no.hasmac.jsonld.flattening.BlankNodeIdGenerator Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of hasmac-json-ld Show documentation

A more performant JSON-LD 1.1 Processor & API forked from Titanium JSON-LD.

The newest version!

/*
 * Copyright 2020 APICATALOG and HASMAC.
 *
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

package no.hasmac.jsonld.flattening;

import no.hasmac.jsonld.StringUtils;

import java.util.HashMap;
import java.util.Map;

/**
 *
 * @see Generate Blank Node Identifier
 */
public final class BlankNodeIdGenerator {

    private final Map map;

    private int counter;

    public BlankNodeIdGenerator() {
        this.map = new HashMap<>();
        this.counter = 0;
    }

    public String createIdentifier() {
     return "_:b" + counter++;
    }

    public String createIdentifier(String identifier) {
        if (identifier == null || StringUtils.isBlank(identifier)) {
            return createIdentifier();
        }

        return map.computeIfAbsent(identifier, x -> createIdentifier());

    }

}