com.pdd.pop.ext.glassfish.grizzly.memory.AbstractBufferArray Maven / Gradle / Ivy
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package com.pdd.pop.ext.glassfish.grizzly.memory;
import java.lang.reflect.Array;
import java.util.Arrays;
/**
*
* @author oleksiys
*/
public abstract class AbstractBufferArray {
protected final Class clazz;
private E[] byteBufferArray;
private PosLim[] initStateArray;
private int size;
protected abstract void setPositionLimit(E buffer, int position, int limit);
protected abstract int getPosition(E buffer);
protected abstract int getLimit(E buffer);
@SuppressWarnings("unchecked")
protected AbstractBufferArray(Class clazz) {
this.clazz = clazz;
byteBufferArray = (E[]) Array.newInstance(clazz, 4);
initStateArray = new PosLim[4];
}
public void add(final E byteBuffer) {
add(byteBuffer, getPosition(byteBuffer), getLimit(byteBuffer));
}
public void add(final E byteBuffer, final int restorePosition,
final int restoreLimit) {
ensureCapacity(1);
byteBufferArray[size] = byteBuffer;
PosLim poslim = initStateArray[size];
if (poslim == null) {
poslim = new PosLim();
initStateArray[size] = poslim;
}
poslim.initialPosition = getPosition(byteBuffer);
poslim.initialLimit = getLimit(byteBuffer);
poslim.restorePosition = restorePosition;
poslim.restoreLimit = restoreLimit;
size++;
}
public E[] getArray() {
return byteBufferArray;
}
public void restore() {
for (int i = 0; i < size; i++) {
final PosLim poslim = initStateArray[i];
setPositionLimit(byteBufferArray[i],
poslim.restorePosition, poslim.restoreLimit);
}
}
public final int getInitialPosition(final int idx) {
return initStateArray[idx].initialPosition;
}
public int getInitialLimit(final int idx) {
return initStateArray[idx].initialLimit;
}
public final int getInitialBufferSize(final int idx) {
return getInitialLimit(idx) - getInitialPosition(idx);
}
public int size() {
return size;
}
private void ensureCapacity(final int grow) {
final int diff = byteBufferArray.length - size;
if (diff >= grow) {
return;
}
final int newSize = Math.max(diff + size, (byteBufferArray.length * 3) / 2 + 1);
byteBufferArray = Arrays.copyOf(byteBufferArray, newSize);
initStateArray = Arrays.copyOf(initStateArray, newSize);
}
public void reset() {
Arrays.fill(byteBufferArray, 0, size, null);
size = 0;
}
public void recycle() {
reset();
}
private final static class PosLim {
int initialPosition;
int initialLimit;
int restorePosition;
int restoreLimit;
}
}