Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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 org.apache.qpid.disttest.charting.chartbuilder; import java.awt.Color; import java.awt.GradientPaint; import org.apache.qpid.disttest.charting.definition.ChartingDefinition; import org.apache.qpid.disttest.charting.seriesbuilder.DatasetHolder; import org.apache.qpid.disttest.charting.seriesbuilder.SeriesBuilder; import org.jfree.chart.ChartFactory; import org.jfree.chart.JFreeChart; import org.jfree.chart.axis.ValueAxis; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.plot.XYPlot; import org.jfree.chart.title.ShortTextTitle; import org.jfree.data.general.Dataset; public abstract class BaseChartBuilder implements ChartBuilder { static final GradientPaint BLUE_GRADIENT = new GradientPaint(0, 0, Color.white, 0, 1000, Color.blue); private SeriesPainter _seriesPainter = new SeriesPainter(); private final SeriesBuilder _seriesBuilder; protected BaseChartBuilder(SeriesBuilder seriesBuilder) { _seriesBuilder = seriesBuilder; } @Override public JFreeChart buildChart(ChartingDefinition chartingDefinition) { _seriesBuilder.setDatasetHolder(newDatasetHolder()); Dataset dataset = _seriesBuilder.build(chartingDefinition.getSeriesDefinitions()); JFreeChart chart = createChart(chartingDefinition, dataset); return chart; } /** * return a holder of an empty dataset suitable for use with the chart type * returned by {@link #createChartImpl(String, String, String, Dataset, PlotOrientation, boolean, boolean, boolean)}. */ protected abstract DatasetHolder newDatasetHolder(); /** * Create a chart with the supplied parameters. * * For ease of implementation, the signature is intentionally similar * to {@link ChartFactory}'s factory methods. */ protected abstract JFreeChart createChartImpl(String title, String xAxisTitle, String yAxisTitle, final Dataset dataset, PlotOrientation plotOrientation, boolean showLegend, boolean showToolTips, boolean showUrls); /** * Create a {@link SeriesStrokeAndPaintApplier} that will be used to format a chart */ protected abstract SeriesStrokeAndPaintApplier newStrokeAndPaintApplier(); private JFreeChart createChart(ChartingDefinition chartingDefinition, final Dataset dataset) { String title = chartingDefinition.getChartTitle(); String xAxisTitle = chartingDefinition.getXAxisTitle(); String yAxisTitle = chartingDefinition.getYAxisTitle(); final JFreeChart chart = createChartImpl(title, xAxisTitle, yAxisTitle, dataset, PLOT_ORIENTATION, SHOW_LEGEND, SHOW_TOOL_TIPS, SHOW_URLS); configureYAxisBounds(chartingDefinition, chart); addSubtitle(chart, chartingDefinition); chart.setBackgroundPaint(BLUE_GRADIENT); _seriesPainter.applySeriesAppearance(chart, chartingDefinition.getSeriesDefinitions(), newStrokeAndPaintApplier()); return chart; } private void addSubtitle(JFreeChart chart, ChartingDefinition chartingDefinition) { if (chartingDefinition.getChartSubtitle() != null) { chart.addSubtitle(new ShortTextTitle(chartingDefinition.getChartSubtitle())); } } private void configureYAxisBounds(final ChartingDefinition chartingDefinition, final JFreeChart chart) { if (chart.getPlot() != null && chart.getPlot() instanceof XYPlot) { ValueAxis rangeAxis = chart.getXYPlot().getRangeAxis(); if (chartingDefinition.getYAxisLowerBound() != null) { rangeAxis.setLowerBound(chartingDefinition.getYAxisLowerBound()); } if (chartingDefinition.getYAxisUpperBound() != null) { rangeAxis.setUpperBound(chartingDefinition.getYAxisUpperBound()); } } } void setSeriesPainter(SeriesPainter seriesPainter) { _seriesPainter = seriesPainter; } }