extensions/support/common/runtime/src/main/java/org/apache/camel/quarkus/support/common/runtime/graal/SubstituteBeansWeakCache.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.camel.quarkus.support.common.runtime.graal;

import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.util.Map;
import java.util.WeakHashMap;

import com.oracle.svm.core.annotate.Substitute;
import com.oracle.svm.core.annotate.TargetClass;

@TargetClass(className = "com.sun.beans.WeakCache")
@Substitute
final class SubstituteBeansWeakCache<K, V> {

    @Substitute
    private Map<K, Reference<V>> map = new WeakHashMap<>();

    @Substitute
    public SubstituteBeansWeakCache() {
    }

    @Substitute
    public V get(K key) {
        Reference<V> reference = this.map.get(key);
        if (reference == null) {
            return null;
        }
        V value = reference.get();
        if (value == null) {
            this.map.remove(key);
        }
        return value;
    }

    @Substitute
    public void put(K key, V value) {
        if (value != null) {
            this.map.put(key, new WeakReference<V>(value));
        } else {
            this.map.remove(key);
        }
    }

    @Substitute
    public void clear() {
        this.map.clear();
    }

}