eaglercraft-1.8/sources/main/java/org/apache/commons/lang3/Range.java
2022-12-25 01:12:28 -08:00

617 lines
17 KiB
Java

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.lang3;
import java.io.Serializable;
import java.util.Comparator;
import net.lax1dude.eaglercraft.v1_8.HString;
/**
* <p>
* An immutable range of objects from a minimum to maximum point inclusive.
* </p>
*
* <p>
* The objects need to either be implementations of {@code Comparable} or you
* need to supply a {@code Comparator}.
* </p>
*
* <p>
* #ThreadSafe# if the objects and comparator are thread-safe
* </p>
*
* @param <T> The type of range values.
* @since 3.0
*/
public final class Range<T> implements Serializable {
@SuppressWarnings({ "rawtypes", "unchecked" })
private enum ComparableComparator implements Comparator {
INSTANCE;
/**
* Comparable based compare implementation.
*
* @param obj1 left hand side of comparison
* @param obj2 right hand side of comparison
* @return negative, 0, positive comparison value
*/
@Override
public int compare(final Object obj1, final Object obj2) {
return ((Comparable) obj1).compareTo(obj2);
}
}
/**
* Serialization version.
*
* @see java.io.Serializable
*/
private static final long serialVersionUID = 1L;
/**
* <p>
* Obtains a range with the specified minimum and maximum values (both
* inclusive).
* </p>
*
* <p>
* The range uses the natural ordering of the elements to determine where values
* lie in the range.
* </p>
*
* <p>
* The arguments may be passed in the order (min,max) or (max,min). The
* getMinimum and getMaximum methods will return the correct values.
* </p>
*
* @param <T> the type of the elements in this range
* @param fromInclusive the first value that defines the edge of the range,
* inclusive
* @param toInclusive the second value that defines the edge of the range,
* inclusive
* @return the range object, not null
* @throws IllegalArgumentException if either element is null
* @throws ClassCastException if the elements are not {@code Comparable}
*/
public static <T extends Comparable<T>> Range<T> between(final T fromInclusive, final T toInclusive) {
return between(fromInclusive, toInclusive, null);
}
/**
* <p>
* Obtains a range with the specified minimum and maximum values (both
* inclusive).
* </p>
*
* <p>
* The range uses the specified {@code Comparator} to determine where values lie
* in the range.
* </p>
*
* <p>
* The arguments may be passed in the order (min,max) or (max,min). The
* getMinimum and getMaximum methods will return the correct values.
* </p>
*
* @param <T> the type of the elements in this range
* @param fromInclusive the first value that defines the edge of the range,
* inclusive
* @param toInclusive the second value that defines the edge of the range,
* inclusive
* @param comparator the comparator to be used, null for natural ordering
* @return the range object, not null
* @throws IllegalArgumentException if either element is null
* @throws ClassCastException if using natural ordering and the elements
* are not {@code Comparable}
*/
public static <T> Range<T> between(final T fromInclusive, final T toInclusive, final Comparator<T> comparator) {
return new Range<>(fromInclusive, toInclusive, comparator);
}
/**
* <p>
* Obtains a range using the specified element as both the minimum and maximum
* in this range.
* </p>
*
* <p>
* The range uses the natural ordering of the elements to determine where values
* lie in the range.
* </p>
*
* @param <T> the type of the elements in this range
* @param element the value to use for this range, not null
* @return the range object, not null
* @throws IllegalArgumentException if the element is null
* @throws ClassCastException if the element is not {@code Comparable}
*/
public static <T extends Comparable<T>> Range<T> is(final T element) {
return between(element, element, null);
}
/**
* <p>
* Obtains a range using the specified element as both the minimum and maximum
* in this range.
* </p>
*
* <p>
* The range uses the specified {@code Comparator} to determine where values lie
* in the range.
* </p>
*
* @param <T> the type of the elements in this range
* @param element the value to use for this range, must not be {@code null}
* @param comparator the comparator to be used, null for natural ordering
* @return the range object, not null
* @throws IllegalArgumentException if the element is null
* @throws ClassCastException if using natural ordering and the elements
* are not {@code Comparable}
*/
public static <T> Range<T> is(final T element, final Comparator<T> comparator) {
return between(element, element, comparator);
}
/**
* The ordering scheme used in this range.
*/
private final Comparator<T> comparator;
/**
* Cached output hashCode (class is immutable).
*/
private transient int hashCode;
/**
* The maximum value in this range (inclusive).
*/
private final T maximum;
/**
* The minimum value in this range (inclusive).
*/
private final T minimum;
/**
* Cached output toString (class is immutable).
*/
private transient String toString;
/**
* Creates an instance.
