//--------------------------------------------------------------------------
// Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// 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.
// Neither the name of the Drew Davidson nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS 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
// COPYRIGHT OWNER OR 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.
//--------------------------------------------------------------------------
package ariba.util.expr;
import ariba.util.fieldtype.TypeInfo;
import ariba.util.fieldtype.TypeRetriever;
import ariba.util.fieldtype.JavaTypeRegistry;
import ariba.util.fieldtype.JavaTypeProvider;
import ariba.util.fieldtype.MethodInfo;
import ariba.util.fieldtype.NullTypeInfo;
import ariba.util.core.ListUtil;
import ariba.util.core.ArrayUtil;
import ariba.util.core.Assert;
import java.util.*;
import java.lang.reflect.Method;
/**
* Implementation of PropertyAccessor that uses reflection on the target object's class to
* find a field or a pair of set/get methods with the given property name.
* @author Luke Blanshard (blanshlu@netscape.net)
* @author Drew Davidson (drew@ognl.org)
*/
public class ObjectMethodAccessor implements MethodAccessor
{
/* MethodAccessor interface */
public Object callStaticMethod( Map context, Class targetClass, String methodName, Object[] args ) throws MethodFailedException
{
List methods = getAppropriateMethod(targetClass, methodName, args, true);
return ExprRuntime.callAppropriateMethod( (ExprContext)context, targetClass, null, methodName, null, methods, args );
}
public Object callMethod( Map context, Object target, String methodName, Object[] args ) throws MethodFailedException
{
Class targetClass = (target == null) ? null : target.getClass();
List methods = getAppropriateMethod(targetClass, methodName, args, false);
return ExprRuntime.callAppropriateMethod( (ExprContext)context, target, target, methodName, null, methods, args );
}
private List<Method> getAppropriateMethod (Class targetClass,
String methodName,
Object[] args,
boolean isStatic)
{
if (targetClass == null) {
return null;
}
String className = targetClass.getName();
List <TypeInfo> argTypes = getArgumentTypes(args);
TypeRetriever retriever = JavaTypeRegistry.instance();
TypeInfo targetType = retriever.getTypeInfo(className);
// In the case of nested class loaders we could have a class for which
// classForName() (using the system class loader) might fail,
// so we look up using the class explicitly
// Todo: reconsider the getTypeInfo interface: maybe add class as an (optional) arg
if (targetType == null) {
targetType = ((JavaTypeProvider)JavaTypeProvider.instance()).getTypeInfo(targetClass);
}
if (targetType instanceof JavaTypeProvider.JavaTypeInfo) {
JavaTypeProvider.JavaTypeInfo javaType =
(JavaTypeProvider.JavaTypeInfo)targetType;
MethodInfo methodInfo = javaType.getMethod(
retriever, methodName, argTypes, isStatic);
if (methodInfo != null &&
methodInfo instanceof JavaTypeProvider.JavaMethodInfo)
{
return ListUtil.list(((JavaTypeProvider.JavaMethodInfo)methodInfo).getMethod());
}
}
return null;
}
private List <TypeInfo> getArgumentTypes (Object[] args)
{
TypeRetriever retriever = JavaTypeRegistry.instance();
List result = ListUtil.list();
if (!ArrayUtil.nullOrEmptyArray(args)) {
for (int i=0; i < args.length; i++) {
Object arg = args[i];
TypeInfo type = NullTypeInfo.instance;
if (arg != null) {
Class argCls = arg.getClass();
type = retriever.getTypeInfo(argCls.getName());
Assert.that(type != null,
"Fail to retrieve type for name '%s'.", argCls.getName());
}
result.add(type);
}
}
return result;
}
}