為元件建立Sling模型

package com.aem.customcorecomponent.core.models.impl;
import com.adobe.cq.export.json.ComponentExporter;
import com.adobe.cq.export.json.ExporterConstants;
import com.adobe.cq.forms.core.components.internal.form.ReservedProperties;
import com.adobe.cq.forms.core.components.util.AbstractOptionsFieldImpl;
import com.aem.customcorecomponent.core.models.CountriesDropDown;
import com.day.cq.dam.api.Asset;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceResolver;
import org.apache.sling.models.annotations.Default;
import org.apache.sling.models.annotations.Exporter;
import org.apache.sling.models.annotations.Model;
import org.apache.sling.models.annotations.injectorspecific.InjectionStrategy;
import org.apache.sling.models.annotations.injectorspecific.ValueMapValue;
import org.json.JSONObject;
import javax.annotation.PostConstruct;
import javax.inject.Inject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.*;
import java.util.stream.Collectors;

//@Model(adaptables = SlingHttpServletRequest.class,adapters = CountriesDropDown.class,defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL)

@Model(
        adaptables = { SlingHttpServletRequest.class, Resource.class },
        adapters = { CountriesDropDown.class,
                ComponentExporter.class },
        resourceType = { "corecomponent/components/adaptiveForm/countries" })
@Exporter(name = ExporterConstants.SLING_MODEL_EXPORTER_NAME, extensions = ExporterConstants.SLING_MODEL_EXTENSION)

public class CountriesDropDownImpl extends AbstractOptionsFieldImpl implements CountriesDropDown {
    @ValueMapValue(injectionStrategy = InjectionStrategy.OPTIONAL, name = ReservedProperties.PN_MULTISELECT)
    @Default(booleanValues = false)
    protected boolean multiSelect;

    private static final Logger logger = LoggerFactory.getLogger(CountriesDropDownImpl.class);
    @Inject
    SlingHttpServletRequest request;

    @Inject
    @Default(values = "asia")
    public String continent;
    @Inject
    private ResourceResolver resourceResolver;
    private JSONObject jsonData;
    public String getContinent()
    {
        logger.info("Returning continent");
        return continent;
    }
    @PostConstruct
    public void init() {

        String jsonPath = "/content/dam/corecomponent/" + getContinent() + ".json"; // Update path as needed
        logger.info("Initializing JSON data for continent: {}", getContinent());

        try {
            // Fetch the JSON resource
            Resource jsonResource = resourceResolver.getResource(jsonPath);
            if (jsonResource != null) {
                // Adapt the resource to an Asset
                Asset asset = jsonResource.adaptTo(Asset.class);
                if (asset != null) {
                    // Get the original rendition and parse it as JSON
                    try (InputStream inputStream = asset.getOriginal().adaptTo(InputStream.class);
                         BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8))) {

                        String jsonString = reader.lines().collect(Collectors.joining());
                        jsonData = new JSONObject(jsonString);
                        logger.info("Successfully loaded JSON data for path: {}", jsonPath);
                    }
                } else {
                    logger.warn("Failed to adapt resource to Asset at path: {}", jsonPath);
                }
            } else {
                logger.warn("Resource not found at path: {}", jsonPath);
            }
        } catch (Exception e) {
            logger.error("An error occurred while initializing JSON data for path: {}", jsonPath, e);
        }
    }

    @Override
    public Object[] getEnums() {
        Set<String> keySet = jsonData.keySet();


// Convert the set of keys to a sorted array
        String[] countryCodes = keySet.toArray(new String[0]);
        Arrays.sort(countryCodes);

        logger.debug("Returning sorted country codes: " + countryCodes.length);

        return countryCodes;


    }

    @Override
    public String[] getEnumNames() {
        String[] countries = new String[jsonData.keySet().size()];
        logger.info("Fetching countries - Total number: " + countries.length);

// Populate the array with country names
        int index = 0;
        for (String code : jsonData.keySet()) {
            String country = jsonData.getString(code);
            logger.debug("Retrieved country: " + country);
            countries[index++] = country;
        }

// Sort the array alphabetically
        Arrays.sort(countries);
        logger.debug("Returning " + countries.length + " sorted countries");

        return countries;

    }

    @Override
    public Boolean isMultiSelect() {
        return multiSelect;
    }
}