137 lines
5.0 KiB
Java
137 lines
5.0 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 java.lang.reflect.InvocationTargetException;
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import com.jfinal.template.TemplateException;
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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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* Method : expr '.' ID '(' exprList? ')'
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*
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* 每次通过 MethodKit.getMethod(...) 取 MethodInfo 而不是用属性持有其对象
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* 是为了支持 target 对象的动态类型，MethodInfo 中的 Method 被调用 15 次以后
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* 会被 JDK 动态生成 GeneratedAccessorXXX 字节码，性能不是问题
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* 唯一的性能损耗是从 HashMap 中获取 MethodInfo 对象，可以忽略不计
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*
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* 如果在未来通过结合 #dynamic(boolean) 指令来优化，需要在 Ctrl 中引入一个
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* boolean dynamic = false 变量，而不能在 Env、Scope 引入该变量
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*
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* 还需要引入一个 NullMethodInfo 以及 notNull() 方法，此优化复杂度提高不少，
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* 暂时不做此优化
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*/
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public class Method extends Expr {
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private Expr expr;
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private String methodName;
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private ExprList exprList;
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public Method(Expr expr, String methodName, ExprList exprList, Location location) {
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if (exprList == null || exprList.length() == 0) {
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throw new ParseException("The parameter of method can not be blank", location);
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}
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init(expr, methodName, exprList, location);
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}
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public Method(Expr expr, String methodName, Location location) {
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init(expr, methodName, ExprList.NULL_EXPR_LIST, location);
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}
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private void init(Expr expr, String methodName, ExprList exprList, Location location) {
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if (expr == null) {
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throw new ParseException("The target for method invoking can not be blank", location);
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}
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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.expr = expr;
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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 target = expr.eval(scope);
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if (target == null) {
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if (scope.getCtrl().isNullSafe()) {
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return null;
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}
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throw new TemplateException("The target for method invoking can not be null, method name: " + methodName, location);
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}
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Object[] argValues = exprList.evalExprList(scope);
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try {
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MethodInfo methodInfo = MethodKit.getMethod(target.getClass(), methodName, argValues);
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if (methodInfo != null) {
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return methodInfo.invoke(target, argValues);
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}
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if (scope.getCtrl().isNullSafe()) {
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return null;
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}
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throw new TemplateException(buildMethodNotFoundSignature("public method not found: " + target.getClass().getName() + ".", methodName, argValues), location);
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} catch (TemplateException | ParseException e) {
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throw e;
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} catch (InvocationTargetException e) {
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Throwable t = e.getTargetException();
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if (t == null) {t = e;}
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throw new TemplateException(t.getMessage(), location, t);
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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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static String buildMethodNotFoundSignature(String preMsg, String methodName, Object[] argValues) {
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StringBuilder ret = new StringBuilder().append(preMsg).append(methodName).append("(");
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if (argValues != null) {
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for (int i = 0; i < argValues.length; i++) {
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if (i > 0) {
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ret.append(", ");
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}
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ret.append(argValues[i] != null ? argValues[i].getClass().getName() : "null");
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}
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}
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return ret.append(")").toString();
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}
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/*
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public static Object invokeVarArgsMethod(java.lang.reflect.Method method, Object target, Object[] argValues) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException {
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Class<?>[] paraTypes = method.getParameterTypes();
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Object[] finalArgValues = new Object[paraTypes.length];
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int fixedParaLength = paraTypes.length - 1;
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System.arraycopy(argValues, 0, finalArgValues, 0, fixedParaLength);
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Class<?> varParaComponentType = paraTypes[paraTypes.length - 1].getComponentType();
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Object varParaValues = Array.newInstance(varParaComponentType, argValues.length - fixedParaLength);
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int p = 0;
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for (int i=fixedParaLength; i<argValues.length; i++) {
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Array.set(varParaValues, p++, argValues[i]);
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}
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finalArgValues[paraTypes.length - 1] = varParaValues;
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return method.invoke(target, finalArgValues);
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}*/
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}
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