/*
* Redberry: symbolic tensor computations.
*
* Copyright (c) 2010-2012:
* 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.tensor.functions;
import cc.redberry.core.context.ToStringMode;
import cc.redberry.core.indices.Indices;
import cc.redberry.core.indices.IndicesFactory;
import cc.redberry.core.tensor.Tensor;
import cc.redberry.core.tensor.TensorException;
import cc.redberry.core.utils.TensorUtils;
/**
* @author Dmitry Bolotin
* @author Stanislav Poslavsky
*/
public abstract class ScalarFunction extends Tensor {
protected final Tensor argument;
protected ScalarFunction(Tensor argument) {
if (!TensorUtils.isScalar(argument))
throw new TensorException("Non scalar argument " + argument + " in scalar function");
this.argument = argument;
}
@Override
public final Indices getIndices() {
return IndicesFactory.EMPTY_INDICES;
}
protected abstract String functionName();
public abstract Tensor derivative();
@Override
public final Tensor get(int i) {
if (i != 0)
throw new IndexOutOfBoundsException();
return argument;
}
@Override
public final int size() {
return 1;
}
@Override
public final String toString(ToStringMode mode) {
String stringSymbol = functionName();
switch (mode) {
case UTF8:
return stringSymbol + "(" + argument.toString(ToStringMode.UTF8) + ")";
case LaTeX:
return "\\" + stringSymbol.toLowerCase() + "(" + argument.toString(ToStringMode.UTF8) + ")";
case REDBERRY:
return Character.toString(Character.toUpperCase(stringSymbol.charAt(0))) + stringSymbol.substring(1, stringSymbol.length()) + "[" + argument.toString(ToStringMode.REDBERRY) + "]";
default:
return stringSymbol + "(" + argument.toString(ToStringMode.UTF8) + ")";
}
}
}