package org.apache.lucene.util;
/**
* 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.
*/
/** Represents int[], as a slice (offset + length) into an
* existing int[].
*
* @lucene.internal */
public final class IntsRef {
public int[] ints;
public int offset;
public int length;
public IntsRef() {
}
public IntsRef(int capacity) {
ints = new int[capacity];
}
public IntsRef(int[] ints, int offset, int length) {
this.ints = ints;
this.offset = offset;
this.length = length;
}
public IntsRef(IntsRef other) {
copy(other);
}
@Override
public Object clone() {
return new IntsRef(this);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 0;
final int end = offset + length;
for(int i = offset; i < end; i++) {
result = prime * result + ints[i];
}
return result;
}
@Override
public boolean equals(Object other) {
return this.intsEquals((IntsRef) other);
}
public boolean intsEquals(IntsRef other) {
if (length == other.length) {
int otherUpto = other.offset;
final int[] otherInts = other.ints;
final int end = offset + length;
for(int upto=offset;upto<end;upto++,otherUpto++) {
if (ints[upto] != otherInts[otherUpto]) {
return false;
}
}
return true;
} else {
return false;
}
}
public void copy(IntsRef other) {
if (ints == null) {
ints = new int[other.length];
} else {
ints = ArrayUtil.grow(ints, other.length);
}
System.arraycopy(other.ints, other.offset, ints, 0, other.length);
length = other.length;
offset = 0;
}
public void grow(int newLength) {
if (ints.length < newLength) {
ints = ArrayUtil.grow(ints, newLength);
}
}
}