org.roda.core.SchemasCacheLoader.java Source code

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Here is the source code for org.roda.core.SchemasCacheLoader.java

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/**
 * The contents of this file are subject to the license and copyright
 * detailed in the LICENSE file at the root of the source
 * tree and available online at
 *
 * https://github.com/keeps/roda
 */
package org.roda.core;

import java.io.InputStream;
import java.util.Optional;

import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;

import org.apache.commons.lang3.StringUtils;
import org.roda.core.common.RodaUtils;
import org.roda.core.common.validation.ResourceResolver;
import org.roda.core.data.common.RodaConstants;
import org.roda.core.data.v2.common.Pair;

import com.google.common.cache.CacheLoader;

public class SchemasCacheLoader extends CacheLoader<Pair<String, String>, Optional<Schema>> {
    @Override
    public Optional<Schema> load(Pair<String, String> pair) throws Exception {
        String metadataType = pair.getFirst();
        String metadataTypeLowerCase = metadataType.toLowerCase();
        String metadataVersion = pair.getSecond();
        String metadataVersionLowerCase = "";
        if (metadataVersion != null) {
            metadataVersionLowerCase = metadataVersion.toLowerCase();
        }

        String schemaFileName;
        if (StringUtils.isNotEmpty(metadataVersion)) {
            schemaFileName = metadataTypeLowerCase + RodaConstants.METADATA_VERSION_SEPARATOR
                    + metadataVersionLowerCase + ".xsd";
        } else {
            schemaFileName = metadataTypeLowerCase + ".xsd";
        }

        String schemaPath = RodaConstants.CORE_SCHEMAS_FOLDER + "/" + schemaFileName;

        InputStream schemaStream = RodaCoreFactory.getConfigurationFileAsStream(schemaPath);

        Schema xmlSchema = null;
        try {
            SchemaFactory schemaFactory = SchemaFactory.newInstance(RodaConstants.W3C_XML_SCHEMA_NS_URI);
            schemaFactory.setResourceResolver(new ResourceResolver());
            xmlSchema = schemaFactory.newSchema(new StreamSource(schemaStream));
        } finally {
            RodaUtils.closeQuietly(schemaStream);
        }

        return Optional.ofNullable(xmlSchema);
    }
}