Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2014 IBM Corporation 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: * IBM Corporation - initial API and implementation *******************************************************************************/ package org.eclipse.jdt.internal.debug.ui.jres; import java.io.File; import org.eclipse.core.resources.ResourcesPlugin; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.Status; import org.eclipse.core.runtime.preferences.IEclipsePreferences; import org.eclipse.core.runtime.preferences.InstanceScope; import org.eclipse.debug.internal.ui.SWTFactory; import org.eclipse.jdt.core.IJavaModel; import org.eclipse.jdt.core.JavaCore; import org.eclipse.jdt.debug.ui.IJavaDebugUIConstants; import org.eclipse.jdt.internal.debug.ui.IJavaDebugHelpContextIds; import org.eclipse.jdt.internal.debug.ui.JDIDebugUIPlugin; import org.eclipse.jdt.launching.AbstractVMInstall; import org.eclipse.jdt.launching.IVMInstall; import org.eclipse.jdt.launching.JavaRuntime; import org.eclipse.jdt.launching.LibraryLocation; import org.eclipse.jface.dialogs.ErrorDialog; import org.eclipse.jface.dialogs.IDialogSettings; import org.eclipse.jface.dialogs.IMessageProvider; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.preference.PreferencePage; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.osgi.util.NLS; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.BusyIndicator; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Link; import org.eclipse.ui.IWorkbench; import org.eclipse.ui.IWorkbenchPreferencePage; import org.eclipse.ui.PlatformUI; import org.eclipse.ui.preferences.IWorkbenchPreferenceContainer; /** * The Installed JREs preference page. * * @since 3.0 */ public class JREsPreferencePage extends PreferencePage implements IWorkbenchPreferencePage { /** * ID for the page * * @since 3.5 */ public static final String ID = "org.eclipse.jdt.debug.ui.preferences.VMPreferencePage"; //$NON-NLS-1$ // JRE Block private InstalledJREsBlock fJREBlock; private Link fCompliance; /** * Constructor */ public JREsPreferencePage() { super(JREMessages.JREsPreferencePage_1); } /* (non-Javadoc) * @see org.eclipse.ui.IWorkbenchPreferencePage#init(org.eclipse.ui.IWorkbench) */ public void init(IWorkbench workbench) { } /** * Find & verify the default VM. */ private void initDefaultVM() { IVMInstall realDefault = JavaRuntime.getDefaultVMInstall(); if (realDefault != null) { IVMInstall[] vms = fJREBlock.getJREs(); for (int i = 0; i < vms.length; i++) { IVMInstall fakeVM = vms[i]; if (fakeVM.equals(realDefault)) { verifyDefaultVM(fakeVM); break; } } } } /* (non-Javadoc) * @see org.eclipse.jface.preference.PreferencePage#createContents(org.eclipse.swt.widgets.Composite) */ @Override protected Control createContents(Composite ancestor) { initializeDialogUnits(ancestor); noDefaultButton(); GridLayout layout = new GridLayout(); layout.numColumns = 1; layout.marginHeight = 0; layout.marginWidth = 0; ancestor.setLayout(layout); SWTFactory.createWrapLabel(ancestor, JREMessages.JREsPreferencePage_2, 1, 300); SWTFactory.createVerticalSpacer(ancestor, 1); fJREBlock = new InstalledJREsBlock(); fJREBlock.createControl(ancestor); Control control = fJREBlock.getControl(); GridData data = new GridData(GridData.FILL_BOTH); data.horizontalSpan = 1; control.setLayoutData(data); fJREBlock.restoreColumnSettings(JDIDebugUIPlugin.getDefault().getDialogSettings(), IJavaDebugHelpContextIds.JRE_PREFERENCE_PAGE); fCompliance = new Link(ancestor, SWT.NONE); fCompliance.setText(JREMessages.JREsPreferencePage_14); fCompliance.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); fCompliance.setVisible(false); fCompliance.addSelectionListener(new SelectionListener() { public void widgetDefaultSelected(SelectionEvent e) { } public void widgetSelected(SelectionEvent e) { openCompliancePreferencePage(); } }); PlatformUI.getWorkbench().getHelpSystem().setHelp(ancestor, IJavaDebugHelpContextIds.JRE_PREFERENCE_PAGE); initDefaultVM(); fJREBlock.initializeTimeStamp(); fJREBlock.addSelectionChangedListener(new ISelectionChangedListener() { public void selectionChanged(SelectionChangedEvent event) { IVMInstall install = getCurrentDefaultVM(); if (install == null) { setValid(false); if (fJREBlock.getJREs().length < 1) { setErrorMessage(JREMessages.JREsPreferencePage_3); } else { setErrorMessage(JREMessages.JREsPreferencePage_13); } } else { //if we change the VM make sure the compliance level supports //generated class files String compliance = getCurrentCompilerCompliance(); if (!supportsCurrentCompliance(install, compliance)) { setMessage(NLS.bind(JREMessages.JREsPreferencePage_0, new String[] { compliance }), IMessageProvider.WARNING); fCompliance.setVisible(true); } else { setMessage(null); fCompliance.setVisible(false); } setValid(true); setErrorMessage(null); } } }); applyDialogFont(ancestor); return ancestor; } /* (non-Javadoc) * @see org.eclipse.jface.preference.PreferencePage#isValid() */ @Override public boolean isValid() { String compliance = getCurrentCompilerCompliance(); if (!supportsCurrentCompliance(getCurrentDefaultVM(), compliance)) { setMessage(NLS.bind(JREMessages.JREsPreferencePage_0, new