77 lines
2.4 KiB
Java
77 lines
2.4 KiB
Java
/**
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* Copyright (c) 2011-2019, James Zhan 詹波 (jfinal@126.com).
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.jfinal.template.expr.ast;
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import com.jfinal.template.TemplateException;
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import com.jfinal.template.expr.ast.SharedMethodKit.SharedMethodInfo;
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import com.jfinal.template.stat.Location;
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import com.jfinal.template.stat.ParseException;
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import com.jfinal.template.stat.Scope;
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/**
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* SharedMethod
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*
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* 用法：
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* engine.addSharedMethod(new StrKit());
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* engine.addSharedStaticMethod(MyKit.class);
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*
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* #if (notBlank(para))
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* ....
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* #end
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*
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* 上面代码中的 notBlank 方法来自 StrKit
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*/
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public class SharedMethod extends Expr {
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private SharedMethodKit sharedMethodKit;
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private String methodName;
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private ExprList exprList;
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public SharedMethod(SharedMethodKit sharedMethodKit, String methodName, ExprList exprList, Location location) {
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if (MethodKit.isForbiddenMethod(methodName)) {
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throw new ParseException("Forbidden method: " + methodName, location);
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}
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this.sharedMethodKit = sharedMethodKit;
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this.methodName = methodName;
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this.exprList = exprList;
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this.location = location;
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}
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public Object eval(Scope scope) {
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Object[] argValues = exprList.evalExprList(scope);
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try {
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SharedMethodInfo sharedMethodInfo = sharedMethodKit.getSharedMethodInfo(methodName, argValues);
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if (sharedMethodInfo != null) {
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return sharedMethodInfo.invoke(argValues);
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} else {
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// ShareMethod 相当于是固定的静态的方法，不支持 null safe，null safe 只支持具有动态特征的用法
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throw new TemplateException(Method.buildMethodNotFoundSignature("Shared method not found: ", methodName, argValues), location);
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}
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} catch (TemplateException | ParseException e) {
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throw e;
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} catch (Exception e) {
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throw new TemplateException(e.getMessage(), location, e);
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}
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}
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}
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