com.google.gapid.widgets.Licenses.java Source code

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Here is the source code for com.google.gapid.widgets.Licenses.java

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/*
 * Copyright (C) 2017 Google Inc.
 *
 * 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.google.gapid.widgets;

import static java.nio.charset.StandardCharsets.UTF_8;
import static java.util.logging.Level.SEVERE;

import com.google.common.io.Resources;
import com.google.gapid.util.Messages;

import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTError;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.browser.LocationAdapter;
import org.eclipse.swt.browser.LocationEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

import java.io.IOException;
import java.util.logging.Logger;

/**
 * Dialog to display the licenses used by the application in an HTML browser window.
 */
public class Licenses {
    private static final Logger LOG = Logger.getLogger(Licenses.class.getName());

    private Licenses() {
    }

    public static void showLicensesDialog(Shell shell) {
        new MessageDialog(shell, Messages.LICENSES, null, Messages.LICENSES, MessageDialog.INFORMATION, 0,
                IDialogConstants.OK_LABEL) {
            @Override
            protected boolean isResizable() {
                return true;
            }

            @Override
            protected Control createCustomArea(Composite parent) {
                Browser browser;
                try {
                    browser = new Browser(parent, SWT.NONE);
                } catch (SWTError e) {
                    // Failed to initialize the browser. Show it as a plain text widget.
                    Text text = new Text(parent,
                            SWT.MULTI | SWT.READ_ONLY | SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
                    text.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
                    text.setText(readLicenses(false));
                    return text;
                }

                GridData data = new GridData(SWT.FILL, SWT.FILL, true, true);
                data.widthHint = 600;
                data.heightHint = 400;
                browser.setLayoutData(data);
                browser.setText(readLicenses(true));
                browser.addLocationListener(new LocationAdapter() {
                    @Override
                    public void changing(LocationEvent event) {
                        if ("about:blank".equals(event.location)) {
                            browser.setText(readLicenses(true));
                        }
                    }
                });
                return browser;
            }
        }.open();
    }

    protected static String readLicenses(boolean html) {
        try {
            String result = Resources.toString(Resources.getResource("text/licenses.html"), UTF_8);
            if (html) {
                // Linkify links.
                result = result.replaceAll("(https?://[^\\s]+(?:[^\\s.,;:!?'\"()\\[\\]{}]))",
                        "<a href='$1'>$1</a>");
            } else {
                // De-HTML the text.
                result = result.replaceAll("<[^>]+>", "");
            }
            return result;
        } catch (IOException | IllegalArgumentException e) {
            LOG.log(SEVERE, "Failed to load the licenses", e);
            return "Failed to load the licenses.";
        }
    }
}