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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 java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;

import com.fasterxml.jackson.core.JsonPointer;
import com.fasterxml.jackson.databind.JsonNode;
import com.networknt.url.URLNormalizer;


public class ReferenceManager {

	private ReferenceRegistry registry;
	private URL docUrl;
	private JsonNode doc = null;
	private Map> positions = new HashMap<>();

	public ReferenceManager() {
		this((URL) null, (JsonLoader) null);
	}

	public ReferenceManager(URL rootUrl) {
		this(rootUrl, (JsonLoader) null);
	}

	public ReferenceManager(URL rootUrl, JsonLoader loader) {
		this.registry = new ReferenceRegistry(loader);
		this.docUrl = rootUrl != null ? normalize(rootUrl, true) : null;
		if (docUrl != null) {
			registry.registerManager(docUrl, this);
		}
	}

	public ReferenceManager(URL rootUrl, JsonNode preloadedDoc, JsonLoader loader) {
		this(rootUrl, loader);
		this.doc = preloadedDoc;
	}

	private ReferenceManager(URL baseUrl, ReferenceRegistry registry) {
		this.docUrl = baseUrl;
		this.registry = registry;
	}

	public Reference getDocReference() {
		return getReference(docUrl.toString());
	}

	public ReferenceManager getManagerFor(URL url) {
		URL normalized = normalize(url, true);
		ReferenceManager manager = registry.getManager(normalized);
		if (manager == null) {
			manager = new ReferenceManager(normalized, registry);
			registry.registerManager(normalized, manager);
		}
		return manager;
	}

	public Reference getReference(JsonNode refNode) {
		String refString = refNode.get("$ref").asText();
		return getReference(refString);
	}

	public Reference getReference(String refString) {
		try {
			URL url = new URL(docUrl, refString);
			String fragment = url.getRef();
			ReferenceManager manager = getManagerFor(url);
			return new Reference(refString, fragment, normalize(url, false).toString(), manager);
		} catch (MalformedURLException e) {
			return new Reference(refString, new ResolutionException(null, e), null);
		}
	}

	public Optional getPositionInfo(JsonPointer pointer) {
		if (!positions.containsKey(pointer)) {
			positions.put(pointer, registry.getPositionInfo(docUrl.toString(), pointer));
		}
		return positions.get(pointer);
	}

	public JsonNode loadDoc() throws IOException {
		if (doc == null) {
			doc = registry.loadDoc(docUrl);
		}
		return doc;
	}

	public ReferenceRegistry getRegistry() {
		return registry;
	}

	private static URL normalize(URL url, boolean noFrag) {
		if (url != null) {
			URLNormalizer normalizer = new URLNormalizer(url.toString()) //
					.lowerCaseSchemeHost() //
					.upperCaseEscapeSequence() //
					.decodeUnreservedCharacters() //
					.removeDefaultPort() //
					.encodeNonURICharacters() //
					.removeDotSegments();
			if (noFrag) {
				normalizer = normalizer.removeFragment();
			}
			return normalizer.toURL();
		} else {
			return null;
		}
	}
}