001/* 002 * Copyright 2002-2014 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; 022 023/** 024 * Represents a dot separated sequence of strings that indicate a package qualified type 025 * reference. 026 * 027 * <p>Example: "java.lang.String" as in the expression "new java.lang.String('hello')" 028 * 029 * @author Andy Clement 030 * @since 3.0 031 */ 032public class QualifiedIdentifier extends SpelNodeImpl { 033 034 // TODO safe to cache? dont think so 035 private TypedValue value; 036 037 038 public QualifiedIdentifier(int pos, SpelNodeImpl... operands) { 039 super(pos, operands); 040 } 041 042 043 @Override 044 public TypedValue getValueInternal(ExpressionState state) throws EvaluationException { 045 // Cache the concatenation of child identifiers 046 if (this.value == null) { 047 StringBuilder sb = new StringBuilder(); 048 for (int i = 0; i < getChildCount(); i++) { 049 Object value = this.children[i].getValueInternal(state).getValue(); 050 if (i > 0 && !value.toString().startsWith("$")) { 051 sb.append("."); 052 } 053 sb.append(value); 054 } 055 this.value = new TypedValue(sb.toString()); 056 } 057 return this.value; 058 } 059 060 @Override 061 public String toStringAST() { 062 StringBuilder sb = new StringBuilder(); 063 if (this.value != null) { 064 sb.append(this.value.getValue()); 065 } 066 else { 067 for (int i = 0; i < getChildCount(); i++) { 068 if (i > 0) { 069 sb.append("."); 070 } 071 sb.append(getChild(i).toStringAST()); 072 } 073 } 074 return sb.toString(); 075 } 076 077}