com.github.haixing_hu.ilibrary.service.impl.DocumentTemplateServiceImpl.java Source code

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/*
 * Copyright (c) 2014  Haixing Hu
 *
 * 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 com.github.haixing_hu.ilibrary.service.impl;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.dao.DataAccessException;

import com.github.haixing_hu.ilibrary.model.DocumentTemplate;
import com.github.haixing_hu.ilibrary.model.DocumentType;
import com.github.haixing_hu.ilibrary.service.DocumentTemplateService;

/**
 * Implements the {@link DocumentTemplateService} interface.
 *
 * @author Haixing Hu
 */
public final class DocumentTemplateServiceImpl implements DocumentTemplateService {

    private final Logger logger;
    private final Map<String, DocumentTemplate> templates;

    public DocumentTemplateServiceImpl(final String resourcePattern) {
        logger = LoggerFactory.getLogger(DocumentTemplateServiceImpl.class);
        templates = new HashMap<String, DocumentTemplate>();
        //  load all the field templates
        final PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        try {
            final JAXBContext context = JAXBContext.newInstance(DocumentTemplate.class);
            final Unmarshaller unmarshaller = context.createUnmarshaller();
            final Resource[] resources = resolver.getResources(resourcePattern);
            for (final Resource resource : resources) {
                final InputStream is = resource.getInputStream();
                final DocumentTemplate document = (DocumentTemplate) unmarshaller.unmarshal(is);
                final String name = document.getName();
                logger.info("Adds a document template: {}", name);
                templates.put(name, document);
            }
        } catch (final Exception e) {
            logger.error("Failed to load the document templates from: {}", resourcePattern, e);
            throw new RuntimeException(e);
        }
    }

    @Override
    public Collection<DocumentTemplate> getAll() throws DataAccessException {
        return templates.values();
    }

    @Override
    public Collection<DocumentTemplate> getAll(final DocumentType type) throws DataAccessException {
        final List<DocumentTemplate> result = new ArrayList<DocumentTemplate>();
        for (final DocumentTemplate template : templates.values()) {
            if (template.getType() == type) {
                result.add(template);
            }
        }
        return result;
    }

    @Override
    public DocumentTemplate get(final String name) throws DataAccessException {
        return templates.get(name);
    }

}