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package com.googlecode.javaewah32;

/*

* Copyright 2009-2016, Daniel Lemire, Cliff Moon, David McIntosh, Robert Becho, Google Inc., Veronika Zenz, Owen Kaser, Gregory Ssi-Yan-Kai, Rory Graves

* Licensed under the Apache License, Version 2.0.

*/

import java.util.Arrays;

/**

* Int array wrapper.

* Users should not be concerned by this class.

*

* @author Gregory Ssi-Yan-Kai

*/

class IntArray implements Buffer32, Cloneable {

/**

* Creates a buffer with default size

*/

public IntArray() {

this(DEFAULT_BUFFER_SIZE);

}

/**

* Creates a buffer with explicit size

* @param bufferSize

*/

public IntArray(int bufferSize) {

if(bufferSize < 1) {

bufferSize = 1;

}

this.buffer = new int[bufferSize];

}

@Override

public int sizeInWords() {

return this.actualSizeInWords;

}

@Override

public void ensureCapacity(int capacity) {

resizeBuffer(capacity - this.actualSizeInWords);

}

@Override

public int getWord(int position) {

return this.buffer[position];

}

@Override

public int getLastWord() {

return getWord(this.actualSizeInWords - 1);

}

@Override

public void clear() {

this.actualSizeInWords = 1;

this.buffer[0] = 0;

}

@Override

public void trim() {

this.buffer = Arrays.copyOf(this.buffer, this.actualSizeInWords);

}

@Override

public void setWord(int position, int word) {

this.buffer[position] = word;

}

@Override

public void setLastWord(int word) {

setWord(this.actualSizeInWords - 1, word);

}

@Override

public void push_back(int word) {

resizeBuffer(1);

this.buffer[this.actualSizeInWords++] = word;

}

@Override

public void push_back(Buffer32 buffer, int start, int number) {

resizeBuffer(number);

if(buffer instanceof IntArray) {

int[] data = ((IntArray)buffer).buffer;

System.arraycopy(data, start, this.buffer, this.actualSizeInWords, number);

} else {

for(int i = 0; i < number; ++i) {

this.buffer[this.actualSizeInWords + i] = buffer.getWord(start + i);

}

}

this.actualSizeInWords += number;

}

@Override

public void negative_push_back(Buffer32 buffer, int start, int number) {

resizeBuffer(number);

for (int i = 0; i < number; ++i) {

this.buffer[this.actualSizeInWords + i] = ~buffer.getWord(start + i);

}

this.actualSizeInWords += number;

}

@Override

public void removeLastWord() {

setWord(--this.actualSizeInWords, 0);

}

@Override

public void negateWord(int position) {

this.buffer[position] = ~this.buffer[position];

}

@Override

public void andWord(int position, int mask) {

this.buffer[position] &= mask;

}

@Override

public void orWord(int position, int mask) {

this.buffer[position] |= mask;

}

@Override

public void andLastWord(int mask) {

andWord(this.actualSizeInWords - 1, mask);

}

@Override

public void orLastWord(int mask) {

orWord(this.actualSizeInWords - 1, mask);

}

@Override

public void expand(int position, int length) {

resizeBuffer(length);

System.arraycopy(this.buffer, position, this.buffer, position + length, this.actualSizeInWords - position);

this.actualSizeInWords += length;

}

@Override

public void collapse(int position, int length) {

System.arraycopy(this.buffer, position + length, this.buffer, position, this.actualSizeInWords - position - length);

for(int i = 0; i < length; ++i) {

removeLastWord();

}

}

@Override

public IntArray clone() {

IntArray clone = null;

try {

clone = (IntArray) super.clone();

clone.buffer = this.buffer.clone();

clone.actualSizeInWords = this.actualSizeInWords;

} catch (CloneNotSupportedException e) {

e.printStackTrace(); // cannot happen

}

return clone;

}

@Override

public void swap(final Buffer32 other) {

if(other instanceof IntArray) {

int[] tmp = this.buffer;

this.buffer = ((IntArray) other).buffer;

((IntArray) other).buffer = tmp;

int tmp2 = this.actualSizeInWords;

this.actualSizeInWords = ((IntArray) other).actualSizeInWords;

((IntArray) other).actualSizeInWords = tmp2;

} else {

int[] tmp = new int[other.sizeInWords()];

for(int i = 0; i < other.sizeInWords(); ++i) {

tmp[i] = other.getWord(i);

}

int tmp2 = other.sizeInWords();

other.clear();

other.removeLastWord();

other.push_back(this, 0, this.sizeInWords());

this.buffer = tmp;

this.actualSizeInWords = tmp2;

}

}

/**

* Resizes the buffer if the number of words to add exceeds the buffer capacity.

* @param number the number of words to add

*/

private void resizeBuffer(int number) {

int size = newSizeInWords(number);

if (size >= this.buffer.length) {

int oldBuffer[] = this.buffer;

this.buffer = new int[size];

System.arraycopy(oldBuffer, 0, this.buffer, 0, oldBuffer.length);

}

}

/**

* Returns the resulting buffer size in words given the number of words to add.

* @param number the number of words to add

*/

private int newSizeInWords(int number) {

int size = this.actualSizeInWords + number;

if (size >= this.buffer.length) {

if (size < 32768)

size = size * 2;

else if (size * 3 / 2 < size) // overflow

size = Integer.MAX_VALUE;

else

size = size * 3 / 2;

}

return size;

}

/**

* The actual size in words.

*/

private int actualSizeInWords = 1;

/**

* The buffer (array of 32-bit words)

*/

private int buffer[] = null;

/**

* The Constant DEFAULT_BUFFER_SIZE: default memory allocation when the

* object is constructed.

*/

private static final int DEFAULT_BUFFER_SIZE = 4;

}