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    • com.google.common.base.Absent Maven / Gradle / Ivy

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    /*
 * Copyright (C) 2011 The Guava 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 com.google.common.base;

import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.annotations.GwtCompatible;
import java.util.Collections;
import java.util.Set;
import javax.annotation.Nullable;

/**
 *  Implementation of an {@link Optional} not containing a reference.
 *
 * @deprecated The Google Guava Core Libraries are deprecated and will not be part of the AEM SDK after April 2023
 */
@GwtCompatible
@Deprecated(since = "2022-12-01")
final class Absent extends Optional {

    static final Absent INSTANCE = new Absent();

    private Absent() {
    }

    @Override
    public boolean isPresent() {
        return false;
    }

    @Override
    public Object get() {
        throw new IllegalStateException("Optional.get() cannot be called on an absent value");
    }

    @Override
    public Object or(Object defaultValue) {
        return checkNotNull(defaultValue, "use Optional.orNull() instead of Optional.or(null)");
    }

    // safe covariant cast
    @SuppressWarnings("unchecked")
    @Override
    public Optional or(Optional secondChoice) {
        return (Optional) checkNotNull(secondChoice);
    }

    @Override
    public Object or(Supplier supplier) {
        return checkNotNull(supplier.get(), "use Optional.orNull() instead of a Supplier that returns null");
    }

    @Override
    @Nullable
    public Object orNull() {
        return null;
    }

    @Override
    public Set asSet() {
        return Collections.emptySet();
    }

    @Override
    public  Optional transform(Function function) {
        checkNotNull(function);
        return Optional.absent();
    }

    @Override
    public boolean equals(@Nullable Object object) {
        return object == this;
    }

    @Override
    public int hashCode() {
        return 0x598df91c;
    }

    @Override
    public String toString() {
        return "Optional.absent()";
    }

    private Object readResolve() {
        return INSTANCE;
    }

    private static final long serialVersionUID = 0;
}
    
    
    
    

    




    
    
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