Java tutorial
/******************************************************************************* * Copyright (c) 2011, 2013 Wind River Systems, 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: * Wind River Systems - initial API and implementation *******************************************************************************/ package org.eclipse.tcf.te.ui.controls.net; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.net.InetAddress; import java.security.AccessController; import java.security.PrivilegedAction; import org.eclipse.core.runtime.IProgressMonitor; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.Platform; import org.eclipse.core.runtime.Status; import org.eclipse.jface.dialogs.DialogPage; import org.eclipse.jface.dialogs.IDialogPage; import org.eclipse.jface.dialogs.IMessageProvider; import org.eclipse.jface.dialogs.ProgressMonitorDialog; import org.eclipse.jface.operation.IRunnableWithProgress; import org.eclipse.jface.wizard.IWizardContainer; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.VerifyListener; import org.eclipse.swt.widgets.Control; import org.eclipse.tcf.te.ui.controls.BaseEditBrowseTextControl; import org.eclipse.tcf.te.ui.controls.activator.UIPlugin; import org.eclipse.tcf.te.ui.controls.nls.Messages; import org.eclipse.tcf.te.ui.controls.validator.NameOrIPValidator; import org.eclipse.tcf.te.ui.controls.validator.NameOrIPVerifyListener; import org.eclipse.tcf.te.ui.controls.validator.Validator; /** * Basic remote host name or IP-address control. */ public class RemoteHostAddressControl extends BaseEditBrowseTextControl { /** * Constructor. * * @param parentPage The parent dialog page this control is embedded in. Must not be <code>null</code>! */ public RemoteHostAddressControl(IDialogPage parentPage) { super(parentPage); setIsGroup(false); setHasHistory(false); setEditFieldLabel(Messages.RemoteHostAddressControl_label); setButtonLabel(Messages.RemoteHostAddressControl_button_label); } /* (non-Javadoc) * @see org.eclipse.tcf.te.ui.controls.BaseEditBrowseTextControl#onButtonControlSelected() */ @Override protected void onButtonControlSelected() { onCheckAddress(); getButtonControl().setEnabled(false); // Reset the validation message. if (getMessage() != null && getMessage().equals(getUserInformationTextCheckNameAddress())) { setMessage(null, IMessageProvider.NONE); } if (getControlDecoration() != null) { getControlDecoration().hide(); } } /* (non-Javadoc) * @see org.eclipse.tcf.te.ui.controls.BaseEditBrowseTextControl#modifyText(org.eclipse.swt.events.ModifyEvent) */ @Override public void modifyText(ModifyEvent e) { super.modifyText(e); boolean enabled = isValid() && (!(getEditFieldValidator() instanceof NameOrIPValidator) || ((NameOrIPValidator) getEditFieldValidator()).isName()); setButtonControlEnabled(enabled); if (enabled && getControlDecoration() != null) { getControlDecoration().hide(); } } /* (non-Javadoc) * @see org.eclipse.tcf.te.ui.controls.BaseEditBrowseTextControl#setButtonControlEnabled(boolean) */ @Override protected void setButtonControlEnabled(boolean enabled) { boolean btnEnabled = enabled; if (btnEnabled) { // The "Check" button needs specific enablement btnEnabled = isValid() && (!(getEditFieldValidator() instanceof NameOrIPValidator) || ((NameOrIPValidator) getEditFieldValidator()).isName()); } super.setButtonControlEnabled(btnEnabled); } /* (non-Javadoc) * @see org.eclipse.tcf.te.ui.controls.BaseEditBrowseTextControl#doCreateEditFieldValidator() */ @Override protected Validator doCreateEditFieldValidator() { return new NameOrIPValidator(Validator.ATTR_MANDATORY | NameOrIPValidator.ATTR_IP | NameOrIPValidator.ATTR_NAME | NameOrIPValidator.ATTR_CHECK_AVAILABLE); } /* (non-Javadoc) * @see org.eclipse.tcf.te.ui.controls.BaseEditBrowseTextControl#configureEditFieldValidator(org.eclipse.tcf.te.ui.controls.validator.Validator) */ @Override protected void configureEditFieldValidator(Validator validator) { if (validator != null && validator instanceof NameOrIPValidator) { validator.setMessageText(NameOrIPValidator.INFO_MISSING_NAME_OR_IP, Messages.RemoteHostAddressControl_information_missingTargetNameAddress); validator.setMessageText(NameOrIPValidator.ERROR_INVALID_NAME_OR_IP, Messages.RemoteHostAddressControl_error_invalidTargetNameAddress); validator.setMessageText(NameOrIPValidator.ERROR_INVALID_NAME, Messages.RemoteHostAddressControl_error_invalidTargetNameAddress); validator.setMessageText(NameOrIPValidator.ERROR_INVALID_IP, Messages.RemoteHostAddressControl_error_invalidTargetIpAddress); validator.setMessageText(NameOrIPValidator.INFO_CHECK_NAME, getUserInformationTextCheckNameAddress()); } } private VerifyListener verifyListener; /* (non-Javadoc) * @see