/**
* Copyright (c) 2011-2017, James Zhan 詹波 (jfinal@126.com).
*
* 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.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
/**
* MethodInfo
*/
public class MethodInfo {
protected final String key;
protected final Class<?> clazz;
protected final Method method;
protected final boolean isVarArgs;
protected final Class<?>[] paraTypes;
public MethodInfo(String 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 IllegalAccessException, IllegalArgumentException, InvocationTargetException {
if (isVarArgs) {
return invokeVarArgsMethod(target, args);
} else {
return method.invoke(target, args);
}
}
private Object invokeVarArgsMethod(Object target, Object[] argValues) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException {
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<argValues.length; i++) {
Array.set(varParaValues, p++, argValues[i]);
}
finalArgValues[paraTypes.length - 1] = varParaValues;
return method.invoke(target, finalArgValues);
}
public String getKey() {
return key;
}
public String getName() {
return method.getName();
}
public boolean isStatic() {
return Modifier.isStatic(method.getModifiers());
}
public boolean isVarArgs() {
return isVarArgs;
}
protected Class<?>[] getParameterTypes() {
return paraTypes;
}
public String toString() {
StringBuilder ret = new StringBuilder(clazz.getName()).append(".").append(method.getName()).append("(");
for (int i=0; i<paraTypes.length; i++) {
if (i > 0) {
ret.append(", ");
}
ret.append(paraTypes[i].getName());
}
return ret.append(")").toString();
}
}