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The Open Source Java API for CityGML
There is a newer version: 3.2.4
/*
 * citygml4j - The Open Source Java API for CityGML
 * https://github.com/citygml4j
 *
 * Copyright 2013-2025 Claus Nagel 
 *
 * 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.citygml4j.cityjson.model.metadata;

import org.citygml4j.cityjson.model.CityJSONVersion;
import org.citygml4j.cityjson.util.CityJSONPatterns;

import java.util.regex.Matcher;

public class ReferenceSystem {
    private final String authority;
    private final String version;
    private final int code;

    public ReferenceSystem(String authority, String version, int code) {
        this.authority = authority != null && !authority.isEmpty() ? authority : "EPSG";
        this.version = version != null && !version.isEmpty() ? version : "0";
        this.code = code;
    }

    public ReferenceSystem(String authority, int code) {
        this(authority, null, code);
    }

    public ReferenceSystem(int code) {
        this(null, code);
    }

    public static ReferenceSystem parse(String referenceSystem) {
        if (referenceSystem != null) {
            Matcher matcher = CityJSONPatterns.CRS_URL.matcher(referenceSystem);
            if (matcher.matches()) {
                return new ReferenceSystem(matcher.group(1), matcher.group(2), Integer.parseInt(matcher.group(3)));
            } else if (matcher.usePattern(CityJSONPatterns.CRS_URN).matches()) {
                return new ReferenceSystem(matcher.group(1), matcher.group(2), Integer.parseInt(matcher.group(3)));
            } else if (matcher.usePattern(CityJSONPatterns.CRS_SHORT).matches()) {
                return new ReferenceSystem(matcher.group(1), Integer.parseInt(matcher.group(2)));
            }
        }

        return null;
    }

    public String getAuthority() {
        return authority;
    }

    public String getVersion() {
        return version;
    }

    public int getCode() {
        return code;
    }

    public String toURL() {
        return "http://www.opengis.net/def/crs/" + authority + "/" + version + "/" + code;
    }

    public String toURN() {
        return "urn:ogc:def:crs:" + authority + ":" + (!version.equals("0") ? version : "") + ":" + code;
    }

    public String toURI(CityJSONVersion version) {
        return version == CityJSONVersion.v1_0 ?
                "urn:ogc:def:crs:EPSG::" + code :
                toURL();
    }
}