net.java.games.input.DataQueue Maven / Gradle / Ivy
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* Copyright 2002 Sun Microsystems, Inc. All rights reserved.
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package net.java.games.input;
/**
* @author elias
* @version 1.0
*/
final class DataQueue {
private final Object[] elements;
private int position;
private int limit;
public DataQueue(int size, Class element_type) {
this.elements= new Object[size];
for (int i = 0; i < elements.length; i++) {
try {
elements[i] = element_type.newInstance();
} catch (InstantiationException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
clear();
}
public final void clear() {
position = 0;
limit = elements.length;
}
public final int position() {
return position;
}
public final int limit() {
return limit;
}
public final Object get(int index) {
assert index < limit;
return elements[index];
}
public final Object get() {
if (!hasRemaining())
return null;
return get(position++);
}
public final void compact() {
int index = 0;
while (hasRemaining()) {
swap(position, index);
position++;
index++;
}
position = index;
limit = elements.length;
}
private final void swap(int index1, int index2) {
Object temp = elements[index1];
elements[index1] = elements[index2];
elements[index2] = temp;
}
public final void flip() {
limit = position;
position = 0;
}
public final boolean hasRemaining() {
return remaining() > 0;
}
public final int remaining() {
return limit - position;
}
public final void position(int position) {
this.position = position;
}
public final Object[] getElements() {
return elements;
}
}