/*
* Copyright 2014 the original author or authors.
*
* 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 org.gradle.model.internal.manage.schema.cache;
import com.google.common.base.Function;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import org.gradle.internal.Cast;
import java.lang.ref.WeakReference;
import java.util.List;
class MultiWeakClassSet extends WeakClassSet {
private static final Function<Class<?>, WeakReference<Class<?>>> TO_WEAK_REF = new Function<Class<?>, WeakReference<Class<?>>>() {
@Override
public WeakReference<Class<?>> apply(Class<?> input) {
return new WeakReference<Class<?>>(input);
}
};
private static final Function<WeakReference<Class<?>>, Object> UNPACK_REF = new Function<WeakReference<Class<?>>, Object>() {
@Override
public Object apply(WeakReference<Class<?>> input) {
return input.get();
}
};
private final List<WeakReference<Class<?>>> references;
private final int hash;
MultiWeakClassSet(List<Class<?>> classes) {
this.references = Lists.newArrayList(Iterables.transform(classes, TO_WEAK_REF));
this.hash = classes.hashCode();
}
@Override
public int hashCode() {
return hash;
}
@Override
public boolean equals(Object obj) {
if (obj instanceof MultiWeakClassSet) {
MultiWeakClassSet other = Cast.uncheckedCast(obj);
if (other.references.size() == references.size()) {
return Iterables.elementsEqual(
Iterables.transform(other.references, UNPACK_REF),
Iterables.transform(references, UNPACK_REF)
);
}
}
return false;
}
@Override
boolean isCollected() {
for (WeakReference<Class<?>> reference : references) {
if (reference.get() == null) {
return true;
}
}
return false;
}
}