com.redhat.lightblue.util.DefaultRegistry Maven / Gradle / Ivy

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/*
 Copyright 2013 Red Hat, Inc. and/or its affiliates.

 This file is part of lightblue.

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see .
 */
package com.redhat.lightblue.util;

import java.io.Serializable;

import java.util.Map;
import java.util.HashMap;
import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;

/**
 * Default implementation of the registry interface
 */
public class DefaultRegistry implements Registry, Serializable {
    private final List> resolvers = new ArrayList<>();
    private final Map items = new HashMap<>();

    @Override
    public void add(K key, V value) {
        items.put(key, value);
    }

    @Override
    public void add(Resolver resolver) {
        resolvers.add(resolver);
    }

    public void mergeWith(DefaultRegistry parser) {
        for (Object o : parser.resolvers) {
            Resolver r = (Resolver) o;
            if (!this.resolvers.contains(r)) {
                this.resolvers.add(r);
            }
        }
        Iterator it = parser.items.entrySet().iterator();
        while (it.hasNext()) {
            Map.Entry pair = (Map.Entry) it.next();
            if (!items.containsKey(pair.getKey())) {
                items.put((K) pair.getKey(), (V) pair.getValue());
            }
        }
    }

    @Override
    public V find(K name) {
        V value = items.get(name);
        if (value == null) {
            for (Resolver x : resolvers) {
                value = x.find(name);
                if (value != null) {
                    break;
                }
            }
        }
        return value;
    }
}