String[] { compliance }), IMessageProvider.WARNING); fCompliance.setVisible(true); } else { setMessage(null); fCompliance.setVisible(false); } return super.isValid(); } /** * Opens the <code>CompliancePreferencePage</code> * @since 3.3 */ private void openCompliancePreferencePage() { String compliancepage = "org.eclipse.jdt.ui.preferences.CompliancePreferencePage"; //$NON-NLS-1$ IWorkbenchPreferenceContainer wpc = (IWorkbenchPreferenceContainer) getContainer(); if (wpc != null) { wpc.openPage(compliancepage, null); } else { SWTFactory.showPreferencePage(compliancepage); } } /** * @return the current compiler compliance level * @since 3.3 */ private String getCurrentCompilerCompliance() { IEclipsePreferences setting = InstanceScope.INSTANCE.getNode(JavaCore.PLUGIN_ID); if (getContainer() instanceof IWorkbenchPreferenceContainer) { IEclipsePreferences wcs = ((IWorkbenchPreferenceContainer) getContainer()).getWorkingCopyManager() .getWorkingCopy(setting); return wcs.get(JavaCore.COMPILER_COMPLIANCE, (String) JavaCore.getDefaultOptions().get(JavaCore.COMPILER_COMPLIANCE)); } return JavaCore.getOption(JavaCore.COMPILER_COMPLIANCE); } /** * Determines if the vm version will run the currently compiled code based on the compiler compliance lvl * @param vm the vm install * @param compliance the current compiler compliance level * @return true if the selected vm will run the current code, false otherwise * @since 3.3 */ private boolean supportsCurrentCompliance(IVMInstall vm, String compliance) { if (vm instanceof AbstractVMInstall) { AbstractVMInstall install = (AbstractVMInstall) vm; String vmver = install.getJavaVersion(); if (vmver == null) { //if we cannot get a version from the VM we must return true, and let the runtime //error sort it out return true; } int val = compliance.compareTo(vmver); return val < 0 || val == 0; } return false; } /* (non-Javadoc) * @see org.eclipse.jface.preference.IPreferencePage#performOk() */ @Override public boolean performOk() { final boolean[] canceled = new boolean[] { false }; BusyIndicator.showWhile(null, new Runnable() { public void run() { IVMInstall defaultVM = getCurrentDefaultVM(); IVMInstall[] vms = fJREBlock.getJREs(); JREsUpdater updater = new JREsUpdater(); if (!updater.updateJRESettings(vms, defaultVM)) { canceled[0] = true; } } }); if (canceled[0]) { return false; } // save column widths IDialogSettings settings = JDIDebugUIPlugin.getDefault().getDialogSettings(); fJREBlock.saveColumnSettings(settings, IJavaDebugHelpContextIds.JRE_PREFERENCE_PAGE); fJREBlock.initializeTimeStamp(); return super.performOk(); } protected IJavaModel getJavaModel() { return JavaCore.create(ResourcesPlugin.getWorkspace().getRoot()); } /** * Verify that the specified VM can be a valid default VM. This amounts to verifying * that all of the VM's library locations exist on the file system. If this fails, * remove the VM from the table and try to set another default. */ private void verifyDefaultVM(IVMInstall vm) { if (vm != null) { // Verify that all of the specified VM's library locations actually exist LibraryLocation[] locations = JavaRuntime.getLibraryLocations(vm); boolean exist = true; for (int i = 0; i < locations.length; i++) { exist = exist && new File(locations[i].getSystemLibraryPath().toOSString()).exists(); } // If all library locations exist, check the corresponding entry in the list, // otherwise remove the VM if (exist) { fJREBlock.setCheckedJRE(vm); } else { fJREBlock.removeJREs(new IVMInstall[] { vm }); IVMInstall def = JavaRuntime.getDefaultVMInstall(); if (def == null) { fJREBlock.setCheckedJRE(null); } else { fJREBlock.setCheckedJRE(def); } ErrorDialog.openError(getControl().getShell(), JREMessages.JREsPreferencePage_1, JREMessages.JREsPreferencePage_10, new Status(IStatus.ERROR, IJavaDebugUIConstants.PLUGIN_ID, IJavaDebugUIConstants.INTERNAL_ERROR, "JRE removed", null)); // //$NON-NLS-1$ return; } } else { fJREBlock.setCheckedJRE(null); } } private IVMInstall getCurrentDefaultVM() { return fJREBlock.getCheckedJRE(); } /* (non-Javadoc) * @see org.eclipse.jface.dialogs.DialogPage#dispose() */ @Override public void dispose() { super.dispose(); fJREBlock.dispose(); } /* * @see org.eclipse.jface.preference.PreferencePage#okToLeave() */ @Override public boolean okToLeave() { if (fJREBlock != null && fJREBlock.hasChangesInDialog()) { String title = JREMessages.JREsPreferencePage_4; String message = JREMessages.JREsPreferencePage_5; String[] buttonLabels = new String[] { JREMessages.JREsPreferencePage_6, JREMessages.JREsPreferencePage_7, JREMessages.JREsPreferencePage_8 }; MessageDialog dialog = new MessageDialog(getShell(), title, null, message, MessageDialog.QUESTION, buttonLabels, 0); int res = dialog.open(); if (res == 0) { // apply return performOk() && super.okToLeave(); } else if (res == 1) { // discard fJREBlock.fillWithWorkspaceJREs(); fJREBlock.restoreColumnSettings(JDIDebugUIPlugin.getDefault().getDialogSettings(), IJavaDebugHelpContextIds.JRE_PREFERENCE_PAGE); initDefaultVM(); fJREBlock.initializeTimeStamp(); } else { // apply later } } return super.okToLeave(); } }