73 lines
1.9 KiB
Java
73 lines
1.9 KiB
Java
package it.cavallium.warppi.math.rules.dsl.patterns;
|
|
|
|
import it.cavallium.warppi.math.Function;
|
|
import it.cavallium.warppi.math.MathContext;
|
|
import it.cavallium.warppi.math.functions.Negative;
|
|
import it.cavallium.warppi.math.functions.Number;
|
|
import it.cavallium.warppi.math.rules.dsl.Pattern;
|
|
import it.cavallium.warppi.math.rules.dsl.VisitorPattern;
|
|
|
|
import java.math.BigDecimal;
|
|
import java.util.Map;
|
|
import java.util.Objects;
|
|
import java.util.stream.Stream;
|
|
|
|
/**
|
|
* Matches and generates the negative of another pattern.
|
|
*/
|
|
public class NegativePattern extends VisitorPattern {
|
|
private final Pattern inner;
|
|
|
|
public NegativePattern(final Pattern inner) {
|
|
this.inner = inner;
|
|
}
|
|
|
|
@Override
|
|
public Boolean visit(final Negative negative, final Map<String, Function> subFunctions) {
|
|
return inner.match(negative.getParameter(), subFunctions);
|
|
}
|
|
|
|
@Override
|
|
public Boolean visit(final Number number, final Map<String, Function> subFunctions) {
|
|
final BigDecimal value = number.getTerm();
|
|
if (value.signum() >= 0) {
|
|
return false;
|
|
}
|
|
final Number absoluteValue = new Number(number.getMathContext(), value.abs());
|
|
return inner.match(absoluteValue, subFunctions);
|
|
}
|
|
|
|
@Override
|
|
public Function replace(final MathContext mathContext, final Map<String, Function> subFunctions) {
|
|
final Function newInner = inner.replace(mathContext, subFunctions);
|
|
|
|
if (newInner instanceof Number) {
|
|
return ((Number) newInner).multiply(new Number(mathContext, -1));
|
|
} else {
|
|
return new Negative(
|
|
mathContext,
|
|
inner.replace(mathContext, subFunctions)
|
|
);
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public Stream<SubFunctionPattern> getSubFunctions() {
|
|
return inner.getSubFunctions();
|
|
}
|
|
|
|
@Override
|
|
public boolean equals(final Object o) {
|
|
if (!(o instanceof NegativePattern)) {
|
|
return false;
|
|
}
|
|
final NegativePattern other = (NegativePattern) o;
|
|
return inner.equals(other.inner);
|
|
}
|
|
|
|
@Override
|
|
public int hashCode() {
|
|
return Objects.hash(inner);
|
|
}
|
|
}
|