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/*-
 * ========================LICENSE_START=================================
 * smooks-edi-sax
 * %%
 * Copyright (C) 2020 Smooks
 * %%
 * Licensed under the terms of the Apache License Version 2.0, or
 * the GNU Lesser General Public License version 3.0 or later.
 *
 * SPDX-License-Identifier: Apache-2.0 OR LGPL-3.0-or-later
 *
 * ======================================================================
 *
 * 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.
 *
 * ======================================================================
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
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 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
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package org.smooks.edi.edisax.registry;

import java.io.IOException;
import java.util.LinkedHashMap;
import java.util.Map;

import org.smooks.edi.edisax.EDIConfigurationException;
import org.smooks.edi.edisax.model.EdifactModel;
import org.smooks.edi.edisax.util.EDIUtils;
import org.smooks.edi.edisax.model.internal.Delimiters;
import org.xml.sax.SAXException;


/**
 * Base implementation of {@link MappingsRegistry} interface
 *
 * @author zubairov
 */
public abstract class AbstractMappingsRegistry implements MappingsRegistry {

    /**
     * Internal storage
     */
    protected final Map content = new LinkedHashMap();

    /**
     * {@inheritDoc}
     */
    public EdifactModel getMappingModel(String messageName,
                                        Delimiters delimiters) throws EDIConfigurationException, SAXException, IOException {
        String[] nameComponents = EDIUtils.split(messageName,
                delimiters.getComponent(), delimiters.getEscape());
        StringBuilder lookupNameBuilder = new StringBuilder();
        // First 4 components are mandatory...we use those as the lookup...
        for (int i = 0; i < 4; i++) {
            if (i > 0) {
                lookupNameBuilder.append(':');
            }
            lookupNameBuilder.append(nameComponents[i]);
        }
        String lookupName = lookupNameBuilder.toString().trim();
        EdifactModel result = content.get(lookupName);
        if (result == null) {
            synchronized (content) {
                result = content.get(lookupName);
                if (result == null) {
                    content.putAll(demandLoading(nameComponents));
                }
            }
            // Try again
            result = content.get(lookupName);
            if (result != null) {
                return result;
            }
        } else {
            return result;
        }
        throw new EDIConfigurationException("Mapping Model '" + messageName
                + "' not found in supplied set of Mapping model.");
    }

    /**
     * Loading mapping models on demand.
     * This method should return either one or many mapping models
     * loaded on-demand or just eagerly.
     *
     * @param nameComponents
     * @return
     * @throws SAXException
     * @throws IOException
     * @throws EDIConfigurationException
     */
    protected abstract Map demandLoading(String[] nameComponents) throws EDIConfigurationException, IOException, SAXException;


}