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A PHP engine implemented in 100% Java
/*
* Copyright (c) 1998-2012 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.quercus.env;
import com.caucho.quercus.expr.Expr;
import com.caucho.quercus.function.AbstractFunction;
import com.caucho.util.L10N;
/**
* Represents the introspected static function information.
*/
public class JavaOverloadMethod extends AbstractJavaMethod {
private static final L10N L = new L10N(JavaOverloadMethod.class);
private AbstractJavaMethod [][]_methodTable
= new AbstractJavaMethod[0][];
private AbstractJavaMethod [][]_restMethodTable
= new AbstractJavaMethod[0][];
public JavaOverloadMethod(AbstractJavaMethod fun)
{
overload(fun);
}
@Override
public int getMaxArgLength()
{
throw new UnsupportedOperationException();
}
@Override
public int getMinArgLength()
{
throw new UnsupportedOperationException();
}
@Override
public boolean getHasRestArgs()
{
throw new UnsupportedOperationException();
}
/**
* Returns an overloaded java method.
*/
public AbstractJavaMethod overload(AbstractJavaMethod fun)
{
if (fun.getHasRestArgs()) {
int len = fun.getMinArgLength();
if (_restMethodTable.length <= len) {
AbstractJavaMethod [][]restMethodTable
= new AbstractJavaMethod[len + 1][];
System.arraycopy(_restMethodTable, 0,
restMethodTable, 0, _restMethodTable.length);
_restMethodTable = restMethodTable;
}
AbstractJavaMethod []methods = _restMethodTable[len];
if (methods == null)
_restMethodTable[len] = new AbstractJavaMethod[] { fun };
else {
AbstractJavaMethod []newMethods
= new AbstractJavaMethod[methods.length + 1];
System.arraycopy(methods, 0, newMethods, 0, methods.length);
newMethods[methods.length] = fun;
_restMethodTable[len] = newMethods;
}
}
else {
int maxLen = fun.getMaxArgLength();
if (_methodTable.length <= maxLen) {
AbstractJavaMethod [][]methodTable
= new AbstractJavaMethod[maxLen + 1][];
System.arraycopy(_methodTable, 0, methodTable, 0, _methodTable.length);
_methodTable = methodTable;
}
for (int len = fun.getMinArgLength(); len <= maxLen; len++) {
AbstractJavaMethod []methods = _methodTable[len];
if (methods == null)
_methodTable[len] = new AbstractJavaMethod[] { fun };
else {
AbstractJavaMethod []newMethods
= new AbstractJavaMethod[methods.length + 1];
System.arraycopy(methods, 0, newMethods, 0, methods.length);
newMethods[methods.length] = fun;
_methodTable[len] = newMethods;
}
}
}
return this;
}
/**
* Returns the actual function
*/
@Override
public AbstractFunction getActualFunction(Expr []args)
{
if (args.length < _methodTable.length) {
AbstractJavaMethod []methods = _methodTable[args.length];
if (methods != null) {
if (methods.length == 1)
return methods[0];
else
return getBestFitJavaMethod(methods, _restMethodTable, args);
}
else {
if (_restMethodTable.length == 0)
return this;
return getBestFitJavaMethod(methods, _restMethodTable, args);
}
}
else {
if (_restMethodTable.length == 0)
return this;
else
return getBestFitJavaMethod(null, _restMethodTable, args);
}
}
/**
* Evaluates the function.
*/
@Override
public Value callMethod(Env env, QuercusClass qClass, Value qThis,
Value []args)
{
if (args.length < _methodTable.length) {
AbstractJavaMethod []methods = _methodTable[args.length];
if (methods != null) {
if (methods.length == 1)
return methods[0].callMethod(env, qClass, qThis, args);
else {
AbstractJavaMethod method
= getBestFitJavaMethod(methods, _restMethodTable, args);
return method.callMethod(env, qClass, qThis, args);
}
}
else {
if (_restMethodTable.length == 0) {
env.warning(L.l(
"'{0}' overloaded method call with {1} arguments "
+ "does not match any overloaded method",
getName(),
args.length));
return NullValue.NULL;
}
AbstractJavaMethod method
= getBestFitJavaMethod(methods, _restMethodTable, args);
return method.callMethod(env, qClass, qThis, args);
}
}
else {
if (_restMethodTable.length == 0) {
env.warning(L.l(
"'{0}' overloaded method call with {1} "
+ "arguments has too many arguments", getName(), args.length));
return NullValue.NULL;
}
else {
AbstractJavaMethod method
= getBestFitJavaMethod(null, _restMethodTable, args);
return method.callMethod(env, qClass, qThis, args);
}
}
}
/**
* Returns the Java function that matches the args passed in.
