Java tutorial
/******************************************************************************* * Copyright (C) 2014, 2015 Google Inc and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * Marcus Eng (Google) - initial API and implementation * Sergey Prigogin (Google) *******************************************************************************/ package org.eclipse.ui.internal.monitoring.preferences; import java.util.HashMap; import java.util.Map; import org.eclipse.jface.layout.GridDataFactory; import org.eclipse.jface.layout.GridLayoutFactory; import org.eclipse.jface.layout.LayoutConstants; import org.eclipse.jface.layout.PixelConverter; import org.eclipse.jface.preference.BooleanFieldEditor; import org.eclipse.jface.preference.FieldEditor; import org.eclipse.jface.preference.FieldEditorPreferencePage; import org.eclipse.jface.preference.IPreferenceStore; import org.eclipse.jface.preference.IntegerFieldEditor; import org.eclipse.jface.util.PropertyChangeEvent; import org.eclipse.swt.SWT; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.ui.IWorkbench; import org.eclipse.ui.IWorkbenchPreferencePage; import org.eclipse.ui.internal.monitoring.MonitoringPlugin; import org.eclipse.ui.monitoring.PreferenceConstants; /** * Preference page that allows user to toggle plug in settings from Eclipse preferences. */ public class MonitoringPreferencePage extends FieldEditorPreferencePage implements IWorkbenchPreferencePage { private static final int HOUR_IN_MS = 3600000; private static final IPreferenceStore preferences = MonitoringPlugin.getDefault().getPreferenceStore(); private BooleanFieldEditor monitoringEnabled; private IntegerEditor longEventWarningThreshold; private IntegerEditor longEventErrorThreshold; private IntegerEditor deadlockThreshold; private Map<FieldEditor, Composite> editors; private class IntegerEditor extends IntegerFieldEditor { public IntegerEditor(String name, String labelText, Composite parent, int min, int max) { super(name, labelText, parent); setValidRange(min, max); } @Override protected void valueChanged() { super.valueChanged(); if (longEventWarningThreshold.isValid() && longEventErrorThreshold.checkValue()) { deadlockThreshold.checkValue(); } } @Override protected boolean checkState() { if (!super.checkState()) { return false; } String preferenceName = getPreferenceName(); if (preferenceName.equals(PreferenceConstants.LONG_EVENT_ERROR_THRESHOLD_MILLIS)) { if (longEventWarningThreshold.isValid() && getIntValue() < longEventWarningThreshold.getIntValue()) { showMessage(Messages.MonitoringPreferencePage_error_threshold_too_low_error); return false; } } else if (preferenceName.equals(PreferenceConstants.DEADLOCK_REPORTING_THRESHOLD_MILLIS)) { if (longEventWarningThreshold.isValid() && getIntValue() <= longEventErrorThreshold.getIntValue()) { showMessage(Messages.MonitoringPreferencePage_deadlock_threshold_too_low_error); return false; } } return true; } private boolean checkValue() { boolean oldState = isValid(); refreshValidState(); boolean isValid = isValid(); if (isValid != oldState) { fireStateChanged(IS_VALID, oldState, isValid); } return isValid; } } public MonitoringPreferencePage() { super(GRID); editors = new HashMap<FieldEditor, Composite>(); } @Override public void createFieldEditors() { Composite parent = getFieldEditorParent(); PixelConverter pixelConverter = new PixelConverter(parent); Composite container = new Composite(parent, SWT.NONE); createTopBlock(container); createBottomBlock(container, pixelConverter); GridLayoutFactory.fillDefaults().numColumns(1).spacing(LayoutConstants.getSpacing()) .generateLayout(container); GridLayoutFactory.fillDefaults().numColumns(1).spacing(LayoutConstants.getSpacing()).generateLayout(parent); } private Composite createTopBlock(Composite container) { Composite block = new Composite(container, SWT.NONE); monitoringEnabled = createBooleanEditor(PreferenceConstants.MONITORING_ENABLED, Messages.MonitoringPreferencePage_enable_monitoring_label, block); createBooleanEditor(PreferenceConstants.LOG_TO_ERROR_LOG, Messages.MonitoringPreferencePage_log_freeze_events_label, block); longEventWarningThreshold = createIntegerEditor(PreferenceConstants.LONG_EVENT_WARNING_THRESHOLD_MILLIS, Messages.MonitoringPreferencePage_warning_threshold_label, block, 3, HOUR_IN_MS); longEventErrorThreshold = createIntegerEditor(PreferenceConstants.LONG_EVENT_ERROR_THRESHOLD_MILLIS, Messages.MonitoringPreferencePage_error_threshold_label, block, 3, HOUR_IN_MS); deadlockThreshold = createIntegerEditor(PreferenceConstants.DEADLOCK_REPORTING_THRESHOLD_MILLIS, Messages.MonitoringPreferencePage_deadlock_threshold_label, block, 1000, 24 * HOUR_IN_MS); createIntegerEditor(PreferenceConstants.MAX_STACK_SAMPLES, Messages.MonitoringPreferencePage_max_stack_samples_label, block, 0, 100); GridLayoutFactory.fillDefaults().numColumns(2).spacing(LayoutConstants.getSpacing()).applyTo(block); return block; } private Composite createBottomBlock(Composite container, PixelConverter pixelConverter) { Composite block = new Composite(container, SWT.NONE); createEmptySpace(block, pixelConverter.convertVerticalDLUsToPixels(3), 2); FilterListEditor uiThreadFilter = new FilterListEditor(PreferenceConstants.UI_THREAD_FILTER, Messages.MonitoringPreferencePage_ui_thread_filter_label, Messages.MonitoringPreferencePage_add_ui_thread_filter_button_label, Messages.MonitoringPreferencePage_remove_ui_thread_filter_button_label, Messages.FilterInputDialog_ui_thread_filter_message, block); addField(uiThreadFilter, block); createEmptySpace(block, pixelConverter.convertVerticalDLUsToPixels(3), 2); FilterListEditor noninterestingThreadFilter = new FilterListEditor( PreferenceConstants.NONINTERESTING_THREAD_FILTER, Messages.MonitoringPreferencePage_noninteresting_thread_filter_label, Messages.MonitoringPreferencePage_add_noninteresting_thread_filter_button_label, Messages.MonitoringPreferencePage_remove_noninteresting_thread_filter_button_label, Messages.FilterInputDialog_noninteresting_thread_filter_message, block); addField(noninterestingThreadFilter, block); GridLayoutFactory.fillDefaults().numColumns(2).spacing(LayoutConstants.getSpacing()).applyTo(block); return block; } private static Control createEmptySpace(Composite parent, int height, int span) { Label label = new Label(parent, SWT.LEFT); GridDataFactory.fillDefaults().span(span, 1).hint(0, height).applyTo(label); return label; } @Override public void init(IWorkbench workbench) { setPreferenceStore(preferences); } @Override public void propertyChange(PropertyChangeEvent event) { if (event.getProperty().equals(FieldEditor.VALUE)) { Object source = event.getSource(); if (source instanceof FieldEditor) { String preferenceName = ((FieldEditor) source).getPreferenceName(); if (preferenceName.equals(PreferenceConstants.MONITORING_ENABLED)) { boolean enabled = Boolean.TRUE.equals(event.getNewValue()); enableDependentFields(enabled); } } } super.propertyChange(event); } @Override protected void performDefaults() { super.performDefaults(); enableDependentFields(monitoringEnabled.getBooleanValue()); } private void enableDependentFields(boolean enable) { for (Map.Entry<FieldEditor, Composite> entry : editors.entrySet()) { FieldEditor editor = entry.getKey(); if (!editor.getPreferenceName().equals(PreferenceConstants.MONITORING_ENABLED)) { editor.setEnabled(enable, entry.getValue()); } } } private BooleanFieldEditor createBooleanEditor(String name, String labelText, Composite parent) { BooleanFieldEditor field = new BooleanFieldEditor(name, labelText, parent); return addField(field, parent); } private IntegerEditor createIntegerEditor(String name, String labelText, Composite parent, int min, int max) { IntegerEditor field = new IntegerEditor(name, labelText, parent, min, max); return addField(field, parent); } private <T extends FieldEditor> T addField(T editor, Composite parent) { super.addField(editor); editor.fillIntoGrid(parent, 2); editors.put(editor, parent); if (!editor.getPreferenceName().equals(PreferenceConstants.MONITORING_ENABLED)) { boolean enabled = preferences.getBoolean(PreferenceConstants.MONITORING_ENABLED); editor.setEnabled(enabled, parent); } return editor; } }