com.github.ykiselev.gfx.sprite.font.chars.CharRange Maven / Gradle / Ivy
/*
* Copyright 2017 Yuriy Kiselev ([email protected])
*
* Licensed 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 com.github.ykiselev.gfx.sprite.font.chars;
import java.util.Comparator;
import java.util.Objects;
import java.util.function.Supplier;
/**
* Created by Uze on 07.01.2015.
*/
public final class CharRange implements Supplier, Comparable {
private static final Comparator COMPARATOR = Comparator.comparing(CharRange::start)
.thenComparing(CharRange::end);
private final char start;
private final char end;
public char start() {
return start;
}
public char end() {
return end;
}
public int getLength() {
return end - start + 1;
}
public CharRange(char start, char end) {
if (start > end) {
throw new IllegalArgumentException("start > end");
}
this.start = start;
this.end = end;
}
@Override
public char[] get() {
final char[] result = new char[getLength()];
for (char i = start; i <= end; i++) {
result[i - start] = i;
}
return result;
}
@Override
public int compareTo(CharRange o) {
return COMPARATOR.compare(this, o);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
CharRange charRange = (CharRange) o;
return start == charRange.start &&
end == charRange.end;
}
@Override
public int hashCode() {
return Objects.hash(start, end);
}
@Override
public String toString() {
return "CharRange{" +
"start=" + start +
", end=" + end +
'}';
}
/**
* Tries to merge two ranges.
*
* @param r the other range
* @return the new merged range or {@code null}
*/
public CharRange join(CharRange r) {
// before this
if (r.end < start) {
return null;
}
// after this
if (r.start > end) {
return null;
}
// this range starts before or with other
if (start <= r.start) {
// this range completely covers other
if (end >= r.end) {
return this;
} else {
return new CharRange(start, r.end);
}
}
return r.join(this);
}
}