122 lines
3.3 KiB
Java
122 lines
3.3 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.Array;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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/**
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* MethodInfo
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*/
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public class MethodInfo {
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protected final Long key;
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protected final Class<?> clazz;
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protected final Method method;
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protected final boolean isVarArgs;
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protected final Class<?>[] paraTypes;
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public MethodInfo(Long key, Class<?> clazz, Method method) {
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this.key = key;
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this.clazz = clazz;
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this.method = method;
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this.isVarArgs = method.isVarArgs();
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this.paraTypes = method.getParameterTypes();
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}
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public Object invoke(Object target, Object... args) throws ReflectiveOperationException {
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if (isVarArgs) {
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return invokeVarArgsMethod(target, args);
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} else {
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return method.invoke(target, args);
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}
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}
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protected Object invokeVarArgsMethod(Object target, Object[] argValues) throws ReflectiveOperationException {
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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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public Long getKey() {
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return key;
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}
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public String getName() {
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return method.getName();
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}
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public boolean isStatic() {
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return Modifier.isStatic(method.getModifiers());
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}
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public boolean isVarArgs() {
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return isVarArgs;
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}
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protected Class<?>[] getParameterTypes() {
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return paraTypes;
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}
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public String toString() {
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StringBuilder ret = new StringBuilder(clazz.getName()).append(".").append(method.getName()).append("(");
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for (int i=0; i<paraTypes.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(paraTypes[i].getName());
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}
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return ret.append(")").toString();
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}
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// --------- 以下代码仅用于支持 NullMethodInfo
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/**
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* 仅供 NullMethodInfo 继承使用
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*/
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protected MethodInfo() {
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this.key = null;
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this.clazz = null;
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this.method = null;
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this.isVarArgs = false;
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this.paraTypes = null;
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}
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/**
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* 仅仅 NullMethodInfo 会覆盖此方法并返回 false
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*
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* 1：MethodKit.getMethod(...) 消除 instanceof 判断
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* 2：Method.exec(...) 消除 null 值判断
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*/
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public boolean notNull() {
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return true;
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}
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}
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