/*
* Copyright (c) 1998-2010 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.el;
import com.caucho.config.types.Signature;
import com.caucho.vfs.WriteStream;
import javax.el.ELContext;
import javax.el.ELException;
import java.io.IOException;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.logging.Level;
/**
* Represents a method call. The expr will evaluate to a method.
*/
public class StaticMethodExpr extends Expr {
private Method _method;
private Marshall []_marshall;
private boolean _isVoid;
/**
* Creates a new method expression.
*
* @param expr the expression generating the method to be called
* @param args the arguments for the method
*/
public StaticMethodExpr(Method method)
{
_method = method;
initMethod();
}
/**
* Creates a new static method.
*
* @param signature signature
*/
public StaticMethodExpr(String signature)
{
try {
Signature sig = new Signature();
sig.addText(signature);
sig.init();
_method = sig.getMethod();
if (_method == null)
throw new RuntimeException(L.l("'{0}' is an unknown method",
sig));
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
throw new RuntimeException(e);
// log.log(Level.FINE, e.toString(), e);
}
initMethod();
}
/**
* Initialize the marshall arguments.
*/
private void initMethod()
{
Class []param = _method.getParameterTypes();
_marshall = new Marshall[param.length];
for (int i = 0; i < _marshall.length; i++) {
_marshall[i] = Marshall.create(param[i]);
}
_isVoid = void.class.equals(_method.getReturnType());
}
/**
* Evaluate the expression as an object.
*
* @param env the variable environment
*/
@Override
public Object getValue(ELContext env)
throws ELException
{
return _method;
}
/**
* Evaluate the expression as an object.
*
* @param env the variable environment
*/
public Object evalMethod(Expr []args,
ELContext env)
throws ELException
{
if (_marshall.length != args.length) {
// jsp/18i8
throw new ELParseException(L.l("Arguments to '{0}' do not match expected length {1}.", _method.getName(), _marshall.length));
}
try {
Object []objs = new Object[args.length];
for (int i = 0; i < _marshall.length; i++)
objs[i] = _marshall[i].marshall(args[i], env);
if (! _isVoid)
return _method.invoke(null, objs);
else {
_method.invoke(null, objs);
return null;
}
} catch (ELException e) {
throw e;
} catch (Exception e) {
throw new ELException(e);
}
}
/**
* Prints the code to create an LongLiteral.
*/
public void printCreate(WriteStream os)
throws IOException
{
os.print("new com.caucho.el.StaticMethodExpr(\"");
printType(os, _method.getReturnType());
os.print(" ");
os.print(_method.getDeclaringClass().getName());
os.print(".");
os.print(_method.getName());
os.print("(");
Class []parameterTypes = _method.getParameterTypes();
for (int i = 0; i < parameterTypes.length; i++) {
if (i != 0)
os.print(", ");
printType(os, parameterTypes[i]);
}
os.print(")");
os.print("\")");
}
private void printType(WriteStream os, Class cl)
throws IOException
{
if (cl.isArray()) {
printType(os, cl.getComponentType());
os.print("[]");
}
else
os.print(cl.getName());
}
private Object writeReplace()
{
StringBuilder sig = new StringBuilder();
addType(sig, _method.getReturnType());
sig.append(" ");
sig.append(_method.getDeclaringClass().getName());
sig.append(".");
sig.append(_method.getName());
sig.append("(");
Class []param = _method.getParameterTypes();
for (int i = 0; i < param.length; i++) {
if (i != 0)
sig.append(",");
addType(sig, param[i]);
}
sig.append(")");
return new Handle(sig.toString());
}
private void addType(StringBuilder sb, Class cl)
{
if (cl.isArray()) {
addType(sb, cl.getComponentType());
sb.append("[]");
}
else
sb.append(cl.getName());
}
/**
* Returns true for equal strings.
*/
public boolean equals(Object o)
{
if (! (o instanceof StaticMethodExpr))
return false;
StaticMethodExpr expr = (StaticMethodExpr) o;
return _method.equals(expr._method);
}
public String toString()
{
return _method.getName();
}
static class Handle implements Serializable {
private String _signature;
private Handle()
{
}
private Handle(String signature)
{
_signature = signature;
}
public Object readResolve()
{
return new StaticMethodExpr(_signature);
}
}
}