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A fork of RepreZen JsonOverlay with all dependencies and code generation removed

There is a newer version: 2.1.38

/*********************************************************************
 *  Copyright (c) 2017 ModelSolv, Inc. and others.
 *
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which is available at https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 *  Contributors:
 *     ModelSolv, Inc.
 *     - initial API and implementation and/or initial documentation
 **********************************************************************/
package com.networknt.jsonoverlay;

import com.fasterxml.jackson.databind.JsonNode;

public class RefOverlay {

	private Reference reference;
	private JsonOverlay parent;
	private JsonOverlay target = null;
	private OverlayFactory factory;
	private ReferenceManager refMgr;

	public RefOverlay(JsonNode json, JsonOverlay parent, OverlayFactory factory, ReferenceManager refMgr) {
		this.reference = refMgr.getReference(json);
		this.parent = parent; // parent of reference, not parent of referent
		this.factory = factory;
		this.refMgr = refMgr;
	}

	public RefOverlay(Reference reference, JsonOverlay parent, OverlayFactory factory, ReferenceManager refMgr) {
		this.reference = reference;
		this.parent = parent;
		this.factory = factory;
		this.refMgr = refMgr;
	}

	/* package */JsonOverlay getOverlay() {
		if (!reference.isResolved()) {
			reference.resolve();
		}
		if (target == null && reference.isValid()) {
			ReferenceRegistry registry = refMgr.getRegistry();
			{
				@SuppressWarnings("unchecked")
				JsonOverlay castTarget = (JsonOverlay) registry.getOverlay(reference.getNormalizedRef(),
						factory.getSignature());
				this.target = castTarget;
			}
			if (target == null) {
				@SuppressWarnings("unchecked")
				JsonOverlay castTarget = (JsonOverlay) registry.getOverlay(reference.getJson(),
						factory.getSignature());
				this.target = castTarget;
			}
			if (target == null) {
				target = factory.create(reference.getJson(), null, reference.getManager());
				target._setCreatingRef(reference);
				refMgr.getRegistry().register(reference.getNormalizedRef(), factory.getSignature(), target);
			}
		}
		return target;
	}

	public V _get(boolean elaborate) {
		getOverlay();
		return target != null ? target._get(elaborate) : null;
	}

	public Reference _getReference() {
		return reference;
	}

	public JsonOverlay _getParent() {
		return parent;
	}
}