3 files changed, 69 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/commands/CommandTemplate.java b/src/org/traccar/protocol/commands/CommandTemplate.java
new file mode 100644
index 000000000..5d461b276
--- /dev/null
+++ b/src/org/traccar/protocol/commands/CommandTemplate.java
@@ -0,0 +1,8 @@
+package org.traccar.protocol.commands;
+
+import org.traccar.database.ActiveDevice;
+import org.traccar.http.commands.GpsCommand;
+
+public interface CommandTemplate<T extends GpsCommand> {
+    Object applyTo(ActiveDevice activeDevice, T command);
+}
diff --git a/src/org/traccar/protocol/commands/CommandValueConversion.java b/src/org/traccar/protocol/commands/CommandValueConversion.java
new file mode 100644
index 000000000..cfbf3ce5a
--- /dev/null
+++ b/src/org/traccar/protocol/commands/CommandValueConversion.java
@@ -0,0 +1,5 @@
+package org.traccar.protocol.commands;
+
+public interface CommandValueConversion<T> {
+    public String convert(T value);
+}
diff --git a/src/org/traccar/protocol/commands/StringCommandTemplate.java b/src/org/traccar/protocol/commands/StringCommandTemplate.java
new file mode 100644
index 000000000..2ac0ce9a8
--- /dev/null
+++ b/src/org/traccar/protocol/commands/StringCommandTemplate.java
@@ -0,0 +1,56 @@
+package org.traccar.protocol.commands;
+
+import org.traccar.database.ActiveDevice;
+import org.traccar.http.commands.GpsCommand;
+import org.traccar.protocol.commands.CommandValueConversion;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class StringCommandTemplate<T extends GpsCommand> implements CommandTemplate<T> {
+
+    private String messageTemplate;
+    private Map<Class<?>, CommandValueConversion> converters = new HashMap<Class<?>, CommandValueConversion>();
+
+    public StringCommandTemplate(String template, Object... replacements) {
+        this.messageTemplate = String.format(template, replacements);
+    }
+
+    @Override
+    public Object applyTo(ActiveDevice activeDevice, T command) {
+        String currentMessage = messageTemplate;
+        currentMessage = this.replace(currentMessage, GpsCommand.UNIQUE_ID, activeDevice.getUniqueId());
+
+        Map<String, Object> replacements = command.getReplacements();
+
+        for (Map.Entry<String, Object> entry : replacements.entrySet()) {
+            currentMessage = this.replace(currentMessage, entry.getKey(), entry.getValue());
+        }
+
+        return currentMessage;
+    }
+
+    public CommandTemplate addConverter(Class<?> type, CommandValueConversion converter) {
+        converters.put(type, converter);
+        return this;
+    }
+
+    protected CommandValueConversion getConverter(Class<?> type) {
+        return converters.containsKey(type) ? converters.get(type) : idConverter();
+    }
+
+    private CommandValueConversion idConverter() {
+        return new CommandValueConversion() {
+            @Override
+            public String convert(Object value) {
+                return value.toString();
+            }
+        };
+    }
+
+    private String replace(String currentMessage, String key, Object value) {
+        String replacementValue = getConverter(value.getClass()).convert(value);
+        return currentMessage.replace("[" + key + "]", replacementValue);
+    }
+
+}