001/* 002 * Copyright 2002-2019 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.expression.spel.ast; 018 019import org.springframework.expression.EvaluationException; 020import org.springframework.expression.TypedValue; 021import org.springframework.expression.spel.ExpressionState; 022import org.springframework.lang.Nullable; 023 024/** 025 * Represents a dot separated sequence of strings that indicate a package qualified type 026 * reference. 027 * 028 * <p>Example: "java.lang.String" as in the expression "new java.lang.String('hello')" 029 * 030 * @author Andy Clement 031 * @since 3.0 032 */ 033public class QualifiedIdentifier extends SpelNodeImpl { 034 035 @Nullable 036 private TypedValue value; 037 038 039 public QualifiedIdentifier(int startPos, int endPos, SpelNodeImpl... operands) { 040 super(startPos, endPos, operands); 041 } 042 043 044 @Override 045 public TypedValue getValueInternal(ExpressionState state) throws EvaluationException { 046 // Cache the concatenation of child identifiers 047 if (this.value == null) { 048 StringBuilder sb = new StringBuilder(); 049 for (int i = 0; i < getChildCount(); i++) { 050 Object value = this.children[i].getValueInternal(state).getValue(); 051 if (i > 0 && (value == null || !value.toString().startsWith("$"))) { 052 sb.append("."); 053 } 054 sb.append(value); 055 } 056 this.value = new TypedValue(sb.toString()); 057 } 058 return this.value; 059 } 060 061 @Override 062 public String toStringAST() { 063 StringBuilder sb = new StringBuilder(); 064 if (this.value != null) { 065 sb.append(this.value.getValue()); 066 } 067 else { 068 for (int i = 0; i < getChildCount(); i++) { 069 if (i > 0) { 070 sb.append("."); 071 } 072 sb.append(getChild(i).toStringAST()); 073 } 074 } 075 return sb.toString(); 076 } 077 078}