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Java SDK for ConfigCat, a feature flag, feature toggle, and configuration management service. That lets you launch new features and change your software configuration remotely without actually (re)deploying code. ConfigCat even helps you do controlled roll-outs like canary releases and blue-green deployments.

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package com.configcat;

import java.util.Map;

/**
 * Describes a data source builder.
 */
public class OverrideDataSourceBuilder {
    private String filePath;
    private boolean isResource;
    private boolean autoReload;
    private Map map;

    private OverrideDataSourceBuilder(String filePath, boolean isResource, boolean autoReload) {
        this.filePath = filePath;
        this.isResource = isResource;
        this.autoReload = autoReload;
    }

    private OverrideDataSourceBuilder(Map map) {
        this.map = map;
    }

    OverrideDataSource build(ConfigCatLogger logger) {
        if (this.map != null) {
            return new LocalMapDataSource(this.map);
        }

        if (this.filePath != null && !this.filePath.isEmpty()) {
            return new LocalFileDataSource(this.filePath, this.isResource, logger, this.autoReload);
        }

        return new OverrideDataSource();
    }

    /**
     * Creates an override data source builder that describes a local file data source.
     *
     * @param filePath   path to the file.
     * @param autoReload when it's true, the file will be reloaded when it gets modified.
     * @return the builder.
     */
    public static OverrideDataSourceBuilder localFile(String filePath, boolean autoReload) {
        return new OverrideDataSourceBuilder(filePath, false, autoReload);
    }

    /**
     * Creates an override data source builder that describes a classpath resource data source.
     *
     * @param resourceName name of the classpath resource.
     * @return the builder.
     */
    public static OverrideDataSourceBuilder classPathResource(String resourceName) {
        return new OverrideDataSourceBuilder(resourceName, true, false);
    }

    /**
     * Creates an override data source builder that describes a map data source.
     *
     * @param map map that contains the overrides.
     * @return the builder.
     */
    public static OverrideDataSourceBuilder map(Map map) {
        return new OverrideDataSourceBuilder(map);
    }
}