at.gv.egiz.bku.slcommands.impl.IdentityLinkTransformer.java Source code

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Here is the source code for at.gv.egiz.bku.slcommands.impl.IdentityLinkTransformer.java

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/*
 * Copyright 2011 by Graz University of Technology, Austria
 * MOCCA has been developed by the E-Government Innovation Center EGIZ, a joint
 * initiative of the Federal Chancellery Austria and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */

package at.gv.egiz.bku.slcommands.impl;

import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.xml.transform.Templates;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamSource;

import org.apache.commons.configuration.Configuration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ResourceLoaderAware;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;

import at.gv.egiz.bku.conf.MoccaConfigurationFacade;

public class IdentityLinkTransformer extends at.gv.egiz.idlink.IdentityLinkTransformer
        implements ResourceLoaderAware {

    private final Logger log = LoggerFactory.getLogger(IdentityLinkTransformer.class);

    /**
     * The configuration facade.
     */
    protected final ConfigurationFacade configurationFacade = new ConfigurationFacade();

    private class ConfigurationFacade implements MoccaConfigurationFacade {

        private Configuration configuration;
        private ResourceLoader resLoader;

        private final String ISSUER_TEMPLATE_CACHE = "IssuerTemplateCache";
        private final String ISSUER_TEMPLATE_CACHE_ENTRY = ISSUER_TEMPLATE_CACHE + ".entry";
        private final String ISSUER_TEMPLATE_CACHE_URLS = ISSUER_TEMPLATE_CACHE_ENTRY + ".url";
        private final String ISSUER_TEMPLATE_CACHE_RESOURCES = ISSUER_TEMPLATE_CACHE_ENTRY + ".resource";

        public Map<String, Templates> getIssuerTemplateCacheMap(TransformerFactory factory) {
            Map<String, Templates> templates = Collections.synchronizedMap(new HashMap<String, Templates>());
            List<Object> urls = configuration.getList(ISSUER_TEMPLATE_CACHE_URLS);
            List<Object> resources = configuration.getList(ISSUER_TEMPLATE_CACHE_RESOURCES);
            if (!urls.isEmpty() && (urls.size() == resources.size())) {
                for (int i = 0; i < urls.size(); ++i) {
                    if ((urls.get(i) == null) || (resources.get(i) == null))
                        continue;
                    String url = urls.get(i).toString();
                    String resource = resources.get(i).toString();
                    Resource templRes = resLoader.getResource(resource);
                    try {
                        Templates template = factory.newTemplates(new StreamSource(templRes.getInputStream()));
                        templates.put(url, template);
                    } catch (Exception e) {
                        log.error("Error initializing issuer template cache", e);
                    }
                }
            }
            return templates;
        }

        public void setResourceLoader(ResourceLoader resLoader) {
            this.resLoader = resLoader;
        }
    }

    @Override
    protected Map<String, Templates> getInitialTemplateMap() {
        Map<String, Templates> templateMap = configurationFacade.getIssuerTemplateCacheMap(factory);
        log.debug("IssuerTemplate cache initialized with {} elements", templateMap.size());
        return templateMap;
    }

    /**
     * @param configuration the configuration to set
     */
    public void setConfiguration(Configuration configuration) {
        configurationFacade.configuration = configuration;
    }

    @Override
    public void setResourceLoader(ResourceLoader resLoader) {
        configurationFacade.setResourceLoader(resLoader);
    }
}