eu.scidipes.toolkits.palibrary.impl.jpa.CategoryConverter.java Source code

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Here is the source code for eu.scidipes.toolkits.palibrary.impl.jpa.CategoryConverter.java

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/*
 * Copyright (c) 2011-2014 Alliance for Permanent Access (APA) and its
 * contributors. See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 * The APA 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 eu.scidipes.toolkits.palibrary.impl.jpa;

import info.digitalpreserve.exceptions.RIException;
import info.digitalpreserve.interfaces.RepInfoCategory;

import java.text.ParseException;
import java.util.Locale;

import javax.persistence.AttributeConverter;
import javax.persistence.Converter;

import org.apache.commons.lang.StringUtils;
import org.springframework.format.Formatter;

import eu.scidipes.common.framework.FrameworkWrapper;
import eu.scidipes.toolkits.palibrary.exceptions.PARuntimeException;

/**
 * Dual use converter between {@link RepInfoCategory} and <code>String</code>. Implements both the JPA
 * {@link AttributeConverter} and Spring {@link Formatter} to avoid duplication of printing and parsing logic.
 * 
 * @author Tom Bunting
 * 
 */
@Converter
public class CategoryConverter implements AttributeConverter<RepInfoCategory, String>, Formatter<RepInfoCategory> {

    @Override
    public String convertToDatabaseColumn(final RepInfoCategory category) {
        return categoryToStringHelper(category);
    }

    @Override
    public RepInfoCategory convertToEntityAttribute(final String categoryName) {
        return stringToCategoryHelper(categoryName);
    }

    @Override
    public String print(final RepInfoCategory category, final Locale locale) {
        return categoryToStringHelper(category);
    }

    @Override
    public RepInfoCategory parse(final String categoryName, final Locale locale) throws ParseException {
        return stringToCategoryHelper(categoryName);
    }

    /**
     * Creates a new {@link RepInfoCategory} from a category name <code>String</code>
     * 
     * @param categoryName
     * @return a new category
     */
    private RepInfoCategory stringToCategoryHelper(final String categoryName) {
        try {
            return StringUtils.isBlank(categoryName) ? null
                    : FrameworkWrapper.getRepInfoCategoryByName(categoryName);

        } catch (final RIException e) {
            throw new PARuntimeException("Exception converting String [" + categoryName + "] into RepInfoCategory",
                    e);
        }
    }

    /**
     * Returns a <code>String</code> representing the name of the passed {@link RepInfoCategory}
     * 
     * @param category
     * @return the category name
     */
    private String categoryToStringHelper(final RepInfoCategory category) {
        return category == null ? "" : category.getName();
    }

}