com.jfinal.template.expr.ast.MethodInfo Maven / Gradle / Ivy

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/**
 * Copyright (c) 2011-2021, James Zhan 詹波 ([email protected]).
 *
 * 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
 *
 *      http://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 com.jfinal.template.expr.ast;

import java.lang.reflect.Array;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

/**
 * MethodInfo
 */
public class MethodInfo {
	
	protected final Long key;
	protected final Class clazz;
	protected final Method method;
	
	protected final boolean isVarArgs;
	protected final Class[] paraTypes;
	
	public MethodInfo(Long key, Class clazz, Method method) {
		this.key = key;
		this.clazz = clazz;
		this.method = method;
		this.isVarArgs = method.isVarArgs();
		this.paraTypes = method.getParameterTypes();
	}
	
	public Object invoke(Object target, Object... args) throws ReflectiveOperationException {
		if (isVarArgs) {
			return invokeVarArgsMethod(target, args);
		} else {
			return method.invoke(target, args);
		}
	}
	
	protected Object invokeVarArgsMethod(Object target, Object[] argValues) throws ReflectiveOperationException {
		Object[] finalArgValues = new Object[paraTypes.length];
		
		int fixedParaLength = paraTypes.length - 1;
		System.arraycopy(argValues, 0, finalArgValues, 0, fixedParaLength);
		Class varParaComponentType = paraTypes[paraTypes.length - 1].getComponentType();
		Object varParaValues = Array.newInstance(varParaComponentType, argValues.length - fixedParaLength);
		int p = 0;
		for (int i=fixedParaLength; i[] getParameterTypes() {
		return paraTypes;
	}
	
	public String toString() {
		StringBuilder ret = new StringBuilder(clazz.getName()).append(".").append(method.getName()).append("(");
		for (int i=0; i 0) {
				ret.append(", ");
			}
			ret.append(paraTypes[i].getName());
		}
		return ret.append(")").toString();
	}
	
	// --------- 以下代码仅用于支持 NullMethodInfo
	
	/**
	 * 仅供 NullMethodInfo 继承使用
	 */
	protected MethodInfo() {
		this.key = null;
		this.clazz = null;
		this.method = null;
		this.isVarArgs = false;
		this.paraTypes = null;
	}
	
	/**
	 * 仅仅 NullMethodInfo 会覆盖此方法并返回 false
	 *
	 * 1：MethodKit.getMethod(...) 消除 instanceof 判断
	 * 2：Method.exec(...) 消除 null 值判断
	 */
	public boolean notNull() {
		return true;
	}
}