/*
* Copyright 2000-2014 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.semantic;
import com.intellij.util.ArrayUtil;
import com.intellij.util.containers.ContainerUtil;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Type-safe key for access to {@link SemElement}.
* <p/>
* Use {@link #createKey(String, SemKey[])} to create a new "root" key, on which you can attach "sub"-keys via
* {@link #subKey(String, SemKey[])}.
*
* @author peter
*/
public class SemKey<T extends SemElement> {
private static final AtomicInteger counter = new AtomicInteger(0);
private final String myDebugName;
@NotNull private final SemKey<? super T>[] mySupers;
private final List<SemKey> myInheritors = ContainerUtil.createEmptyCOWList();
private final int myUniqueId;
@SafeVarargs
private SemKey(String debugName, @NotNull SemKey<? super T>... supers) {
myDebugName = debugName;
mySupers = supers;
myUniqueId = counter.getAndIncrement();
myInheritors.add(this);
registerInheritor(this);
}
private void registerInheritor(SemKey eachParent) {
for (SemKey<?> superKey : eachParent.mySupers) {
superKey.myInheritors.add(this);
registerInheritor(superKey);
}
}
@NotNull
public SemKey<? super T>[] getSupers() {
return mySupers;
}
public List<SemKey> getInheritors() {
return myInheritors;
}
public boolean isKindOf(SemKey<?> another) {
if (another == this) return true;
for (final SemKey<? super T> superKey : mySupers) {
if (superKey.isKindOf(another)) {
return true;
}
}
return false;
}
@Override
public String toString() {
return myDebugName;
}
@SafeVarargs
public static <T extends SemElement> SemKey<T> createKey(String debugName, @NotNull SemKey<? super T>... supers) {
return new SemKey<>(debugName, supers);
}
@Override
public int hashCode() {
return myUniqueId;
}
public int getUniqueId() {
return myUniqueId;
}
@SafeVarargs
public final <K extends T> SemKey<K> subKey(@NonNls String debugName, @NotNull SemKey<? super T>... otherSupers) {
if (otherSupers.length == 0) {
return new SemKey<>(debugName, this);
}
return new SemKey<>(debugName, ArrayUtil.append(otherSupers, this));
}
}