feat: add options builder (#304)

src/main/java/io/socket/client/IO.java

@@ -104,5 +104,21 @@ public class IO {
          * Whether to enable multiplexing. Default is true.
          */
         public boolean multiplex = true;
+
+        /**
+         * <p>
+         *   Retrieve new builder class that helps creating socket option as builder pattern.
+         *   This method returns exactly same result as :
+         * </p>
+         * <code>
+         * SocketOptionBuilder builder = SocketOptionBuilder.builder();
+         * </code>
+         *
+         * @return builder class that helps creating socket option as builder pattern.
+         * @see SocketOptionBuilder#builder()
+         */
+        public static SocketOptionBuilder builder() {
+            return SocketOptionBuilder.builder();
+        }
     }
 }

src/main/java/io/socket/client/SocketOptionBuilder.java

@@ -0,0 +1,196 @@
+package io.socket.client;
+
+import java.util.List;
+import java.util.Map;
+
+
+/**
+ * Convenient builder class that helps creating
+ * {@link io.socket.client.IO.Options Client Option} object as builder pattern.
+ * Finally, you can get option object with call {@link #build()} method.
+ *
+ * @author junbong
+ */
+public class SocketOptionBuilder {
+    /**
+     * Construct new builder with default preferences.
+     *
+     * @return new builder object
+     * @see SocketOptionBuilder#builder(IO.Options)
+     */
+    public static SocketOptionBuilder builder() {
+        return new SocketOptionBuilder();
+    }
+
+
+    /**
+     * Construct this builder from specified option object.
+     * The option that returned from {@link #build()} method
+     * is not equals with given option.
+     * In other words, builder creates new option object
+     * and copy all preferences from given option.
+     *
+     * @param options option object which to copy preferences
+     * @return new builder object
+     */
+    public static SocketOptionBuilder builder(IO.Options options) {
+        return new SocketOptionBuilder(options);
+    }
+
+
+    private final IO.Options options = new IO.Options();
+
+
+    /**
+     * Construct new builder with default preferences.
+     */
+    protected SocketOptionBuilder() {
+        this(null);
+    }
+
+
+    /**
+     * Construct this builder from specified option object.
+     * The option that returned from {@link #build()} method
+     * is not equals with given option.
+     * In other words, builder creates new option object
+     * and copy all preferences from given option.
+     *
+     * @param options option object which to copy preferences. Null-ok.
+     */
+    protected SocketOptionBuilder(IO.Options options) {
+        if (options != null) {
+            this.setForceNew(options.forceNew)
+                .setMultiplex(options.multiplex)
+                .setReconnection(options.reconnection)
+                .setReconnectionAttempts(options.reconnectionAttempts)
+                .setReconnectionDelay(options.reconnectionDelay)
+                .setReconnectionDelayMax(options.reconnectionDelayMax)
+                .setRandomizationFactor(options.randomizationFactor)
+                .setTimeout(options.timeout)
+                .setTransports(options.transports)
+                .setUpgrade(options.upgrade)
+                .setRememberUpgrade(options.rememberUpgrade)
+                .setHost(options.host)
+                .setHostname(options.hostname)
+                .setPort(options.port)
+                .setPolicyPort(options.policyPort)
+                .setSecure(options.secure)
+                .setPath(options.path)
+                .setQuery(options.query)
+                .setAuth(options.auth)
+                .setExtraHeaders(options.extraHeaders);
+        }
+    }
+
+    public SocketOptionBuilder setForceNew(boolean forceNew) {
+        this.options.forceNew = forceNew;
+        return this;
+    }
+
+    public SocketOptionBuilder setMultiplex(boolean multiplex) {
+        this.options.multiplex = multiplex;
+        return this;
+    }
+
+    public SocketOptionBuilder setReconnection(boolean reconnection) {
+        this.options.reconnection = reconnection;
+        return this;
+    }
+
+    public SocketOptionBuilder setReconnectionAttempts(int reconnectionAttempts) {
+        this.options.reconnectionAttempts = reconnectionAttempts;
+        return this;
+    }
+
+    public SocketOptionBuilder setReconnectionDelay(long reconnectionDelay) {
+        this.options.reconnectionDelay = reconnectionDelay;
+        return this;
+    }
+
+    public SocketOptionBuilder setReconnectionDelayMax(long reconnectionDelayMax) {
+        this.options.reconnectionDelayMax = reconnectionDelayMax;
+        return this;
+    }
+
+
+    public SocketOptionBuilder setRandomizationFactor(double randomizationFactor) {
+        this.options.randomizationFactor = randomizationFactor;
+        return this;
+    }
+
+    public SocketOptionBuilder setTimeout(long timeout) {
+        this.options.timeout = timeout;
+        return this;
+    }
+
+    public SocketOptionBuilder setTransports(String[] transports) {
+        this.options.transports = transports;
+        return this;
+    }
+
+    public SocketOptionBuilder setUpgrade(boolean upgrade) {
+        this.options.upgrade = upgrade;
+        return this;
+    }
+
+    public SocketOptionBuilder setRememberUpgrade(boolean rememberUpgrade) {
+        this.options.rememberUpgrade = rememberUpgrade;
+        return this;
+    }
+
+    public SocketOptionBuilder setHost(String host) {
+        this.options.host = host;
+        return this;
+    }
+
+    public SocketOptionBuilder setHostname(String hostname) {
+        this.options.hostname = hostname;
+        return this;
+    }
+
+    public SocketOptionBuilder setPort(int port) {
+        this.options.port = port;
+        return this;
+    }
+
+    public SocketOptionBuilder setPolicyPort(int policyPort) {
+        this.options.policyPort = policyPort;
+        return this;
+    }
+
+    public SocketOptionBuilder setQuery(String query) {
+        this.options.query = query;
+        return this;
+    }
+
+    public SocketOptionBuilder setSecure(boolean secure) {
+        this.options.secure = secure;
+        return this;
+    }
+
+    public SocketOptionBuilder setPath(String path) {
+        this.options.path = path;
+        return this;
+    }
+
+    public SocketOptionBuilder setAuth(Map<String, String> auth) {
+        this.options.auth = auth;
+        return this;
+    }
+
+    public SocketOptionBuilder setExtraHeaders(Map<String, List<String>> extraHeaders) {
+        this.options.extraHeaders = extraHeaders;
+        return this;
+    }
+
+    /**
+     * Finally retrieve {@link io.socket.client.IO.Options} object
+     * from this builder.
+     *
+     * @return option that built from this builder
+     */
+    public IO.Options build() {
+        return this.options;
+    }
+}