com.d3x.morpheus.viz.chart.ChartShape Maven / Gradle / Ivy
/*
* Copyright (C) 2014-2018 D3X Systems - All Rights Reserved
*
* 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 com.d3x.morpheus.viz.chart;
import java.util.HashMap;
import java.util.Map;
/**
* An enum that defines various shapes that can be used to represent points on a chart
*
* @author Xavier Witdouck
*
* This is open source software released under the Apache 2.0 License
*/
public enum ChartShape {
CIRCLE,
SQUARE,
DIAMOND,
TRIANGLE_UP,
TRIANGLE_DOWN,
TRIANGLE_RIGHT,
TRIANGLE_LEFT;
/**
* An interface to an entity that provides shapes for different keys
*/
public interface Provider {
/**
* Returns a shape for the key specified
* @param key the arbitrary key
* @return the shape
*/
ChartShape getShape(Object key);
}
/**
* The default shape provider
*/
public static class DefaultProvider implements Provider {
private volatile int index = -1;
private ChartShape[] shapes = ChartShape.values();
private Map shapeMap = new HashMap<>();
@Override
public ChartShape getShape(Object key) {
ChartShape shape = shapeMap.get(key);
if (shape == null) {
shape = next();
shapeMap.put(key, shape);
}
return shape;
}
/**
* Returns the next shape in line
* @return the next shape
*/
private ChartShape next() {
this.index++;
if (index < shapes.length) {
return shapes[index];
} else {
this.index = 0;
return shapes[index];
}
}
}
}