package com.alibaba.tamper.core.introspect;
import java.lang.reflect.Method;
import net.sf.cglib.reflect.FastClass;
import net.sf.cglib.reflect.FastMethod;
import com.alibaba.tamper.core.BeanMappingException;
/**
* pojo bean属性的set操作
*
* @author jianghang 2011-5-25 下午01:04:50
*/
public class FastPropertySetExecutor extends AbstractExecutor implements SetExecutor {
private FastMethod method;
public FastPropertySetExecutor(Introspector is, Class<?> clazz, String identifier, Class arg){
super(clazz, identifier);
method = discover(is, clazz, identifier, arg);
}
@Override
public Object invoke(Object key, Object value) throws BeanMappingException {
Object[] pargs = { value };
try {
method.invoke(key, pargs);
return value;
} catch (Exception e) {
throw new BeanMappingException(e);
}
}
@Override
public boolean isAlive() {
return method != null;
}
public static FastMethod discover(Introspector is, Class<?> clazz, String property, Class arg) {
String prefix = "set";
final int start = prefix.length(); // "get" or "is" 情况处理
StringBuilder sb = new StringBuilder(prefix);
sb.append(property);
char c = sb.charAt(start);
sb.setCharAt(start, Character.toUpperCase(c));// 转化为 setXxx()
if (arg == null) { // 参数为空，根据method name进行查找
Method method = is.getJavaMethod(clazz, sb.toString()); // 注意，不加参数进行查找
// lowercase nth char
if (method == null) {
sb.setCharAt(start, Character.toLowerCase(c));
method = is.getJavaMethod(clazz, sb.toString()); // 注意，不加参数进行查找
}
if (method != null) {
FastClass fc = is.getFastClass(clazz);
return fc.getMethod(method);
} else {
return null;
}
} else {// 明确指定参数，根据method name + param进行查找
FastMethod fastMethod = is.getFastMethod(clazz, sb.toString(), arg);
// lowercase nth char
if (fastMethod == null) {
sb.setCharAt(start, Character.toLowerCase(c));
fastMethod = is.getFastMethod(clazz, sb.toString(), arg);
}
return fastMethod;
}
}
public FastMethod getMethod() {
return this.method;
}
}