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/*******************************************************************************
* Copyright (c) 2007, 2016 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.ui.internal.intro.universal.contentdetect;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import org.eclipse.core.runtime.Platform;
import org.eclipse.osgi.service.datalocation.Location;
import org.eclipse.ui.IMemento;
import org.eclipse.ui.XMLMemento;
public class ContentDetectHelper {
public static final int NO_STATE = -1;
private static final String EXTENSION_COUNT_XML = "extensionCount.xml"; //$NON-NLS-1$
private static final String EXTENSION_NAMES_XML = "extensionNames.xml"; //$NON-NLS-1$
private static final String INTROCOUNT = "introcount"; //$NON-NLS-1$
private static final String CONTRIBUTOR = "contributor"; //$NON-NLS-1$
private static final String NAME = "name"; //$NON-NLS-1$
private static final String ROOT = "root"; //$NON-NLS-1$
private static final String PLUGIN_ID = "org.eclipse.ui.intro.universal"; //$NON-NLS-1$
private File configurationDirectory;
private File getConfigurationLocation() {
if (configurationDirectory == null) {
Location location = Platform.getConfigurationLocation();
if (location != null) {
URL configURL = location.getURL();
if (configURL != null && configURL.getProtocol().startsWith("file")) { //$NON-NLS-1$
configurationDirectory = new File(configURL.getFile(), PLUGIN_ID);
if (configurationDirectory != null && !configurationDirectory.exists()) {
configurationDirectory.mkdirs();
}
}
}
}
return configurationDirectory;
}
public void saveExtensionCount(int count) {
XMLMemento writeMemento = XMLMemento.createWriteRoot(ROOT);
writeMemento.putInteger(INTROCOUNT, count);
saveMemento(writeMemento, EXTENSION_COUNT_XML);
}
public int getExtensionCount() {
XMLMemento readMemento = getReadMemento(EXTENSION_COUNT_XML);
if (readMemento == null) {
return NO_STATE;
}
Integer extensionCount = readMemento.getInteger(INTROCOUNT);
if (extensionCount == null) {
return NO_STATE;
}
return extensionCount.intValue();
}
public void saveContributors(Set<String> contributors) {
XMLMemento writeMemento = XMLMemento.createWriteRoot(ROOT);
for (Iterator<String> iter = contributors.iterator(); iter.hasNext();) {
IMemento childMemento = writeMemento.createChild(CONTRIBUTOR);
childMemento.putString(NAME, iter.next());
}
saveMemento(writeMemento, EXTENSION_NAMES_XML);
}
public Set<String> getContributors() {
Set<String> contributors = new HashSet<>();
XMLMemento readMemento = getReadMemento(EXTENSION_NAMES_XML);
if (readMemento == null) {
return contributors;
}
IMemento[] children = readMemento.getChildren(CONTRIBUTOR);
for (int c = 0; c < children.length; c++ ) {
contributors.add(children[c].getString(NAME));
}
return contributors;
}
private XMLMemento getReadMemento(String filename) {
XMLMemento memento;
InputStreamReader reader = null;
try {
final File stateFile = getStateFile(filename);
FileInputStream input = new FileInputStream(stateFile);
reader = new InputStreamReader(input, StandardCharsets.UTF_8);
memento = XMLMemento.createReadRoot(reader);
} catch (FileNotFoundException e) {
memento = null;
// Do nothing, the file will not exist the first time the workbench in used.
} catch (Exception e) {
// TODO should we log an error?
memento = null;
} finally {
try {
if (reader != null)
reader.close();
} catch (IOException e) {
// TODO should we log an error?
}
}
return memento;
}
private void saveMemento(XMLMemento memento, String filename) {
// Save the IMemento to a file.
File stateFile = getStateFile(filename);
OutputStreamWriter writer = null;
try {
FileOutputStream stream = new FileOutputStream(stateFile);
writer = new OutputStreamWriter(stream, StandardCharsets.UTF_8);
memento.save(writer);
} catch (IOException e) {
stateFile.delete();
} finally {
try {
if (writer != null)
writer.close();
} catch (IOException e) {
}
}
}
private File getStateFile(String filename) {
if (getConfigurationLocation() == null) {
return null;
}
File stateFile = new File(getConfigurationLocation(), filename);
return stateFile;
}
public Set<String> findNewContributors(Set<String> contributors, Set<String> previousContributors) {
Set<String> result = new HashSet<>(contributors);
for (Iterator<String> iter = previousContributors.iterator(); iter.hasNext();) {
result.remove(iter.next());
}
return result;
}
public void deleteStateFiles() {
try {
File stateFile = new File(getConfigurationLocation(), EXTENSION_COUNT_XML);
stateFile.delete();
stateFile = new File(getConfigurationLocation(), EXTENSION_NAMES_XML);
stateFile.delete();
} catch (RuntimeException e) {
}
}
}
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