/*
* Copyright (c) 2003-2007 The Visigoth Software Society. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowledgement:
* "This product includes software developed by the
* Visigoth Software Society (http://www.visigoths.org/)."
* Alternately, this acknowledgement may appear in the software itself,
* if and wherever such third-party acknowledgements normally appear.
*
* 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
* project contributors may be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact visigoths@visigoths.org.
*
* 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
* nor may "FreeMarker" or "Visigoth" appear in their names
* without prior written permission of the Visigoth Software Society.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Visigoth Software Society. For more
* information on the Visigoth Software Society, please see
* http://www.visigoths.org/
*/
package freemarker.ext.beans;
import java.lang.reflect.Array;
import java.lang.reflect.Member;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
/**
* This class is used for constructors and as a base for non-overloaded methods
* @author Attila Szegedi
* @version $Id: $
*/
class SimpleMemberModel
{
private final Member member;
private final Class[] argTypes;
protected SimpleMemberModel(Member member, Class[] argTypes)
{
this.member = member;
this.argTypes = argTypes;
}
Object[] unwrapArguments(List arguments, BeansWrapper wrapper) throws TemplateModelException
{
if(arguments == null) {
arguments = Collections.EMPTY_LIST;
}
boolean varArg = MethodUtilities.isVarArgs(member);
int typeLen = argTypes.length;
if(varArg) {
if(typeLen - 1 > arguments.size()) {
throw new TemplateModelException("Method " + member +
" takes at least " + (typeLen - 1) +
" arguments");
}
}
else if(typeLen != arguments.size()) {
throw new TemplateModelException("Method " + member +
" takes exactly " + typeLen + " arguments");
}
Object[] args = unwrapArguments(arguments, argTypes, wrapper);
if(args != null) {
BeansWrapper.coerceBigDecimals(argTypes, args);
if(varArg && shouldPackVarArgs(args)) {
args = packVarArgs(args, argTypes);
}
}
return args;
}
static Object[] unwrapArguments(List arguments, Class[] argTypes, BeansWrapper w)
throws TemplateModelException
{
if(arguments == null) {
return null;
}
int argsLen = arguments.size();
int typeLen = argTypes.length;
Object[] args = new Object[argsLen];
int min = Math.min(argsLen, typeLen);
Iterator it = arguments.iterator();
for (int i = 0; i < min; i++) {
args[i] = unwrapArgument((TemplateModel)it.next(), argTypes[i], w);
}
for (int i = min; i < argsLen; i++) {
args[i] = unwrapArgument((TemplateModel)it.next(), argTypes[min - 1], w);
}
return args;
}
private static Object unwrapArgument(TemplateModel model, Class type, BeansWrapper w)
throws TemplateModelException {
Object val = w.unwrap(model, type);
if(val == BeansWrapper.CAN_NOT_UNWRAP) {
throw new TemplateModelException("Can not unwrap argument " +
model + " to " + type.getName());
}
return val;
}
private boolean shouldPackVarArgs(Object[] args) {
int l = args.length;
if(l == argTypes.length) {
//assert l > 0; // varArg methods must have at least one declared arg
Object lastArg = args[l - 1];
if(lastArg == null || argTypes[l - 1].getComponentType().isInstance(lastArg)) {
return false;
}
}
return true;
}
static Object[] packVarArgs(Object[] args, Class[] argTypes)
{
int argsLen = args.length;
int typeLen = argTypes.length;
int fixArgsLen = typeLen - 1;
Object varArray = Array.newInstance(argTypes[fixArgsLen],
argsLen - fixArgsLen);
for (int i = fixArgsLen; i < argsLen; i++) {
Array.set(varArray, i - fixArgsLen, args[i]);
}
if(argsLen != typeLen) {
Object[] newArgs = new Object[typeLen];
System.arraycopy(args, 0, newArgs, 0, fixArgsLen);
args = newArgs;
}
args[fixArgsLen] = varArray;
return args;
}
protected Member getMember() {
return member;
}
}