|
Groovy example source code file (ElvisOperatorExpression.java)
The Groovy ElvisOperatorExpression.java source code/* * Copyright 2003-2007 the original author or authors. * * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 * * 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 org.codehaus.groovy.ast.expr; import org.codehaus.groovy.ast.GroovyCodeVisitor; /** * Represents a short ternary expression x ?: y, which is equal * to * <pre> * def truePart = x * def booleanPart = truePart as boolean * booleanPart? truePart : y * </pre> * Even if x is no atomic expression, x will be evaluated only * once. Example: * <pre> * class Foo { * def index=0 * def getX(){ index++; return index } * } * def foo = new Foo() * def result = foo.x ?: "false case" * assert foo.index == 1 * assert result == 1 * <pre> * * @author <a href="mailto:blackdrag@gmx.org">Jochen Theodorou * @since 1.5 */ public class ElvisOperatorExpression extends TernaryExpression { public ElvisOperatorExpression(Expression base, Expression falseExpression) { super(getBool(base), base, falseExpression); } private static BooleanExpression getBool(Expression base) { BooleanExpression be = new BooleanExpression(base); be.setSourcePosition(base); return be; } public void visit(GroovyCodeVisitor visitor) { visitor.visitShortTernaryExpression(this); } public Expression transformExpression(ExpressionTransformer transformer) { Expression ret = new ElvisOperatorExpression( transformer.transform(getTrueExpression()), transformer.transform(getFalseExpression())); ret.setSourcePosition(this); return ret; } } Other Groovy examples (source code examples)Here is a short list of links related to this Groovy ElvisOperatorExpression.java source code file: |
... this post is sponsored by my books ... | |
![]() #1 New Release! |
![]() FP Best Seller |
Copyright 1998-2024 Alvin Alexander, alvinalexander.com
All Rights Reserved.
A percentage of advertising revenue from
pages under the /java/jwarehouse
URI on this website is
paid back to open source projects.