com.quotemedia.streamer.client.cfg.ConfigJson Maven / Gradle / Ivy

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Java streaming client that provides easy-to-use client APIs to connect and subscribe to QuoteMedia's market data streaming services. https://quotemedia.com/

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package com.quotemedia.streamer.client.cfg;

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.quotemedia.streamer.client.auth.cfg.AuthCfg;
import com.quotemedia.streamer.client.auth.cfg.AuthCfgJson;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

/**
 * Supports {@link com.quotemedia.streamer.client.StreamFactory} configuration loading form a JSON file.
 */
public final class ConfigJson {
    private static final Logger log = LoggerFactory.getLogger(ConfigJson.class);

    @JsonIgnore
    private String file;

    /**
     * Sets the configuration file path.
     *
     * @param value the file path
     * @return a reference to this object
     */
    public final ConfigJson file(final String value) {
        this.file = value;
        return this;
    }

    /**
     * Loads configuration from file.
     * 
     * First the filesystem is searched, then the classpath.
     * If the file cannot be found in filesystem nor classpath an exception is thrown.
     *
     * @return the loaded configuration
     * @throws IOException if the configuration cannot be loaded from file
     */
    public final Config build() throws IOException {
        InputStream is = null;
        final File f = new File(this.file);

        try {
            if (f.exists() && f.isFile()) {
                is =  new FileInputStream(f);
                log.debug("Loading config from file '{}'.", f.getAbsolutePath());
            } else {
                is = ConfigJson.class.getResourceAsStream(this.file);
                if (is != null) {
                    log.debug("Loading config from classpath '{}'.", this.file);
                }
            }
            if (is == null) {
                throw new FileNotFoundException(String.format("Config file '%s' not found.", this.file));
            }
            final ObjectMapper json = new ObjectMapper();
            json.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
            return json.readValue(is, ConfigImplJson.class);
        } finally {
            if (is != null) {
                is.close();
            }
        }
    }

    private static final class ConfigImplJson implements Config {
        @JsonProperty
        private AuthCfgJson auth;

        @Override
        public AuthCfg auth() {
            return this.auth;
        }
    }
}