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DGrowArray.java
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/
DGrowArray.java
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/*
* Copyright (c) 2022, 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;
/**
* A double array which can have its size changed
*
* @author Peter Abeles
*/
public class DGrowArray {
public double[] data;
public int length;
public DGrowArray( int length ) {
this.data = new double[length];
this.length = length;
}
public DGrowArray() {
this(0);
}
public int length() {
return length;
}
public void reset() {reshape(0);}
/**
* Changes the array's length and doesn't attempt to preserve previous values if a new array is required
*
* @param length New array length
*/
public DGrowArray reshape( int length ) {
if (data.length < length) {
data = new double[length];
}
this.length = length;
return this;
}
/**
* Increases the internal array's length by the specified amount. Previous values are preserved.
* The length value is not modified since this does not change the 'meaning' of the array, just
* increases the amount of data which can be stored in it.
*
* this.data = new data_type[ data.length + amount ]
*
* @param amount Number of elements added to the internal array's length
*/
public void growInternal( int amount ) {
double[] tmp = new double[data.length + amount];
System.arraycopy(data, 0, tmp, 0, data.length);
this.data = tmp;
}
public void setTo( DGrowArray original ) {
reshape(original.length);
System.arraycopy(original.data, 0, data, 0, original.length);
}
public void add( double value ) {
if (length >= data.length) {
growInternal(Math.min(500_000, data.length + 10));
}
data[length++] = value;
}
public double get( int index ) {
if (index < 0 || index >= length)
throw new IllegalArgumentException("Out of bounds");
return data[index];
}
public void set( int index, double value ) {
if (index < 0 || index >= length)
throw new IllegalArgumentException("Out of bounds");
data[index] = value;
}
public void free() {
data = new double[0];
length = 0;
}
}