nl.surfnet.coin.selfservice.service.impl.PersonAttributeLabelServiceJsonImpl.java Source code

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Here is the source code for nl.surfnet.coin.selfservice.service.impl.PersonAttributeLabelServiceJsonImpl.java

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/*
 * Copyright 2012 SURFnet bv, The Netherlands
 *
 * 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 nl.surfnet.coin.selfservice.service.impl;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import nl.surfnet.coin.selfservice.domain.PersonAttributeLabel;
import nl.surfnet.coin.selfservice.service.PersonAttributeLabelService;

import org.apache.commons.io.IOUtils;
import org.codehaus.jackson.JsonNode;
import org.codehaus.jackson.map.ObjectMapper;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;

/**
 * Parses a json file into {@link nl.surfnet.coin.selfservice.domain.PersonAttributeLabel}
 */
public class PersonAttributeLabelServiceJsonImpl implements PersonAttributeLabelService {

    private static final String NAME = "Name";
    private static final String DESCRIPTION = "Description";
    private static final String[] LANGUAGES = { "en", "nl" };

    private Map<String, PersonAttributeLabel> labelMap;

    private String attributeJsonFile;

    public PersonAttributeLabelServiceJsonImpl(String attributeJsonFile) {
        this.attributeJsonFile = attributeJsonFile;
        try {
            populate();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    private void populate() throws IOException {
        Resource jsonResource;
        if (attributeJsonFile.startsWith("classpath:")) {
            jsonResource = new ClassPathResource(attributeJsonFile.substring("classpath:".length()));
        } else {
            jsonResource = new FileSystemResource(attributeJsonFile);
        }
        labelMap = parseStreamToAttributeLabelMap(IOUtils.toString(jsonResource.getInputStream()));
    }

    public Map<String, PersonAttributeLabel> getAttributeLabelMap() {
        return labelMap;
    }

    /**
     * @param src {@link InputStream} of the Json data
     * @return {@link Map}
     */
    Map<String, PersonAttributeLabel> parseStreamToAttributeLabelMap(String src) throws IOException {
        Map<String, PersonAttributeLabel> m = new HashMap<String, PersonAttributeLabel>();
        ObjectMapper mapper = new ObjectMapper();

        JsonNode rootNode = mapper.readValue(src, JsonNode.class);
        final Iterator<Map.Entry<String, JsonNode>> fields = rootNode.getFields();

        while (fields.hasNext()) {
            final Map.Entry<String, JsonNode> labelField = fields.next();
            PersonAttributeLabel a = makeAttributeLabel(labelField);
            m.put(a.getKey(), a);
        }

        return m;
    }

    /**
     * Converts a Map.Entry into an PersonAttributeLabel
     *
     * @param labelField {@link Map.Entry} with the attribute key as key and sub {@link JsonNode}'s as values
     * @return {@link nl.surfnet.coin.selfservice.domain.PersonAttributeLabel}
     */
    private PersonAttributeLabel makeAttributeLabel(Map.Entry<String, JsonNode> labelField) {
        PersonAttributeLabel a = new PersonAttributeLabel();
        a.setKey(labelField.getKey());

        final JsonNode nameAndDesc = labelField.getValue();

        if (nameAndDesc != null) {
            final JsonNode nameNode = nameAndDesc.get(NAME);
            if (nameNode != null) {
                a.setNames(getTranslatedLabels(nameNode));
            }
            final JsonNode descNode = nameAndDesc.get(DESCRIPTION);
            if (descNode != null) {
                a.setDescriptions(getTranslatedLabels(descNode));
            }
        }
        return a;
    }

    /**
     * Name and Description have subnodes for "en", "nl" etc. These are returned as Map with the
     * <pre>{
     * "nl":"Voornaam",
     * "en":"Name"
     * }</pre>
     *
     * @param node {@link JsonNode}
     * @return Map with key-value for language and label
     */
    private Map<String, String> getTranslatedLabels(JsonNode node) {
        Map<String, String> m = new HashMap<String, String>();
        for (String lang : LANGUAGES) {
            if (node.has(lang)) {
                m.put(lang, node.get(lang).getTextValue());
            }
        }
        return m;
    }

    public String getAttributeJsonFile() {
        return attributeJsonFile;
    }

}