Add TimeScale and TimeTicks to allow building linear time charts (#116)

* feat: add TimeScale and TimeTicks to allow building linear time charts
* chore: codestyle

Fixes #90

Author: astappiev

chartjs-java-model/src/main/java/software/xdev/chartjs/model/options/scales/ScaleAdapters.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright © 2023 XDEV Software (https://xdev.software)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package software.xdev.chartjs.model.options.scales;
+
+/**
+ * Options for adapter for external date library if that adapter needs or supports options.
+ */
+public class ScaleAdapters
+{
+	protected Object date;
+	
+	public Object getDate()
+	{
+		return this.date;
+	}
+	
+	public ScaleAdapters setDate(final Object date)
+	{
+		this.date = date;
+		return this;
+	}
+}

chartjs-java-model/src/main/java/software/xdev/chartjs/model/options/scales/Time.java

@@ -77,6 +77,13 @@ public class Time
 	 */
 	protected String unit;
 
+	/**
+	 * Default {@code 'millisecond'}
+	 *
+	 * @see #setMinUnit(String)
+	 */
+	protected String minUnit;
+	
 	/**
 	 * Default {@code 1}
 	 *
@@ -222,6 +229,23 @@ public Time setUnit(final String unit)
 		return this;
 	}
 
+	/**
+	 * @see #setMinUnit(String)
+	 */
+	public String getMinUnit()
+	{
+		return this.minUnit;
+	}
+	
+	/**
+	 * The minimum display format to be used for a time unit.
+	 */
+	public Time setMinUnit(final String minUnit)
+	{
+		this.minUnit = minUnit;
+		return this;
+	}
+	
 	/**
 	 * @see #setUnitStepSize(BigDecimal)
 	 */

chartjs-java-model/src/main/java/software/xdev/chartjs/model/options/scales/TimeScale.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright © 2023 XDEV Software (https://xdev.software)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package software.xdev.chartjs.model.options.scales;
+
+import software.xdev.chartjs.model.options.ticks.TimeTicks;
+
+
+public class TimeScale extends Scale<TimeTicks, TimeScale>
+{
+	/**
+	 * Default {@code "time"}
+	 *
+	 * @see #setType(String type)
+	 */
+	protected String type = "time";
+	
+	protected Time time;
+	
+	protected ScaleAdapters adapters;
+	
+	/**
+	 * @see #setType(String type)
+	 */
+	public String getType()
+	{
+		return this.type;
+	}
+	
+	/**
+	 * As defined in Scales. Could be {@code "time"} or {@code "timeseries"}.
+	 */
+	public TimeScale setType(final String type)
+	{
+		this.type = type;
+		return this;
+	}
+	
+	/**
+	 * @see #setTime(Time)
+	 */
+	public Time getTime()
+	{
+		return time;
+	}
+	
+	/**
+	 * As defined in Time.
+	 */
+	public TimeScale setTime(final Time time)
+	{
+		this.time = time;
+		return this;
+	}
+	
+	/**
+	 * @see #setAdapters(ScaleAdapters)
+	 */
+	public ScaleAdapters getAdapters()
+	{
+		return adapters;
+	}
+	
+	/**
+	 * Options for adapter for external date library if that adapter needs or supports options.
+	 */
+	public TimeScale setAdapters(final ScaleAdapters adapters)
+	{
+		this.adapters = adapters;
+		return this;
+	}
+}

chartjs-java-model/src/main/java/software/xdev/chartjs/model/options/ticks/TimeTicks.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright © 2023 XDEV Software (https://xdev.software)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package software.xdev.chartjs.model.options.ticks;
+
+public class TimeTicks extends Ticks<TimeTicks>
+{
+	/**
+	 * Default {@code "auto"}
+	 *
+	 * @see #setSource(String type)
+	 */
+	protected String source;
+	
+	/**
+	 * @see #setSource(String)
+	 */
+	public String getSource()
+	{
+		return this.source;
+	}
+	
+	/**
+	 * How ticks are generated, possible values are: 'auto' - generates "optimal" ticks based on scale size and time
+	 * options; 'data' - generates ticks from data (including labels from data {x|y} objects); 'labels' - generates
+	 * ticks from user given labels ONLY
+	 */
+	public TimeTicks setSource(final String source)
+	{
+		this.source = source;
+		return this;
+	}
+}