org.ejml.data.IGrowArray Maven / Gradle / Ivy
/*
* Copyright (c) 2009-2018, Peter Abeles. All Rights Reserved.
*
* This file is part of Efficient Java Matrix Library (EJML).
*
* 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 org.ejml.data;
/**
* An integer array which can have its size changed
*
* @author Peter Abeles
*/
public class IGrowArray {
public int data[];
public int length;
public IGrowArray(int length) {
this.data = new int[length];
this.length = length;
}
public IGrowArray() {
this(0);
}
public int length() {
return length;
}
public void reshape( int length ) {
if( data.length < length ) {
data = new int[length];
}
this.length = length;
}
/**
* Increases the internal array's length by the specified amount. Previous values are preserved
* @param amount Number of elements added to the internal array's length
*/
public void grow( int amount ) {
int tmp[] = new int[ data.length + amount ];
System.arraycopy(data,0,tmp,0,data.length);
this.data = tmp;
}
public void set( IGrowArray original ) {
reshape(original.length);
System.arraycopy(original.data,0,data,0,original.length);
}
public int get( int index ) {
if( index < 0 || index >= length )
throw new IllegalArgumentException("Out of bounds");
return data[index];
}
public void set( int index , int value ) {
if( index< 0 || index >= length )
throw new IllegalArgumentException("Out of bounds");
data[index] = value;
}
public void free() {
data = new int[0];
length = 0;
}
}