Java tutorial
/* * Copyright (C) 2011 The Android Open Source Project * * Licensed 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 com.android.ddmuilib.logcat; import com.android.ddmlib.Log.LogLevel; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.TitleAreaDialog; import org.eclipse.swt.SWT; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Combo; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; import java.util.ArrayList; import java.util.List; import java.util.regex.Pattern; import java.util.regex.PatternSyntaxException; /** * Dialog used to create or edit settings for a logcat filter. */ public final class LogCatFilterSettingsDialog extends TitleAreaDialog { private static final String TITLE = "Logcat Message Filter Settings"; private static final String DEFAULT_MESSAGE = "Filter logcat messages by the source's tag, pid or minimum log level.\n" + "Empty fields will match all messages."; private String mFilterName; private String mTag; private String mText; private String mPid; private String mAppName; private String mLogLevel; private Text mFilterNameText; private Text mTagFilterText; private Text mTextFilterText; private Text mPidFilterText; private Text mAppNameFilterText; private Combo mLogLevelCombo; private Button mOkButton; /** * Construct the filter settings dialog with default values for all fields. * @param parentShell . */ public LogCatFilterSettingsDialog(Shell parentShell) { super(parentShell); setDefaults("", "", "", "", "", LogLevel.VERBOSE); } /** * Set the default values to show when the dialog is opened. * @param filterName name for the filter. * @param tag value for filter by tag * @param text value for filter by text * @param pid value for filter by pid * @param appName value for filter by app name * @param level value for filter by log level */ public void setDefaults(String filterName, String tag, String text, String pid, String appName, LogLevel level) { mFilterName = filterName; mTag = tag; mText = text; mPid = pid; mAppName = appName; mLogLevel = level.getStringValue(); } @Override protected Control createDialogArea(Composite shell) { setTitle(TITLE); setMessage(DEFAULT_MESSAGE); Composite parent = (Composite) super.createDialogArea(shell); Composite c = new Composite(parent, SWT.BORDER); c.setLayout(new GridLayout(2, false)); c.setLayoutData(new GridData(GridData.FILL_BOTH)); createLabel(c, "Filter Name:"); mFilterNameText = new Text(c, SWT.BORDER); mFilterNameText.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); mFilterNameText.setText(mFilterName); createSeparator(c); createLabel(c, "by Log Tag:"); mTagFilterText = new Text(c, SWT.BORDER); mTagFilterText.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); mTagFilterText.setText(mTag); createLabel(c, "by Log Message:"); mTextFilterText = new Text(c, SWT.BORDER); mTextFilterText.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); mTextFilterText.setText(mText); createLabel(c, "by PID:"); mPidFilterText = new Text(c, SWT.BORDER); mPidFilterText.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); mPidFilterText.setText(mPid); createLabel(c, "by Application Name:"); mAppNameFilterText = new Text(c, SWT.BORDER); mAppNameFilterText.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); mAppNameFilterText.setText(mAppName); createLabel(c, "by Log Level:"); mLogLevelCombo = new Combo(c, SWT.READ_ONLY | SWT.DROP_DOWN); mLogLevelCombo.setItems(getLogLevels().toArray(new String[0])); mLogLevelCombo.select(getLogLevels().indexOf(mLogLevel)); /* call validateDialog() whenever user modifies any text field */ ModifyListener m = new ModifyListener() { @Override public void modifyText(ModifyEvent arg0) { DialogStatus status = validateDialog(); mOkButton.setEnabled(status.valid); setErrorMessage(status.message); } }; mFilterNameText.addModifyListener(m); mTagFilterText.addModifyListener(m); mTextFilterText.addModifyListener(m); mPidFilterText.addModifyListener(m); mAppNameFilterText.addModifyListener(m); return c; } @Override protected void createButtonsForButtonBar(Composite parent) { super.createButtonsForButtonBar(parent); mOkButton = getButton(IDialogConstants.OK_ID); DialogStatus status = validateDialog(); mOkButton.setEnabled(status.valid); } /** * A tuple that specifies whether the current state of the inputs * on the dialog is valid or not. If it is not valid, the message * field stores the reason why it isn't. */ private static final class DialogStatus { final boolean valid; final String message; private DialogStatus(boolean isValid, String errMessage) { valid = isValid; message = errMessage; } } private DialogStatus validateDialog() { /* check that there is some name for the filter */ if (mFilterNameText.getText().trim().equals("")) { return new DialogStatus(false, "Please provide a name for this filter."); } /* if a pid is provided, it should be a +ve integer */ String pidText = mPidFilterText.getText().trim(); if (pidText.trim().length() > 0) { int pid = 0; try { pid = Integer.parseInt(pidText); } catch (NumberFormatException e) { return new DialogStatus(false, "PID should be a positive integer."); } if (pid < 0) { return new DialogStatus(false, "PID should be a positive integer."); } } /* tag field must use a valid regex pattern */ String tagText = mTagFilterText.getText().trim(); if (tagText.trim().length() > 0) { try { Pattern.compile(tagText); } catch (PatternSyntaxException e) { return new DialogStatus(false, "Invalid regex used in tag field: " + e.getMessage()); } } /* text field must use a valid regex pattern */ String messageText = mTextFilterText.getText().trim(); if (messageText.trim().length() > 0) { try { Pattern.compile(messageText); } catch (PatternSyntaxException e) { return new DialogStatus(false, "Invalid regex used in text field: " + e.getMessage()); } } /* app name field must use a valid regex pattern */ String appNameText = mAppNameFilterText.getText().trim(); if (appNameText.trim().length() > 0) { try { Pattern.compile(appNameText); } catch (PatternSyntaxException e) { return new DialogStatus(false, "Invalid regex used in application name field: " + e.getMessage()); } } return new DialogStatus(true, null); } private void createSeparator(Composite c) { Label l = new Label(c, SWT.SEPARATOR | SWT.HORIZONTAL); GridData gd = new GridData(GridData.FILL_HORIZONTAL); gd.horizontalSpan = 2; l.setLayoutData(gd); } private void createLabel(Composite c, String text) { Label l = new Label(c, SWT.NONE); l.setText(text); GridData gd = new GridData(); gd.horizontalAlignment = SWT.RIGHT; l.setLayoutData(gd); } @Override protected void okPressed() { /* save values from the widgets before the shell is closed. */ mFilterName = mFilterNameText.getText(); mTag = mTagFilterText.getText(); mText = mTextFilterText.getText(); mLogLevel = mLogLevelCombo.getText(); mPid = mPidFilterText.getText(); mAppName = mAppNameFilterText.getText(); super.okPressed(); } /** * Obtain the name for this filter. * @return user provided filter name, maybe empty. */ public String getFilterName() { return mFilterName; } /** * Obtain the tag regex to filter by. * @return user provided tag regex, maybe empty. */ public String getTag() { return mTag; } /** * Obtain the text regex to filter by. * @return user provided tag regex, maybe empty. */ public String getText() { return mText; } /** * Obtain user provided PID to filter by. * @return user provided pid, maybe empty. */ public String getPid() { return mPid; } /** * Obtain user provided application name to filter by. * @return user provided app name regex, maybe empty */ public String getAppName() { return mAppName; } /** * Obtain log level to filter by. * @return log level string. */ public String getLogLevel() { return mLogLevel; } /** * Obtain the string representation of all supported log levels. * @return an array of strings, each representing a certain log level. */ public static List<String> getLogLevels() { List<String> logLevels = new ArrayList<String>(); for (LogLevel l : LogLevel.values()) { logLevels.add(l.getStringValue()); } return logLevels; } }