de.thingweb.typesystem.TypeSystemChecker.java Source code

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Here is the source code for de.thingweb.typesystem.TypeSystemChecker.java

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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 Siemens AG and the thingweb community
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package de.thingweb.typesystem;

import java.util.Arrays;
import java.util.List;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.JsonNodeType;

/**
 * The idea is to provide a simple mean to decide which type-system is used in a
 * TD (e.g., XML schema datatype, JSON schema, et cetera).
 * 
 * @author https://github.com/danielpeintner
 * 
 *
 */
public class TypeSystemChecker {

    public static TypeSystem getTypeSystem(JsonNode type) {
        TypeSystem ts = TypeSystem.UNKNOWN;

        if (isXmlSchemaType(type)) {
            ts = TypeSystem.XML_SCHEMA_DATATYPES;
        } else if (isSchemaOrg(type)) {
            ts = TypeSystem.SCHEMA_ORG;
        } else if (isJsonSchemaType(type)) {
            ts = TypeSystem.JSON_SCHEMA;
        }
        return ts;
    }

    public static boolean isXmlSchemaType(JsonNode type) {
        boolean isXsd = false;

        if (type != null && type.getNodeType() == JsonNodeType.STRING) {
            // very naive and simple for now
            isXsd = type.asText().trim().startsWith("xsd:");
        }

        return isXsd;
    }

    public static boolean isSchemaOrg(JsonNode type) {
        boolean isSchemaOrg = false;

        // TODO check how schema.org types are referenced/used
        return isSchemaOrg;
    }

    /** JSON Schema defines seven primitive types for JSON values (see http://json-schema.org/latest/json-schema-core.html#anchor8) */
    static final List<String> JSON_SCHEMA_PRIMITIVE_TYPES = Arrays.asList("array", "boolean", "integer", "number",
            "null", "object", "string");

    public static boolean isJsonSchemaType(JsonNode type) {
        boolean isJsonSchema = false;

        // TODO use JSON schema parser
        if (type != null && type.getNodeType() == JsonNodeType.OBJECT) {
            JsonNode value = type.findValue("type");
            if (value != null) {
                isJsonSchema = JSON_SCHEMA_PRIMITIVE_TYPES.contains(value.asText());
            }
        }

        return isJsonSchema;

    }

}