/*
* Redberry: symbolic tensor computations.
*
* Copyright (c) 2010-2014:
* Stanislav Poslavsky <stvlpos@mail.ru>
* Bolotin Dmitriy <bolotin.dmitriy@gmail.com>
*
* This file is part of Redberry.
*
* Redberry is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Redberry 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Redberry. If not, see <http://www.gnu.org/licenses/>.
*/
package cc.redberry.core.context.defaults;
import cc.redberry.core.context.ContextSettings;
import cc.redberry.core.context.OutputFormat;
import cc.redberry.core.indices.IndexType;
/**
* The default Redberry context settings.
*
* <p>
* These default are:<br/>
* metric tensor name = "g",<br/>
* Kronecker tensor name = "d",<br/>
* metric types are: {@link IndexType#LatinLower}, {@link IndexType#LatinUpper}, {@link IndexType#GreekLower}, {@link IndexType#GreekUpper}.</p>
*
* <p>Random seed of {@link cc.redberry.core.context.NameManager} is taken from the command line if {@code redberry.nmseed option is specified},
* or generated randomly.</p>
*
* @author Dmitry Bolotin
* @author Stanislav Poslavsky
* @since 1.0
*/
public final class DefaultContextSettings {
private DefaultContextSettings() {
}
public static ContextSettings create() {
ContextSettings defaultSettings = new ContextSettings(OutputFormat.Redberry, "d");
defaultSettings.setMetricName("g");
defaultSettings.addMetricIndexType(IndexType.LatinLower);
defaultSettings.addMetricIndexType(IndexType.GreekLower);
defaultSettings.addMetricIndexType(IndexType.LatinUpper);
defaultSettings.addMetricIndexType(IndexType.GreekUpper);
//Reading seed from property if exists
if (System.getProperty("redberry.nmseed") != null)
defaultSettings.setNameManagerSeed(Long.parseLong(System.getProperty("redberry.nmseed"), 10));
return defaultSettings;
}
}