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Camel XSLT Saxon component

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.camel.component.xslt.saxon;

import java.util.List;
import java.util.Map;

import javax.xml.XMLConstants;

import net.sf.saxon.Configuration;
import net.sf.saxon.TransformerFactoryImpl;
import net.sf.saxon.lib.ExtensionFunctionDefinition;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

final class XsltSaxonHelper {

    private static final Logger LOG = LoggerFactory.getLogger(XsltSaxonHelper.class);

    private XsltSaxonHelper() {
    }

    public static void registerSaxonConfiguration(TransformerFactoryImpl factory, Configuration saxonConfiguration) {
        if (saxonConfiguration != null) {
            factory.setConfiguration(saxonConfiguration);
        }
    }

    public static void registerSaxonConfigurationProperties(
            TransformerFactoryImpl factory,
            Map saxonConfigurationProperties) {
        if (saxonConfigurationProperties != null && !saxonConfigurationProperties.isEmpty()) {
            for (Map.Entry entry : saxonConfigurationProperties.entrySet()) {
                factory.getConfiguration().setConfigurationProperty(entry.getKey(), entry.getValue());
            }
        }
    }

    public static void registerSaxonExtensionFunctions(
            TransformerFactoryImpl factory,
            List