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a-base is a library of basic (hence the name) classes, most notably immutable collection classes with copy-on-write operations

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package com.ajjpj.abase.collection.immutable;

import com.ajjpj.abase.function.AFunction1;

/**
 * @author arno
 */
class AMapWithDefault extends AWrappedMap {
    private final AFunction1 defaultFunction;

    AMapWithDefault(AMap inner, AFunction1 defaultFunction) {
        super(inner);
        this.defaultFunction = defaultFunction;
    }

    @Override AMap wrap(AMap inner) {
        return new AMapWithDefault<>(inner, defaultFunction);
    }

    @Override V defaultValue(K key) {
        return defaultFunction.apply(key);
    }
}