*
* @param element1 the first element, not null
* @param element2 the second element, not null
* @param comp the comparator to be used, null for natural ordering
*/
@SuppressWarnings("unchecked")
private Range(final T element1, final T element2, final Comparator<T> comp) {
if (element1 == null || element2 == null) {
throw new IllegalArgumentException(
"Elements in a range must not be null: element1=" + element1 + ", element2=" + element2);
}
if (comp == null) {
this.comparator = ComparableComparator.INSTANCE;
} else {
this.comparator = comp;
}
if (this.comparator.compare(element1, element2) < 1) {
this.minimum = element1;
this.maximum = element2;
} else {
this.minimum = element2;
this.maximum = element1;
}
}
/**
* <p>
* Checks whether the specified element occurs within this range.
* </p>
*
* @param element the element to check for, null returns false
* @return true if the specified element occurs within this range
*/
public boolean contains(final T element) {
if (element == null) {
return false;
}
return comparator.compare(element, minimum) > -1 && comparator.compare(element, maximum) < 1;
}
/**
* <p>
* Checks whether this range contains all the elements of the specified range.
* </p>
*
* <p>
* This method may fail if the ranges have two different comparators or element
* types.
* </p>
*
* @param otherRange the range to check, null returns false
* @return true if this range contains the specified range
* @throws RuntimeException if ranges cannot be compared
*/
public boolean containsRange(final Range<T> otherRange) {
if (otherRange == null) {
return false;
}
return contains(otherRange.minimum) && contains(otherRange.maximum);
}
/**
* <p>
* Checks where the specified element occurs relative to this range.
* </p>
*
* <p>
* The API is reminiscent of the Comparable interface returning {@code -1} if
* the element is before the range, {@code 0} if contained within the range and
* {@code 1} if the element is after the range.
* </p>
*
* @param element the element to check for, not null
* @return -1, 0 or +1 depending on the element's location relative to the range
*/
public int elementCompareTo(final T element) {
// Comparable API says throw NPE on null
Validate.notNull(element, "element");
if (isAfter(element)) {
return -1;
} else if (isBefore(element)) {
return 1;
} else {
return 0;
}
}
// Element tests
// --------------------------------------------------------------------
/**
* <p>
* Compares this range to another object to test if they are equal.
* </p>
* .
*
* <p>
* To be equal, the minimum and maximum values must be equal, which ignores any
* differences in the comparator.
* </p>
*
* @param obj the reference object with which to compare
* @return true if this object is equal
*/
@Override
public boolean equals(final Object obj) {
if (obj == this) {
return true;
} else if (obj == null || obj.getClass() != getClass()) {
return false;
} else {
@SuppressWarnings("unchecked") // OK because we checked the class above
final Range<T> range = (Range<T>) obj;
return minimum.equals(range.minimum) && maximum.equals(range.maximum);
}
}
/**
* <p>
* Gets the comparator being used to determine if objects are within the range.
* </p>
*
* <p>
* Natural ordering uses an internal comparator implementation, thus this method
* never returns null. See {@link #isNaturalOrdering()}.
* </p>
*
* @return the comparator being used, not null
*/
public Comparator<T> getComparator() {
return comparator;
}
/**
* <p>
* Gets the maximum value in this range.
* </p>
*
* @return the maximum value in this range, not null
*/
public T getMaximum() {
return maximum;
}
/**
* <p>
* Gets the minimum value in this range.
* </p>
*
* @return the minimum value in this range, not null
*/
public T getMinimum() {
return minimum;
}
/**
* <p>
* Gets a suitable hash code for the range.
* </p>
*
* @return a hash code value for this object
*/
@Override
public int hashCode() {
int result = hashCode;
if (hashCode == 0) {
result = 17;
result = 37 * result + getClass().hashCode();
result = 37 * result + minimum.hashCode();
result = 37 * result + maximum.hashCode();
hashCode = result;
}
return result;
}
/**
* Calculate the intersection of {@code this} and an overlapping Range.
*
* @param other overlapping Range
* @return range representing the intersection of {@code this} and {@code other}
* ({@code this} if equal)
* @throws IllegalArgumentException if {@code other} does not overlap
* {@code this}
* @since 3.0.1
*/
public Range<T> intersectionWith(final Range<T> other) {
if (!this.isOverlappedBy(other)) {
throw new IllegalArgumentException(
HString.format("Cannot calculate intersection with non-overlapping range %s", other));
}
if (this.equals(other)) {
return this;
}
final T min = getComparator().compare(minimum, other.minimum) < 0 ? other.minimum : minimum;
final T max = getComparator().compare(maximum, other.maximum) < 0 ? maximum : other.maximum;
return between(min, max, getComparator());
}
/**
* <p>
* Checks whether this range is after the specified element.
* </p>
*
* @param element the element to check for, null returns false
* @return true if this range is entirely after the specified element
*/
public boolean isAfter(final T element) {
if (element == null) {
return false;
}
return comparator.compare(element, minimum) < 0;
}
/**
* <p>
* Checks whether this range is completely after the specified range.
