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A light-weight, fast OpenAPI 3.0 parser and validator
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/*******************************************************************************
 *  Copyright (c) 2017 ModelSolv, Inc. and others.
 *  All rights reserved. This program and the accompanying materials
 *  are made available under the terms of the Eclipse Public License v1.0
 *  which accompanies this distribution, and is available at
 *  http://www.eclipse.org/legal/epl-v10.html
 *
 *  Contributors:
 *     ModelSolv, Inc. - initial API and implementation and/or initial documentation
 *******************************************************************************/
package com.networknt.oas.jsonoverlay;

import com.fasterxml.jackson.databind.JsonNode;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

public class ResolutionBase {

	private String urlString;
	private Boolean isValid = null;
	private ResolutionException error = null;
	private JsonNode json = null;
	private final ResolutionBaseRegistry resolutionBaseRegistry;

	/* package */ ResolutionBase(String urlString, ResolutionBaseRegistry resolutionBaseRegistry) {
		this.urlString = urlString;
		this.isValid = null;
		this.resolutionBaseRegistry = resolutionBaseRegistry;
	}

	/* package */ ResolutionBase(String urlString, ResolutionException e,
			ResolutionBaseRegistry resolutionBaseRegistry) {
		this.urlString = urlString;
		this.isValid = false;
		this.error = e;
		this.resolutionBaseRegistry = resolutionBaseRegistry;
	}

	/* package */ ResolutionBase(String urlString, JsonNode json, ResolutionBaseRegistry resolutionBaseRegistry) {
		this.urlString = urlString;
		this.json = json;
		this.isValid = true;
		this.resolutionBaseRegistry = resolutionBaseRegistry;
	}

	public JsonNode getJson() {
		return json;
	}

	public String getUrlString() {
		return urlString;
	}

	public boolean isResolved() {
		return isValid != null;
	}

	public boolean isValid() {
		return isValid != null && isValid;
	}

	public boolean isInvalid() {
		return isValid != null && !isValid;
	}

	public ResolutionException getError() {
		return error;
	}

	public String getErrorReason() {
		return error != null ? error.getLocalizedMessage() : null;
	}

	public JsonNode resolve() {
		if (isValid == null) {
			try {
				json = resolutionBaseRegistry.getJsonLoader().load(new URL(urlString));
				isValid = true;
			} catch (IOException e) {
				isValid = false;
				error = new ResolutionException(String.format("Failed to load document from '%s'", urlString), e);
				throw error;
			}
		} else if (isInvalid()) {
			throw error;
		}
		return json;
	}

	public String comprehend(String basedUrlString) {
		String fragment = "";
		if (basedUrlString.contains("#")) {
			int pos = basedUrlString.indexOf('#');
			fragment = basedUrlString.substring(pos);
			basedUrlString = basedUrlString.substring(0, pos);
		}
		try {
			URL url = new URL(new URL(urlString), basedUrlString);
			return url.toString() + fragment;
		} catch (MalformedURLException e) {
			throw new ResolutionException(
					String.format("Failed to comprehend reference string '%s' relative to resolution base '%s'",
							basedUrlString + fragment, urlString),
					e);
		}
	}

	public ResolutionBaseRegistry getResolutionBaseRegistry() {
		return resolutionBaseRegistry;
	}
}