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Library providing immutable/persistent collection classes for Java. While collections are immutable they provide methods for adding and removing values by creating new modified copies of themselves. Each copy shares almost all of its structure with other copies to minimize memory consumption.

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// Burton Computer Corporation
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package org.javimmutable.collections;

/**
 * Interface for containers that associate keys with values.
 *
 * @param 
 * @param 
 */
public interface Mapped
{
    /**
     * Return the value associated with key or null if no value is associated.
     * Note that if null is an acceptable value to the container then this method
     * will be ambiguous and find() should be used instead.
     *
     * @param key identifies the value to retrieve
     * @return value associated with key or null if no value is associated
     */
    V get(K key);

    /**
     * Return the value associated with key or defaultValue if no value is associated.
     * Note that if defaultValue is an acceptable value to the container then this method
     * will be ambiguous and find() should be used instead.
     *
     * @param key          identifies the value to retrieve
     * @param defaultValue value to return if no entry exists for key
     * @return value associated with key or defaultValue if no value is associated
     */
    V getValueOr(K key,
                 V defaultValue);

    /**
     * Return a Holder containing the value associated wth the key or an empty
     * Holder if no value is associated with the key.
     *
     * @param key identifies the value to retrieve
     * @return possibly empty Holder containing any value associated with the key
     */
    Holder find(K key);
}