/**
* This file Copyright (c) 2005-2008 Aptana, Inc. This program is
* dual-licensed under both the Aptana Public License and the GNU General
* Public license. You may elect to use one or the other of these licenses.
*
* This program is distributed in the hope that it will be useful, but
* AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
* NONINFRINGEMENT. Redistribution, except as permitted by whichever of
* the GPL or APL you select, is prohibited.
*
* 1. For the GPL license (GPL), you can redistribute and/or modify this
* program under the terms of the GNU General Public License,
* Version 3, as published by the Free Software Foundation. You should
* have received a copy of the GNU General Public License, Version 3 along
* with this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Aptana provides a special exception to allow redistribution of this file
* with certain other free and open source software ("FOSS") code and certain additional terms
* pursuant to Section 7 of the GPL. You may view the exception and these
* terms on the web at http://www.aptana.com/legal/gpl/.
*
* 2. For the Aptana Public License (APL), this program and the
* accompanying materials are made available under the terms of the APL
* v1.0 which accompanies this distribution, and is available at
* http://www.aptana.com/legal/apl/.
*
* You may view the GPL, Aptana's exception and additional terms, and the
* APL in the file titled license.html at the root of the corresponding
* plugin containing this source file.
*
* Any modifications to this file must keep this entire header intact.
*/
package com.aptana.ide.interpreters;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.Platform;
import com.aptana.ide.core.IdeLog;
/**
* Manager of interpreters..
* @author Denis Denisenko
*/
public class Interpreters
{
/**
* Default interpreter info.
* @author Denis Denisenko
*
*/
private static class DefaultInterpreterInfo
{
public IInterpreter interperter;
public int priority;
}
/**
* Extension point name.
*/
private static final String EXTENSION_POINT_NAME = "com.aptana.ide.interpreters.interpreterProvider"; //$NON-NLS-1$
/**
* Provider element name.
*/
private static final String PROVIDER_ELEMENT_NAME = "provider"; //$NON-NLS-1$
/**
* Class attribute name.
*/
private static final String CLASS_ATTRIBUTE_NAME = "class"; //$NON-NLS-1$
/**
* Language attribute name.
*/
private static final String LANGUAGE_ATTRIBUTE_NAME = "lang"; //$NON-NLS-1$
/**
* Priority attribute name.
*/
private static final String PRIORITY_ATTRIBUTE_NAME = "priority"; //$NON-NLS-1$
/**
* OS attribute name.
*/
private static final String OS_ATTRIBUTE_NAME = "OpSystem"; //$NON-NLS-1$
/**
* Singleton instance.
*/
private static Interpreters instance = new Interpreters();
/**
* Cached interpreters.
*/
private Map<String, List<IInterpreter>> interpreters;
/**
* Default interpreters.
*/
private Map<String, DefaultInterpreterInfo> defaultInterpreters;
/**
* Gets default Interpreters instance.
* @return default Interpreters instance.
*/
public static Interpreters getDefault()
{
return instance;
}
/**
* Gets language interpreters.
* @param language - language to get interpreters for.
* @return language interpreters.
*/
public synchronized List<IInterpreter> getInterpreters(String language)
{
collectInterpretersInfo();
List<IInterpreter> result = interpreters.get(language);
if (result == null)
{
result = Collections.emptyList();
}
return result;
}
/**
* Gets default interpreter for a language.
* @param language - language to get default interpreter for.
* @return default interpreter for a language.
*/
public synchronized IInterpreter getDefaultInterpreter(String language)
{
collectInterpretersInfo();
DefaultInterpreterInfo info = defaultInterpreters.get(language);
if (info == null)
{
return null;
}
return info.interperter;
}
/**
* Collects interpreters information.
*/
private void collectInterpretersInfo()
{
interpreters = new HashMap<String, List<IInterpreter>>();
defaultInterpreters = new HashMap<String, DefaultInterpreterInfo>();
IExtensionRegistry registry = Platform.getExtensionRegistry();
IExtensionPoint ep = registry.getExtensionPoint(EXTENSION_POINT_NAME);
if (ep != null)
{
IExtension[] extensions = ep.getExtensions();
for (int i = 0; i < extensions.length; i++)
{
IExtension extension = extensions[i];
IConfigurationElement[] elements = extension.getConfigurationElements();
for (int j = 0; j < elements.length; j++)
{
IConfigurationElement element = elements[j];
String elementName = element.getName();
if (elementName.equals(PROVIDER_ELEMENT_NAME))
{
String language = element.getAttribute(LANGUAGE_ATTRIBUTE_NAME);
String os = element.getAttribute(OS_ATTRIBUTE_NAME);
String currentOS = System.getProperty("os.name").toLowerCase(); //$NON-NLS-1$
if (os != null && os.length() != 0 && !currentOS.startsWith(os))
{
continue;
}
int priority = 0;
String priorityString = element.getAttribute(PRIORITY_ATTRIBUTE_NAME);
if (priorityString != null)
{
try
{
priority = Integer.parseInt(priorityString);
}
catch (NumberFormatException ex)
{
IdeLog.logError(IDECorePlugin.getDefault(),
Messages.getString("Interpreters.ERR_WrongPriorityFormatPrefix") + elementName //$NON-NLS-1$
+ Messages.getString("Interpreters.ERR_WrongPriorityFormatSuffix")); //$NON-NLS-1$
}
}
try
{
IInterpreterProvider provider =
(IInterpreterProvider) element.createExecutableExtension(CLASS_ATTRIBUTE_NAME);
List<IInterpreter> currentInterpreters;
try
{
currentInterpreters = provider.getInterpreters();
List<IInterpreter> oldInterpreters = interpreters.get(language);
if (oldInterpreters == null)
{
oldInterpreters = new ArrayList<IInterpreter>();
}
oldInterpreters.addAll(currentInterpreters);
interpreters.put(language, oldInterpreters);
IInterpreter defaultInterpreter = provider.getDefaultInterpreter();
if (defaultInterpreter != null)
{
DefaultInterpreterInfo oldInfo = defaultInterpreters.get(language);
if (oldInfo == null || oldInfo.priority < priority)
{
DefaultInterpreterInfo newInfo = new DefaultInterpreterInfo();
newInfo.priority = priority;
newInfo.interperter = defaultInterpreter;
defaultInterpreters.put(language, newInfo);
}
}
}
catch(Throwable th)
{
IdeLog.logError(IDECorePlugin.getDefault(),
Messages.getString("Interpreters.ERR_UnableToGetInterpretersFromProvider"), th); //$NON-NLS-1$
}
} catch (CoreException e)
{
IdeLog.logError(IDECorePlugin.getDefault(), Messages.getString("Interpreters.ERR_UnableCreatingProvider"), e); //$NON-NLS-1$
}
}
}
}
}
}
/**
* InterpretersManager private constructor.
*/
private Interpreters()
{
}
}