/**
* Copyright (C) 2009 STMicroelectronics
*
* This file is part of "Mind Compiler" is free software: you can redistribute
* it and/or modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Contact: mind@ow2.org
*
* Authors: Ali Erdem Ozcan
* Contributors:
*/
package org.ow2.mind.preproc;
import java.io.IOException;
import java.util.Map;
import org.antlr.runtime.ANTLRFileStream;
import org.antlr.runtime.Lexer;
import org.antlr.runtime.TokenStream;
import org.objectweb.fractal.adl.CompilerError;
import org.objectweb.fractal.adl.error.GenericErrors;
import org.ow2.mind.plugin.ConfigurationElement;
import org.ow2.mind.plugin.PluginManager;
import org.ow2.mind.plugin.util.BooleanEvaluatorHelper;
import org.ow2.mind.preproc.parser.AbstractCPLParser;
public final class ExtensionHelper {
public static final String CPL_EXTENSION = "org.ow2.mind.preproc.cpl-parser";
private static final String FACTORY = "factory";
private static final String CLASS = "class";
private static final String ENABLE_WHEN = "enableWhen";
private static CPLPreprocessorFactory getFactory(
final PluginManager pluginManagerItf, final Map<Object, Object> context) {
final Iterable<ConfigurationElement> extensions = pluginManagerItf
.getConfigurationElements(CPL_EXTENSION, FACTORY);
CPLPreprocessorFactory ppFactory = null;
for (final ConfigurationElement extension : extensions) {
final ConfigurationElement condition = extension.getChild(ENABLE_WHEN);
if (condition == null
|| BooleanEvaluatorHelper.evaluate(condition.getChild(),
pluginManagerItf, context)) {
if (ppFactory != null) {
throw new CompilerError(GenericErrors.GENERIC_ERROR,
"There are more than one extensions for the extension-point '"
+ CPL_EXTENSION + "'. This is illegal.");
}
ppFactory = extension.createInstance(CLASS,
CPLPreprocessorFactory.class);
}
}
if (ppFactory == null) {
ppFactory = new DefaultCPLPreprocessorFactory();
}
return ppFactory;
}
public static Lexer getLexer(final PluginManager pluginManagerItf,
final String inputPath, final Map<Object, Object> context)
throws IOException {
return getFactory(pluginManagerItf, context).getLexer(
new ANTLRFileStream(inputPath));
}
public static AbstractCPLParser getParser(
final PluginManager pluginManagerItf, final TokenStream tokens,
final Map<Object, Object> context) {
return getFactory(pluginManagerItf, context).getParser(tokens);
}
}