spring QualifiedIdentifier 源码
spring QualifiedIdentifier 代码
文件路径：/spring-expression/src/main/java/org/springframework/expression/spel/ast/QualifiedIdentifier.java
/*
* Copyright 2002-2021 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
*
* https://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.springframework.expression.spel.ast;
import org.springframework.expression.EvaluationException;
import org.springframework.expression.TypedValue;
import org.springframework.expression.spel.ExpressionState;
import org.springframework.lang.Nullable;
/**
* Represents a dot separated sequence of strings that indicate a package qualified type
* reference.
*
* <p>Example: "java.lang.String" as in the expression "new java.lang.String('hello')"
*
* @author Andy Clement
* @since 3.0
*/
public class QualifiedIdentifier extends SpelNodeImpl {
@Nullable
private TypedValue value;
public QualifiedIdentifier(int startPos, int endPos, SpelNodeImpl... operands) {
super(startPos, endPos, operands);
}
@Override
public TypedValue getValueInternal(ExpressionState state) throws EvaluationException {
// Cache the concatenation of child identifiers
if (this.value == null) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < getChildCount(); i++) {
Object value = this.children[i].getValueInternal(state).getValue();
if (i > 0 && (value == null || !value.toString().startsWith("$"))) {
sb.append('.');
}
sb.append(value);
}
this.value = new TypedValue(sb.toString());
}
return this.value;
}
@Override
public String toStringAST() {
StringBuilder sb = new StringBuilder();
if (this.value != null) {
sb.append(this.value.getValue());
}
else {
for (int i = 0; i < getChildCount(); i++) {
if (i > 0) {
sb.append('.');
}
sb.append(getChild(i).toStringAST());
}
}
return sb.toString();
}
}
相关信息
相关文章
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
7、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