TypedStatementListTemplateParameter.java

/**
 * Copyright (C) 2006-2017 INRIA and contributors
 * Spoon - http://spoon.gforge.inria.fr/
 *
 * 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.CtStatementList;
import spoon.reflect.declaration.CtClass;
import spoon.reflect.declaration.CtType;

/**
 * This class represents a template parameter that defines a statement list
 * directly expressed in Java (the statement list ends with a return statement
 * returning a expression of type <code>R</code>).
 *
 * <p>
 * To define a new statement list template parameter, you must subclass this
 * class and implement the {@link #statements()} method, which actually defines
 * the Java statements. It corresponds to a
 * {@link spoon.reflect.code.CtStatementList}.
 */
public abstract class TypedStatementListTemplateParameter<R> implements TemplateParameter<R> {

	/**
	 * Creates a new statement list template parameter.
	 */
	public TypedStatementListTemplateParameter() {
	}

	public CtStatementList getSubstitution(CtType<?> targetType) {
		CtClass<?> c;
		CtBlock<?> b;
		c = targetType.getFactory().Class().get(this.getClass());
		if (c == null) {
			c = targetType.getFactory().Class().get(this.getClass());
		}
		CtStatementList l = targetType.getFactory().Core().createStatementList();
		if (this instanceof Template) {
			b = Substitution.substitute(targetType, (Template<?>) this, c.getMethod("statements").getBody());
		} else {
			b = c.getMethod("statements").getBody().clone();
		}
		l.setStatements(b.getStatements());
		return l;
	}

	public R S() {
		return null;
	}

	/**
	 * This method must be implemented to define the template statement list.
	 */
	public abstract R statements() throws Throwable;
}