org.eclipse.tcf.te.ui.controls.BaseEditBrowseTextControl#doGetEditFieldControlVerifyListener() */ @Override protected VerifyListener doGetEditFieldControlVerifyListener() { if (verifyListener == null) { verifyListener = new NameOrIPVerifyListener( NameOrIPVerifyListener.ATTR_IP | NameOrIPVerifyListener.ATTR_NAME); } return verifyListener; } /** * Returns the human readable text to present to the user in case of the edit field control * content should be checked by user action (pressing the check button). * * @return The user information text or an empty string. Must be never <code>null</code>. */ protected String getUserInformationTextCheckNameAddress() { return Messages.RemoteHostAddressControl_information_checkNameAddressUserInformation; } /** * Returns the human readable text to present to the user as task name if checking if or if not * the edit field content can be resolved to an IP-address. * * @return The task name for checking the host name. Must be never <code>null</code>. */ protected String getTaskNameCheckNameAddress() { return Messages.RemoteHostAddressControl_information_checkNameAddressField; } /** * Returns the human readable text to present to the user if the edit field content resolving to * an IP-address succeeded. * * @return The information text. Must be never <code>null</code>. */ protected String getInformationTextCheckNameAddressSuccess() { return Messages.RemoteHostAddressControl_information_checkNameAddressFieldOk; } /** * Returns the human readable text to present to the user if the edit field content resolving to * an IP-address failed. * * @return The error text. Must be never <code>null</code>. */ protected String getErrorTextCheckNameAddressFailed() { return Messages.RemoteHostAddressControl_error_targetNameNotResolveable; } /** * If the user entered a host name, we have to validate that we can really resolve the name * to an IP address. Because this may really take a while, give the user the feedback what * we are actually doing. */ private void onCheckAddress() { ProgressMonitorDialog dialog = new ProgressMonitorDialog(getParentControl().getShell()); try { dialog.run(false, false, new IRunnableWithProgress() { private final String address = getEditFieldControlText(); private final Control control = getEditFieldControl(); private final IDialogPage parentPage = getParentPage(); /* (non-Javadoc) * @see org.eclipse.jface.operation.IRunnableWithProgress#run(org.eclipse.core.runtime.IProgressMonitor) */ @Override public void run(IProgressMonitor monitor) throws InvocationTargetException, InterruptedException { try { monitor.setTaskName(getTaskNameCheckNameAddress()); InetAddress[] addresses = InetAddress.getAllByName(address); if (Platform.inDebugMode() && addresses != null) { StringBuilder message = new StringBuilder(); message.append("RemoteHostAddressControl: Name '"); //$NON-NLS-1$ message.append(address); message.append("' resolves to: "); //$NON-NLS-1$ boolean firstAddress = true; for (InetAddress address : addresses) { if (!firstAddress) message.append(", "); //$NON-NLS-1$ message.append(address.getHostAddress()); firstAddress = false; } IStatus status = new Status(IStatus.WARNING, UIPlugin.getUniqueIdentifier(), message.toString()); UIPlugin.getDefault().getLog().log(status); } setCheckResultMessage(IMessageProvider.INFORMATION, getInformationTextCheckNameAddressSuccess()); } catch (Exception e) { setCheckResultMessage(IMessageProvider.WARNING, getErrorTextCheckNameAddressFailed()); control.setFocus(); } finally { // Trigger the wizard container update IWizardContainer container = null; try { // Try to get the wizard container from the parent page if (parentPage != null) { Class<?>[] paramTypes = new Class[0]; Object[] args = new Object[0]; final Method method = parentPage.getClass().getMethod("getContainer", paramTypes); //$NON-NLS-1$ if (!method.isAccessible()) { AccessController.doPrivileged(new PrivilegedAction<Object>() { @Override public Object run() { method.setAccessible(true); return null; } }); } Object result = method.invoke(parentPage, args); if (result instanceof IWizardContainer) { container = (IWizardContainer) result; } } } catch (Exception e) { // If the object does not have a "getContainer()" method, // or the invocation fails or the access to the method // is denied, we are done here and break the loop container = null; } if (container != null) { container.updateButtons(); container.updateMessage(); } } } }); } catch (Exception e) { } } protected void setCheckResultMessage(int severity, String message) { setMessage(message, severity); if (getParentPage() instanceof DialogPage) { ((DialogPage) getParentPage()).setMessage(message, severity); } } }