/*
* Copyright 2003-2011 JetBrains s.r.o.
*
* 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 jetbrains.mps.util;
import org.jetbrains.annotations.NotNull;
import java.util.AbstractList;
import java.util.Arrays;
public abstract class ArrayWrapper<T> extends AbstractList<T> {
private T[] myArray;
protected ArrayWrapper() {
myArray = getArray();
}
@Override
public T get(int index) {
return myArray[index];
}
@Override
public T set(int index, @NotNull T element) {
T oldItem = myArray[index];
myArray[index] = element;
return oldItem;
}
@Override
public void add(int index, @NotNull T element) {
T[] oldArray = myArray;
T[] newArray = newArray(oldArray.length + 1);
System.arraycopy(oldArray, 0, newArray, 0, index);
newArray[index] = element;
System.arraycopy(oldArray, index, newArray, index + 1, oldArray.length - index);
myArray = newArray;
setArray(newArray);
}
@Override
public T remove(int index) {
T oldItem = myArray[index];
T[] oldArray = myArray;
T[] newArray = newArray(oldArray.length - 1);
System.arraycopy(oldArray, 0, newArray, 0, index);
System.arraycopy(oldArray, index + 1, newArray, index, oldArray.length - index - 1);
myArray = newArray;
setArray(newArray);
return oldItem;
}
@Override
public int indexOf(Object o) {
int len = myArray.length;
for (int i = 0; i < len; i++) {
if (myArray[i] == o) return i;
}
return -1;
}
@Override
public Object[] toArray() {
return Arrays.copyOf(myArray, size());
}
@Override
public <T> T[] toArray(T[] a) {
if (a.length < size()) {
// Make a new array of a's runtime type, but my contents:
return (T[]) Arrays.copyOf(myArray, size(), a.getClass());
}
System.arraycopy(myArray, 0, a, 0, size());
if (a.length > size()) {
a[size()] = null;
}
return a;
}
@Override
public int size() {
return myArray.length;
}
protected abstract T[] getArray();
protected abstract void setArray(T[] newArray);
protected abstract T[] newArray(int size);
}