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Streaming API for EDI for Java
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/*******************************************************************************
 * Copyright 2017 xlate.io LLC, http://www.xlate.io
 *
 * 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 io.xlate.edi.internal.schema;

import java.io.IOException;
import java.io.InputStream;
import java.io.UncheckedIOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Enumeration;
import java.util.Map;
import java.util.Map.Entry;
import java.util.NavigableMap;
import java.util.Properties;
import java.util.TreeMap;

import io.xlate.edi.schema.EDISchemaException;
import io.xlate.edi.schema.Schema;
import io.xlate.edi.schema.SchemaFactory;
import io.xlate.edi.stream.EDIStreamConstants.Standards;

public class SchemaUtils {

    private SchemaUtils() {
    }

    static Properties controlIndex = new Properties();
    static NavigableMap controlVersions = new TreeMap<>();
    static NavigableMap controlSchemas = new TreeMap<>();

    static {
        try {
            Enumeration resources = getStreams("staedi-control-index.properties");

            while (resources.hasMoreElements()) {
                try (InputStream stream = resources.nextElement().openStream()) {
                    controlIndex.load(stream);
                }
            }
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        }

        for (Map.Entry entry : controlIndex.entrySet()) {
            final String standardVersion = entry.getKey().toString();
            final String schemaPath = entry.getValue().toString();

            controlVersions.put(standardVersion, schemaPath);
            controlSchemas.put(standardVersion, null);
        }
    }

    static Enumeration getStreams(String resource) throws IOException {
        ClassLoader loader = SchemaUtils.class.getClassLoader();
        return loader.getResources(resource);
    }

    static URL getURL(String resource) {
        return SchemaUtils.class.getResource(resource);
    }

    public static Schema getControlSchema(String standard, String[] version) throws EDISchemaException {
        String key;

        if (Standards.EDIFACT.equals(standard)) {
            key = standard + '.' + version[1] + (version.length > 4 ? '.' + version[4] : "");
        } else {
            key = standard + '.' + String.join(".", version);
        }

        Entry controlEntry = controlSchemas.floorEntry(key);

        if (isValidEntry(controlEntry, standard)) {
            return controlEntry.getValue();
        }

        Entry pathEntry = controlVersions.floorEntry(key);

        if (isValidEntry(pathEntry, standard)) {
            Schema created = getXmlSchema(pathEntry.getValue());
            controlSchemas.put(pathEntry.getKey(), created);
            return created;
        }

        return null;
    }

    static boolean isValidEntry(Entry entry, String standard) {
        if (entry == null) {
            return false;
        }
        if (!entry.getKey().startsWith(standard)) {
            return false;
        }
        return entry.getValue() != null;
    }

    private static Schema getXmlSchema(String resource) throws EDISchemaException {
        final URL location = getURL(resource);
        final URL locationContext;

        try {
            final String external = location.toExternalForm();
            locationContext = new URL(external.substring(0, external.lastIndexOf('/') + 1));
        } catch (MalformedURLException e) {
            throw new EDISchemaException("Unable to resolve schema location context", e);
        }

        SchemaFactory schemaFactory = SchemaFactory.newFactory();
        schemaFactory.setProperty(SchemaFactory.SCHEMA_LOCATION_URL_CONTEXT, locationContext);

        return schemaFactory.createSchema(location);
    }
}