*/
private AbstractJavaMethod
getBestFitJavaMethod(AbstractJavaMethod []methods,
AbstractJavaMethod [][]restMethodTable,
Value []args)
{
AbstractJavaMethod minCostJavaMethod = null;
int minCost = Integer.MAX_VALUE;
if (methods != null) {
for (int i = 0; i < methods.length; i++) {
AbstractJavaMethod javaMethod = methods[i];
int cost = javaMethod.getMarshalingCost(args);
if (cost == 0)
return javaMethod;
if (cost <= minCost) {
minCost = cost;
minCostJavaMethod = javaMethod;
}
}
}
for (int i = Math.min(args.length, restMethodTable.length) - 1;
i >= 0;
i--) {
if (restMethodTable[i] == null)
continue;
for (int j = 0; j < restMethodTable[i].length; j++) {
AbstractJavaMethod javaMethod = restMethodTable[i][j];
int cost = javaMethod.getMarshalingCost(args);
if (cost == 0)
return javaMethod;
if (cost <= minCost) {
minCost = cost;
minCostJavaMethod = javaMethod;
}
}
}
return minCostJavaMethod;
}
/**
* Returns the Java function that matches the args passed in.
*/
private AbstractJavaMethod
getBestFitJavaMethod(AbstractJavaMethod []methods,
AbstractJavaMethod [][]restMethodTable,
Expr []args)
{
AbstractJavaMethod minCostJavaMethod = null;
int minCost = Integer.MAX_VALUE;
if (methods != null) {
for (int i = 0; i < methods.length; i++) {
AbstractJavaMethod javaMethod = methods[i];
int cost = javaMethod.getMarshalingCost(args);
if (cost == 0)
return javaMethod;
if (cost <= minCost) {
minCost = cost;
minCostJavaMethod = javaMethod;
}
}
}
for (int i = Math.min(args.length, restMethodTable.length) - 1;
i >= 0;
i--) {
if (restMethodTable[i] == null)
continue;
for (int j = 0; j < restMethodTable[i].length; j++) {
AbstractJavaMethod javaMethod = restMethodTable[i][j];
int cost = javaMethod.getMarshalingCost(args);
if (cost == 0)
return javaMethod;
if (cost <= minCost) {
minCost = cost;
minCostJavaMethod = javaMethod;
}
}
}
return minCostJavaMethod;
}
/**
* Returns the cost of marshaling for this method given the args.
*/
public int getMarshalingCost(Value []args)
{
AbstractJavaMethod []methods = null;
if (args.length < _methodTable.length) {
methods = _methodTable[args.length];
}
AbstractJavaMethod bestFitMethod
= getBestFitJavaMethod(methods, _restMethodTable, args);
return bestFitMethod.getMarshalingCost(args);
}
/**
* Returns the cost of marshaling for this method given the args.
*/
public int getMarshalingCost(Expr []args)
{
throw new UnsupportedOperationException();
/*
int size = _methods.size();
int minCost = Integer.MAX_VALUE;
for (int i = 0; i < size; i++) {
int cost = _methods.get(i).getMarshalingCost(args);
if (cost < minCost)
minCost = cost;
}
return minCost;
*/
}
@Override
public String getName()
{
AbstractJavaMethod method;
for (int i = 0; i < _methodTable.length; i++) {
if (_methodTable[i] != null)
return _methodTable[i][0].getName();
}
return "unknown";
}
public String toString()
{
return getClass().getSimpleName() + "[" + getName() + "]";
}
}