001/* 002 * Copyright 2002-2012 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.beans.factory.parsing; 018 019import org.springframework.util.Assert; 020 021/** 022 * {@link ParseState} entry representing a (possibly indexed) 023 * constructor argument. 024 * 025 * @author Rob Harrop 026 * @author Juergen Hoeller 027 * @since 2.0 028 */ 029public class ConstructorArgumentEntry implements ParseState.Entry { 030 031 private final int index; 032 033 034 /** 035 * Creates a new instance of the {@link ConstructorArgumentEntry} class 036 * representing a constructor argument with a (currently) unknown index. 037 */ 038 public ConstructorArgumentEntry() { 039 this.index = -1; 040 } 041 042 /** 043 * Creates a new instance of the {@link ConstructorArgumentEntry} class 044 * representing a constructor argument at the supplied {@code index}. 045 * @param index the index of the constructor argument 046 * @throws IllegalArgumentException if the supplied {@code index} 047 * is less than zero 048 */ 049 public ConstructorArgumentEntry(int index) { 050 Assert.isTrue(index >= 0, "Constructor argument index must be greater than or equal to zero"); 051 this.index = index; 052 } 053 054 055 @Override 056 public String toString() { 057 return "Constructor-arg" + (this.index >= 0 ? " #" + this.index : ""); 058 } 059 060}