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A more performant JSON-LD 1.1 Processor & API forked from Titanium JSON-LD.
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/*
 * 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.api;

import jakarta.json.JsonObject;
import no.hasmac.jsonld.JsonLdError;
import no.hasmac.jsonld.JsonLdOptions;
import no.hasmac.jsonld.JsonLdVersion;
import no.hasmac.jsonld.document.Document;
import no.hasmac.jsonld.loader.DocumentLoader;
import no.hasmac.jsonld.processor.CompactionProcessor;

import java.net.URI;

public final class CompactionApi implements CommonApi, LoaderApi {

    // required
    private final Document document;
    private final URI documentUri;
    private final Document context;
    private final URI contextUri;

    // optional
    private JsonLdOptions options;

    public CompactionApi(URI documentUri, Document context) {
        this.document = null;
        this.documentUri = documentUri;
        this.context = context;
        this.contextUri = null;
        this.options = new JsonLdOptions();
    }

    public CompactionApi(URI documentUri, URI contextUri) {
        this.document = null;
        this.documentUri = documentUri;
        this.context = null;
        this.contextUri = contextUri;
        this.options = new JsonLdOptions();
    }

    public CompactionApi(Document document, Document context) {
        this.document = document;
        this.documentUri = null;
        this.context = context;
        this.contextUri = null;
        this.options = new JsonLdOptions();
    }

    public CompactionApi(Document document, URI contextUri) {
        this.document = document;
        this.documentUri = null;
        this.context = null;
        this.contextUri = contextUri;
        this.options = new JsonLdOptions();
    }

    @Override
    public CompactionApi options(JsonLdOptions options) {

        if (options == null) {
            throw new IllegalArgumentException("Parameter 'options' is null.");
        }

        this.options = options;
        return this;
    }

    @Override
    public CompactionApi mode(JsonLdVersion processingMode) {
        options.setProcessingMode(processingMode);
        return this;
    }

    @Override
    public CompactionApi base(URI baseUri) {
        options.setBase(baseUri);
        return this;
    }

    /**
     * If set to true, the processor replaces arrays with just one
     * element  If set to false, all arrays will remain arrays even if they have just one
     * element. true by default.
     *
     * @param enable
     * @return builder instance
     */
    public CompactionApi compactArrays(boolean enable) {
        options.setCompactArrays(enable);
        return this;
    }

    /**
     * The processor replaces arrays with just one element.
     *
     * @return {@link CompactionApi} instance
     */
    public CompactionApi compactArrays() {
        return compactArrays(true);
    }

    /**
     * Determines if IRIs are compacted relative to the {@link #base(URI)} or document location .
     * true by default.
     *
     * @param enable
     * @return builder instance
     */
    public CompactionApi compactToRelative(boolean enable) {
        options.setCompactToRelative(enable);
        return this;
    }

    /**
     * IRIs are compacted relative to the {@link #base(URI)} or document location.
     *
     * @return builder instance
     */
    public CompactionApi compactToRelative() {
        return compactToRelative(true);
    }

    @Override
    public CompactionApi loader(DocumentLoader loader) {
        options.setDocumentLoader(loader);
        return this;
    }

    @Override
    public CompactionApi ordered(boolean enable) {
        options.setOrdered(enable);
        return this;
    }

    /**
     * Experimental: Enables JSON-LD-STAR extension. Disabled by default.
     *
     * @see JSON-LD-STAR Draft
     *
     * @return builder instance
     */
    public CompactionApi rdfStar() {
        options.setRdfStar(true);
        return this;
    }

    /**
     * Get the result of compaction.
     *
     * @return {@link JsonObject} representing compacted document
     * @throws JsonLdError
     */
    public JsonObject get() throws JsonLdError {

        if (document != null) {
            if (context != null)  {
                return CompactionProcessor.compact(document, context, options);
            }
            if (contextUri != null) {
                return CompactionProcessor.compact(document, contextUri, options);
            }
        }

        if (documentUri != null) {
            if (context != null)  {
                return CompactionProcessor.compact(documentUri, context, options);
            }
            if (contextUri != null)  {
                return CompactionProcessor.compact(documentUri, contextUri, options);
            }
        }

        throw new IllegalStateException();
    }
}