* </p>
*
* <p>
* This method may fail if the ranges have two different comparators or element
* types.
* </p>
*
* @param otherRange the range to check, null returns false
* @return true if this range is completely after the specified range
* @throws RuntimeException if ranges cannot be compared
*/
public boolean isAfterRange(final Range<T> otherRange) {
if (otherRange == null) {
return false;
}
return isAfter(otherRange.maximum);
}
/**
* <p>
* Checks whether this range is before the specified element.
* </p>
*
* @param element the element to check for, null returns false
* @return true if this range is entirely before the specified element
*/
public boolean isBefore(final T element) {
if (element == null) {
return false;
}
return comparator.compare(element, maximum) > 0;
}
/**
* <p>
* Checks whether this range is completely before the specified range.
* </p>
*
* <p>
* This method may fail if the ranges have two different comparators or element
* types.
* </p>
*
* @param otherRange the range to check, null returns false
* @return true if this range is completely before the specified range
* @throws RuntimeException if ranges cannot be compared
*/
public boolean isBeforeRange(final Range<T> otherRange) {
if (otherRange == null) {
return false;
}
return isBefore(otherRange.minimum);
}
/**
* <p>
* Checks whether this range ends with the specified element.
* </p>
*
* @param element the element to check for, null returns false
* @return true if the specified element occurs within this range
*/
public boolean isEndedBy(final T element) {
if (element == null) {
return false;
}
return comparator.compare(element, maximum) == 0;
}
/**
* <p>
* Whether or not the Range is using the natural ordering of the elements.
* </p>
*
* <p>
* Natural ordering uses an internal comparator implementation, thus this method
* is the only way to check if a null comparator was specified.
* </p>
*
* @return true if using natural ordering
*/
public boolean isNaturalOrdering() {
return comparator == ComparableComparator.INSTANCE;
}
/**
* <p>
* Checks whether this range is overlapped by the specified range.
* </p>
*
* <p>
* Two ranges overlap if there is at least one element in common.
* </p>
*
* <p>
* This method may fail if the ranges have two different comparators or element
* types.
* </p>
*
* @param otherRange the range to test, null returns false
* @return true if the specified range overlaps with this range; otherwise,
* {@code false}
* @throws RuntimeException if ranges cannot be compared
*/
public boolean isOverlappedBy(final Range<T> otherRange) {
if (otherRange == null) {
return false;
}
return otherRange.contains(minimum) || otherRange.contains(maximum) || contains(otherRange.minimum);
}
/**
* <p>
* Checks whether this range starts with the specified element.
* </p>
*
* @param element the element to check for, null returns false
* @return true if the specified element occurs within this range
*/
public boolean isStartedBy(final T element) {
if (element == null) {
return false;
}
return comparator.compare(element, minimum) == 0;
}
/**
* <p>
* Fits the given element into this range by returning the given element or, if
* out of bounds, the range minimum if below, or the range maximum if above.
* </p>
*
* <pre>
* Range&lt;Integer&gt; range = Range.between(16, 64);
* range.fit(-9) --&gt; 16
* range.fit(0) --&gt; 16
* range.fit(15) --&gt; 16
* range.fit(16) --&gt; 16
* range.fit(17) --&gt; 17
* ...
* range.fit(63) --&gt; 63
* range.fit(64) --&gt; 64
* range.fit(99) --&gt; 64
* </pre>
*
* @param element the element to check for, not null
* @return the minimum, the element, or the maximum depending on the element's
* location relative to the range
* @since 3.10
*/
public T fit(final T element) {
// Comparable API says throw NPE on null
Validate.notNull(element, "element");
if (isAfter(element)) {
return minimum;
} else if (isBefore(element)) {
return maximum;
} else {
return element;
}
}
/**
* <p>
* Gets the range as a {@code String}.
* </p>
*
* <p>
* The format of the String is '[<i>min</i>..<i>max</i>]'.
* </p>
*
* @return the {@code String} representation of this range
*/
@Override
public String toString() {
if (toString == null) {
toString = "[" + minimum + ".." + maximum + "]";
}
return toString;
}
/**
* <p>
* Formats the receiver using the given format.
* </p>
*
* <p>
* This uses {@link java.util.Formattable} to perform the formatting. Three
* variables may be used to embed the minimum, maximum and comparator. Use
* {@code %1$s} for the minimum element, {@code %2$s} for the maximum element
* and {@code %3$s} for the comparator. The default format used by
* {@code toString()} is {@code [%1$s..%2$s]}.
* </p>
*
* @param format the format string, optionally containing {@code %1$s},
* {@code %2$s} and {@code %3$s}, not null
* @return the formatted string, not null
*/
public String toString(final String format) {
return HString.format(format, minimum, maximum, comparator);
}
}