net.whimxiqal.journey.VirtualMapImpl Maven / Gradle / Ivy
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/*
* MIT License
*
* Copyright (c) whimxiqal
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package net.whimxiqal.journey;
import java.util.Collections;
import java.util.Map;
import java.util.function.Supplier;
class VirtualMapImpl implements VirtualMap {
private final Supplier> supplier;
private final int size;
Map value;
VirtualMapImpl(Supplier> supplier, int size) {
if (size < 0) {
throw new IllegalArgumentException("A size may not be less than 0");
}
this.supplier = supplier;
this.size = size;
}
VirtualMapImpl(Map map) {
this.supplier = null;
value = map;
this.size = value.size();
}
@Override
public int size() {
return size;
}
@Override
public Map getAll() {
if (value == null) {
value = supplier.get();
}
return value;
}
}