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/*
 * Copyright 2013 the original author or 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 org.nosceon.connellite;

import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicReference;

/**
 * @author Johan Siebens
 */
final class NodeRef {

    private final AtomicReference ref = new AtomicReference<>(Node.newNode());

    public NodeRef() {
    }

    public Node node() {
        return ref.get();
    }

    public NodeRef(NodeRef nodeRef) {
        this.ref.set(nodeRef.ref.get());
    }

    public int hashCode(String path) {
        Node node = node(path);
        return node == null ? -1 : node.hashCode();
    }

    public void set(Node node) {
        this.ref.set(node);
    }

    public int size(String path) {
        Node node = node(path);
        return node == null ? -1 : node.size();
    }

    public Map toMap(String path) {
        return ref.get().node(path).toMap();
    }

    public String value(String path) {
        Node node = node(path);
        return node == null ? null : node.value();
    }

    public List values(String path) {
        Node node = node(path);
        return node == null ? emptyList() : node.values();
    }

    private List emptyList() {
        return Collections. emptyList();
    }

    private Node node(String path) {
        return ref.get().node(path);
    }

}