/*
* Copyright 2000-2012 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 com.intellij.util.keyFMap;
import com.intellij.openapi.util.Key;
import org.jetbrains.annotations.NotNull;
class OneElementFMap<V> implements KeyFMap {
private final int myKeyCode;
private final V myValue;
OneElementFMap(int keyCode, @NotNull V value) {
myKeyCode = keyCode;
myValue = value;
}
@NotNull
@Override
public <V> KeyFMap plus(@NotNull Key<V> key, @NotNull V value) {
int keyCode = key.hashCode();
if (myKeyCode == keyCode) return new OneElementFMap<V>(keyCode, value);
return new PairElementsFMap(myKeyCode, myValue, keyCode, value);
}
@NotNull
@Override
public KeyFMap minus(@NotNull Key<?> key) {
if (key.hashCode() == myKeyCode) {
return KeyFMap.EMPTY_MAP;
}
return this;
}
@Override
public <V> V get(@NotNull Key<V> key) {
//noinspection unchecked
return myKeyCode == key.hashCode() ? (V)myValue : null;
}
@Override
public String toString() {
return "<"+Key.getKeyByIndex(myKeyCode) + " -> " + myValue+">";
}
@Override
public boolean isEmpty() {
return false;
}
}