spoon.template.ExpressionTemplate Maven / Gradle / Ivy
/*
* Spoon - http://spoon.gforge.inria.fr/
* Copyright (C) 2006 INRIA Futurs
*
* This software is governed by the CeCILL-C License under French law and
* abiding by the rules of distribution of free software. You can use, modify
* and/or redistribute the software under the terms of the CeCILL-C license as
* circulated by CEA, CNRS and INRIA at http://www.cecill.info.
*
* 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 CeCILL-C License for more details.
*
* The fact that you are presently reading this means that you have had
* knowledge of the CeCILL-C license and that you accept its terms.
*/
package spoon.template;
import spoon.reflect.code.CtBlock;
import spoon.reflect.code.CtExpression;
import spoon.reflect.code.CtReturn;
import spoon.reflect.declaration.CtClass;
import spoon.reflect.declaration.CtSimpleType;
/**
* This class represents an expression template parameter expressed in Java.
*
*
* To define a new expression template parameter, you must subclass this class
* and implement the {@link #expression()} method, which actually defines the
* Java expression. It corresponds to a {@link spoon.reflect.code.CtExpression}.
*/
public abstract class ExpressionTemplate implements TemplateParameter,
Template {
/**
* Returns the expression.
*/
@SuppressWarnings("unchecked")
public static CtExpression getExpression(
CtClass> p) {
CtBlock b = getExpressionBlock(p);
return ((CtReturn) b.getStatements().get(0)).getReturnedExpression();
}
private static CtBlock getExpressionBlock(
CtClass> p) {
CtBlock b = p.getMethod("expression").getBody();
return b;
}
/**
* Creates a new expression template parameter.
*/
public ExpressionTemplate() {
}
/**
* This method must be implemented to define the template expression. The
* convention is that the defined expression corresponds to the expression
* returned by the return statement of the method.
*/
public abstract T expression() throws Throwable;
@SuppressWarnings("unchecked")
public CtExpression getSubstitution(CtSimpleType targetType) {
CtClass> c;
CtBlock b;
c = targetType.getFactory().Class().get(this.getClass());
if (c == null) {
c = targetType.getFactory().Class().get(this.getClass());
}
if (this instanceof Template) {
b = Substitution
.substitute(targetType, this, getExpressionBlock(c));
} else {
b = targetType.getFactory().Core().clone(getExpressionBlock(c));
}
return ((CtReturn) b.getStatements().get(0)).getReturnedExpression();
}
public T S() {
return null;
}
}