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// Portions Copyright [2019] Payara Foundation and/or affiliates

package org.glassfish.admin.amx.util.stringifier;

import java.util.HashMap;
import java.util.Map;

/**
 * Holds a lookup table for Stringifiers. Certain Stringifier classes may use this registry to aid them in producing suitable output.
 */
public class StringifierRegistryImpl implements StringifierRegistry {

    public static final StringifierRegistry DEFAULT = new StringifierRegistryImpl();

    private final Map, Stringifier> mLookup;
    private final StringifierRegistry mNextRegistry;

    /**
     * Create a new registry with no next registry.
     */
    public StringifierRegistryImpl() {
        this(null);
    }

    /**
     * Create a new registry which is chained to an existing registry.
     *
     * When lookup() is called, if it cannot be found in this registry, then the chainee is used.
     *
     * @param registry	the registry to use if this registry fails to find a Stringifier
     */
    public StringifierRegistryImpl(final StringifierRegistry registry) {
        mLookup = new HashMap, Stringifier>();
        mNextRegistry = registry;
    }

    @Override
    public void add(final Class theClass, final Stringifier stringifier) {
        if (lookup(theClass) != null) {
            throw new IllegalArgumentException("Stringifier already registered for: " + theClass.getName());
        }

        mLookup.remove(theClass);
        mLookup.put(theClass, stringifier);
    }

    @Override
    public Stringifier lookup(final Class theClass) {
        Stringifier stringifier = mLookup.get(theClass);

        if (stringifier == null && mNextRegistry != null) {
            stringifier = mNextRegistry.lookup(theClass);
        }

        return (stringifier);
    }
}