/*
* Copyright 2012, the Dart project authors.
*
* Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.eclipse.org/legal/epl-v10.html
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.dart.engine.ast;
import com.google.dart.engine.scanner.Token;
/**
* Instances of the class {@code ThrowExpression} represent a throw expression.
*
* <pre>
* throwExpression ::=
* 'throw' {@link Expression expression}
* </pre>
*
* @coverage dart.engine.ast
*/
public class ThrowExpression extends Expression {
/**
* The token representing the 'throw' keyword.
*/
private Token keyword;
/**
* The expression computing the exception to be thrown.
*/
private Expression expression;
/**
* Initialize a newly created throw expression.
*
* @param keyword the token representing the 'throw' keyword
* @param expression the expression computing the exception to be thrown
*/
public ThrowExpression(Token keyword, Expression expression) {
this.keyword = keyword;
this.expression = becomeParentOf(expression);
}
@Override
public <R> R accept(AstVisitor<R> visitor) {
return visitor.visitThrowExpression(this);
}
@Override
public Token getBeginToken() {
return keyword;
}
@Override
public Token getEndToken() {
if (expression != null) {
return expression.getEndToken();
}
return keyword;
}
/**
* Return the expression computing the exception to be thrown.
*
* @return the expression computing the exception to be thrown
*/
public Expression getExpression() {
return expression;
}
/**
* Return the token representing the 'throw' keyword.
*
* @return the token representing the 'throw' keyword
*/
public Token getKeyword() {
return keyword;
}
@Override
public int getPrecedence() {
return 0;
}
/**
* Set the expression computing the exception to be thrown to the given expression.
*
* @param expression the expression computing the exception to be thrown
*/
public void setExpression(Expression expression) {
this.expression = becomeParentOf(expression);
}
/**
* Set the token representing the 'throw' keyword to the given token.
*
* @param keyword the token representing the 'throw' keyword
*/
public void setKeyword(Token keyword) {
this.keyword = keyword;
}
@Override
public void visitChildren(AstVisitor<?> visitor) {
safelyVisitChild(expression, visitor);
}
}