Utils.java

package eu.ehri.project.indexing.converter.impl;

import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.jayway.jsonpath.JsonPath;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Map;
import java.util.Properties;


class Utils {

    private static final Splitter splitter = Splitter.on(",");

    public static Map<String, List<JsonPath>> loadPaths() {
        Properties pathProperties = loadProperties("paths.properties");
        ImmutableMap.Builder<String, List<JsonPath>> builder = ImmutableMap.builder();
        for (String pathKey : pathProperties.stringPropertyNames()) {
            // NB: Paths given in the properties file do not include the
            // leading '$.' JsonPath expects, so we add that.
            String commaSepPaths = pathProperties.getProperty(pathKey);
            Iterable<String> paths = splitter.split(commaSepPaths);
            List<JsonPath> compiledPaths = Lists.newArrayList();
            for (String path : paths) {
                compiledPaths.add(JsonPath.compile("$." + path));
            }
            builder.put(pathKey, compiledPaths);
        }
        return builder.build();
    }

    public static Map<String, List<String>> loadTypeKeys() {
        Properties typeProperties = loadProperties("types.properties");
        ImmutableMap.Builder<String, List<String>> builder = ImmutableMap.builder();
        for (String typeKey : typeProperties.stringPropertyNames()) {
            String commaSepKeys = typeProperties.getProperty(typeKey);
            Iterable<String> keys = splitter.split(commaSepKeys);
            builder.put(typeKey, Lists.newArrayList(keys));
        }
        return builder.build();
    }

    public static Map<String, List<String>> loadDefaultKeys() {
        Properties typeProperties = loadProperties("defaults.properties");
        ImmutableMap.Builder<String, List<String>> builder = ImmutableMap.builder();
        for (String typeKey : typeProperties.stringPropertyNames()) {
            String commaSepKeys = typeProperties.getProperty(typeKey);
            Iterable<String> keys = splitter.split(commaSepKeys);
            builder.put(typeKey, Lists.newArrayList(keys));
        }
        return builder.build();
    }

    private static Properties loadProperties(String resourceName) {
        Properties properties = new Properties();
        InputStream pathIs = Utils.class.getClassLoader().getResourceAsStream(resourceName);
        if (pathIs == null)
            throw new RuntimeException("Cannot load resource: " + resourceName);
        try {
            properties.load(pathIs);
        } catch (IOException e) {
            throw new RuntimeException("Invalid properties file: " + resourceName, e);
        }
        return properties;
    }
}