| /******************************************************************************* |
| * Copyright (c) 2016 EfficiOS Inc., Jonathan Rajotte-Julien |
| * |
| * All rights reserved. This program and the accompanying materials are |
| * made available under the terms of the Eclipse Public License 2.0 which |
| * accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| *******************************************************************************/ |
| |
| package org.eclipse.tracecompass.internal.tmf.chart.ui.format; |
| |
| import static org.eclipse.tracecompass.common.core.NonNullUtils.checkNotNull; |
| |
| import java.text.FieldPosition; |
| |
| import org.eclipse.jdt.annotation.Nullable; |
| import org.eclipse.tracecompass.common.core.format.DecimalUnitFormat; |
| import org.eclipse.tracecompass.internal.tmf.chart.ui.data.ChartRangeMap; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| |
| /** |
| * Decimal formatter for graph |
| * |
| * Since the graph use normalized internal value the initial (external) |
| * representation needs to be obtained. Subsequent formatting is done based on a |
| * Double. Loss of precision could occurs based on the size. For now, loss of |
| * precision for decimal values is not a big concern. If it ever become one the |
| * use of Long while formatting might come in handy. |
| * |
| * TODO: See if this formatter is specific to the swtchart charts that are |
| * implemented in this plugin or if they can be re-used in another other |
| * charting scheme. We'll probably know when we actually have another |
| * implementation. If swtchart specific, the name of the class and package |
| * should make it clear. |
| * |
| * @author Jonathan Rajotte-Julien |
| * @author Gabriel-Andrew Pollo-Guilbert |
| */ |
| public class ChartDecimalUnitFormat extends DecimalUnitFormat { |
| |
| // ------------------------------------------------------------------------ |
| // Constants |
| // ------------------------------------------------------------------------ |
| |
| private static final long serialVersionUID = -4288059349658845257L; |
| |
| // ------------------------------------------------------------------------ |
| // Members |
| // ------------------------------------------------------------------------ |
| |
| private final @Nullable ChartRangeMap fRangeMap; |
| |
| // ------------------------------------------------------------------------ |
| // Constructors |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Constructor with a range map supplied. |
| * |
| * @param map |
| * A chart range map for mapping values |
| */ |
| public ChartDecimalUnitFormat(@Nullable ChartRangeMap map) { |
| super(); |
| fRangeMap = map; |
| } |
| |
| /** |
| * Constructor with a multiplication factor and range map. |
| * |
| * @param factor |
| * A multiplication factor to apply to the value |
| * @param map |
| * A chart range map for mapping values |
| */ |
| public ChartDecimalUnitFormat(double factor, @Nullable ChartRangeMap map) { |
| super(factor); |
| fRangeMap = map; |
| } |
| |
| /** |
| * Get the range map for this formatter |
| * |
| * @return The range map |
| */ |
| @VisibleForTesting |
| public @Nullable ChartRangeMap getRangeMap() { |
| return fRangeMap; |
| } |
| |
| // ------------------------------------------------------------------------ |
| // Operations |
| // ------------------------------------------------------------------------ |
| |
| @Override |
| public StringBuffer format(@Nullable Object obj, @Nullable StringBuffer toAppendTo, @Nullable FieldPosition pos) { |
| if (!(obj instanceof Number) || toAppendTo == null) { |
| throw new IllegalArgumentException("Cannot format given Object as a Number: " + obj); //$NON-NLS-1$ |
| } |
| |
| Number number = (Number) obj; |
| |
| /* If no map was provided, format with the number unchanged */ |
| ChartRangeMap rangeMap = fRangeMap; |
| if (rangeMap == null) { |
| StringBuffer buffer = super.format(number, toAppendTo, pos); |
| return (buffer == null ? new StringBuffer() : buffer); |
| } |
| |
| /* Find external value before formatting */ |
| Double externalValue = checkNotNull(fRangeMap).getExternalValue(number).doubleValue(); |
| StringBuffer buffer = super.format(externalValue, toAppendTo, pos); |
| return (buffer == null ? new StringBuffer() : buffer); |
| } |
| |
| } |