cn.taketoday.aop.cglib.core.WeakCacheKey Maven / Gradle / Ivy

package cn.taketoday.aop.cglib.core;

import java.lang.ref.WeakReference;

/**
 * Allows to check for object equality, yet the class does not keep strong
 * reference to the target. {@link #equals(Object)} returns true if and only if
 * the reference is not yet expired and target objects are equal in terms of
 * {@link #equals(Object)}.
 * 
 * This an internal class, thus it might disappear in future cglib releases.
 *
 * @param 
 *            type of the reference
 */
@SuppressWarnings("all")
public class WeakCacheKey extends WeakReference {
	private final int hash;

	public WeakCacheKey(T referent) {
		super(referent);
		this.hash = referent.hashCode();
	}

	@Override
	public boolean equals(Object obj) {
		if (!(obj instanceof WeakCacheKey)) {
			return false;
		}
		Object ours = get();
		Object theirs = ((WeakCacheKey) obj).get();
		return ours != null && theirs != null && ours.equals(theirs);
	}

	@Override
	public int hashCode() {
		return hash;
	}

	@Override
	public String toString() {
		T t = get();
		return t == null ? "Clean WeakIdentityKey, hash: " + hash : t.toString();
	}
}