org.eclipse.smila.lucene.internal.LuceneSchemaResolver.java Source code

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Here is the source code for org.eclipse.smila.lucene.internal.LuceneSchemaResolver.java

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/*******************************************************************************
 * Copyright (c) 2008, 2011 Attensity Europe GmbH and brox IT Solutions GmbH. All rights reserved. This program and the
 * accompanying materials are made available under the terms of the Eclipse Public License v1.0 which accompanies this
 * distribution, and is available at http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors: Georg Schmidt (brox IT-Solutions GmbH GmbH) - initial API and implementation
 **********************************************************************************************************************/
package org.eclipse.smila.lucene.internal;

import java.io.File;
import java.io.FileInputStream;
import java.util.HashSet;
import java.util.Set;

import org.apache.commons.io.IOUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.smila.lucene.ILuceneSchemaResolver;
import org.eclipse.smila.lucene.LuceneService;
import org.eclipse.smila.utils.config.ConfigUtils;
import org.eclipse.smila.utils.xml.SchemaResolver;

/**
 * @author August Georg Schmidt (BROX)
 * 
 */
public class LuceneSchemaResolver implements SchemaResolver, ILuceneSchemaResolver {

    private static final String[] KNOWN_SCHEMAS = { "IndexStructure.xsd", "DataDictionaryConnection.xsd",
            "AnyFinderSearchDateFieldParameter.xsd", "AnyFinderSearchNumberFieldParameter.xsd",
            "AnyFinderSearchTextFieldParameter.xsd", "AnyFinderAdvancedSearch.xsd", };

    /**
     * {@inheritDoc}
     * 
     * @see org.eclipse.smila.utils.xml.SchemaResolver#getSchemaByName(java.lang.String)
     */
    @Override
    public byte[] getSchemaByName(final String schemaName) {

        final Log log = LogFactory.getLog(getClass());

        final Set<String> schemas = new HashSet<String>();
        for (final String schema : KNOWN_SCHEMAS) {
            schemas.add("../xml/" + schema);
        }

        if (!schemas.contains(schemaName)) {
            // not responsible for schema loading.
            return null;
        }

        final File folder = ConfigUtils.getConfigFolder(LuceneService.BUNDLE_NAME, "xml");
        if (folder == null) {
            if (log.isErrorEnabled()) {
                log.error("unable to locate configuration folder [" + LuceneService.BUNDLE_NAME + "/xml]");
            }
            return null;
        }

        FileInputStream fis = null;
        final String fileName = folder.getPath() + "/" + schemaName;
        try {
            fis = new FileInputStream(fileName);
            final byte[] schema = IOUtils.toByteArray(fis);
            return schema;
        } catch (final Exception exception) {
            if (log.isErrorEnabled()) {
                log.error("unable to read schema file [" + fileName + "]", exception);
            }
            return null;
        } finally {
            IOUtils.closeQuietly(fis);
        }
    }

}