier = trueSupplier;
return this;
}
T otherwise(final Supplier<T> falseSupplier) {
if (clause) {
return trueSupplier.get();
}
return falseSupplier.get();
}
Value<T> and(final boolean clause) {
this.clause = this.clause && clause;
return this;
}
Value<T> or(final boolean clause) {
this.clause = this.clause || clause;
return this;
}
Value<T> andNot(final boolean clause) {
return and(!clause);
}
Value<T> orNot(final boolean clause) {
return or(!clause);
}
}

228
src/test/java/net/kemitix/conditional/ValueTest.java Normal file
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package net.kemitix.conditional;
import org.junit.Test;
import static org.assertj.core.api.Assertions.assertThat;
/**
* @author Paul Campbell (pcampbell@kemitix.net).
*/
public class ValueTest {
private static final String TRUE = "true";
private static final String FALSE = "false";
@Test
public void valueWhereTrueIsTrue() {
//when
final String result = Value.<String>where(true).then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsTrue(result);
}
@Test
public void valueWhereFalseIsFalse() {
//when
final String result = Value.<String>where(false).then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsFalse(result);
}
@Test
public void valueWhereTrueAndTrueIsTrue() {
//when
final String result = Value.<String>where(true).and(true)
.then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsTrue(result);
}
@Test
public void valueWhereTrueAndFalseIsFalse() {
//when
final String result = Value.<String>where(true).and(false)
.then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsFalse(result);
}
@Test
public void valueWhereFalseAndTrueIsFalse() {
//when
final String result = Value.<String>where(false).and(true)
.then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsFalse(result);
}
@Test
public void valueWhereFalseAndFalseIsFalse() {
//when
final String result = Value.<String>where(false).and(false)
.then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsFalse(result);
}
@Test
public void valueWhereTrueOrTrueIsTrue() {
//when
final String result = Value.<String>where(true).or(true)
.then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsTrue(result);
}
@Test
public void valueWhereTrueOrFalseIsTrue() {
//when
final String result = Value.<String>where(true).or(false)
.then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsTrue(result);
}
@Test
public void valueWhereFalseOrTrueIsTrue() {
//when
final String result = Value.<String>where(false).or(true)
.then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsTrue(result);
}
@Test
public void valueWhereFalseOrFalseIsFalse() {
//when
final String result = Value.<String>where(false).or(false)
.then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsFalse(result);
}
@Test
public void valueWhereNotTrueIsFalse() {
//when
final String result = Value.<String>whereNot(true).then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsFalse(result);
}
@Test
public void valueWhereNotFalseIsTrue() {
//when
final String result = Value.<String>whereNot(false).then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsTrue(result);
}
@Test
public void valueWhereTrueAndNotTrueIsFalse() {
//when
final String result = Value.<String>where(true).andNot(true)
.then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsFalse(result);
}
@Test
public void valueWhereTrueAndNotFalseIsTrue() {
//when
final String result = Value.<String>where(true).andNot(false)
.then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsTrue(result);
}
@Test
public void valueWhereFalseAndNotTrueIsFalse() {
//when
final String result = Value.<String>where(false).andNot(true)
.then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsFalse(result);
}
@Test
public void valueWhereFalseAndNotFalseIsFalse() {
//when
final String result = Value.<String>where(false).andNot(false)
.then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsFalse(result);
}
@Test
public void valueWhereTrueOrNotTrueIsTrue() {
//when
final String result = Value.<String>where(true).orNot(true)
.then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsTrue(result);
}
@Test
public void valueWhereTrueOrNotFalseIsTrue() {
//when
final String result = Value.<String>where(true).orNot(false)
.then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsTrue(result);
}
@Test
public void valueWhereFalseOrNotTrueIsFalse() {
//when
final String result = Value.<String>where(false).orNot(true)
.then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsFalse(result);
}
@Test
public void valueWhereFalseOrNotFalseIsTrue() {
//when
final String result = Value.<String>where(false).orNot(false)
.then(this::isTrue)
.otherwise(this::isFalse);
//then
thenIsTrue(result);
}
private String isTrue() {
return TRUE;
}
private String isFalse() {
return FALSE;
}
private void thenIsFalse(final String result) {
assertThat(result).isEqualTo(isFalse());
}
private void thenIsTrue(final String result) {
assertThat(result).isEqualTo(TRUE);
}
}