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ToStringExpression.java
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ToStringExpression.java
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/*
* Copyright (C) 2024 Andre601
*
* Original Copyright and License (C) 2020 Florian Stober
*
* This program 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.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package ch.andre601.expressionparser.expressions;
import ch.andre601.expressionparser.internal.CheckUtil;
/**
* Expression interface to turn an expression into a String.
*/
public interface ToStringExpression extends Expression{
/**
* Method used to return a String value.
*
* @return String value.
*/
String evaluate();
/**
* Creates a new ToStringExpression instance containing the provided String value.
*
* @param value
* The String value for the ToStringExpression to hold.
*
* @return New ToStringExpression instance.
*
* @throws IllegalArgumentException
* Should the provided String be null.
*/
static ToStringExpression literal(String value){
CheckUtil.notNull(value, ToStringExpression.class, "Value");
return new ConstantToStringExpression(value);
}
/**
* Pre-made class that can be used through the {@link #literal(String) literal method} of the ToStringExpression
* interface.
*/
class ConstantToStringExpression implements ToStringExpression{
private final String value;
public ConstantToStringExpression(String value){
this.value = value;
}
@Override
public String evaluate(){
return value;
}
}
}