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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.
// --------------------------------------------------------------------------
// 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 com.feilong.lib.ognl;
import java.beans.IntrospectionException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Map;
import com.feilong.lib.ognl.enhance.ExpressionCompiler;
import com.feilong.lib.ognl.enhance.UnsupportedCompilationException;
/**
* 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 ([email protected])
* @author Drew Davidson ([email protected])
*/
public class ObjectPropertyAccessor implements PropertyAccessor{
/**
* Returns OgnlRuntime.NotFound if the property does not exist.
*
* @param context
* the current execution context.
* @param target
* the object to get the property from.
* @param name
* the name of the property to get.
* @return the current value of the given property in the given object.
* @throws OgnlException
* if there is an error locating the property in the given object.
*/
public Object getPossibleProperty(Map context,Object target,String name) throws OgnlException{
Object result;
OgnlContext ognlContext = (OgnlContext) context;
try{
if ((result = OgnlRuntime.getMethodValue(ognlContext, target, name, true)) == OgnlRuntime.NotFound){
result = OgnlRuntime.getFieldValue(ognlContext, target, name, true);
}
}catch (IntrospectionException ex){
throw new OgnlException(name, ex);
}catch (OgnlException ex){
throw ex;
}catch (Exception ex){
throw new OgnlException(name, ex);
}
return result;
}
/**
* Returns OgnlRuntime.NotFound if the property does not exist.
*
* @param context
* the current execution context.
* @param target
* the object to set the property in.
* @param name
* the name of the property to set.
* @param value
* the new value for the property.
* @return the Object result of the property set operation.
* @throws OgnlException
* if there is an error setting the property in the given object.
*/
public Object setPossibleProperty(Map context,Object target,String name,Object value) throws OgnlException{
Object result = null;
OgnlContext ognlContext = (OgnlContext) context;
try{
if (!OgnlRuntime.setMethodValue(ognlContext, target, name, value, true)){
result = OgnlRuntime.setFieldValue(ognlContext, target, name, value) ? null : OgnlRuntime.NotFound;
}
if (result == OgnlRuntime.NotFound){
Method m = OgnlRuntime.getWriteMethod(target.getClass(), name);
if (m != null){
result = m.invoke(target, new Object[] { value });
}
}
}catch (IntrospectionException ex){
throw new OgnlException(name, ex);
}catch (OgnlException ex){
throw ex;
}catch (Exception ex){
throw new OgnlException(name, ex);
}
return result;
}
public boolean hasGetProperty(OgnlContext context,Object target,Object oname) throws OgnlException{
try{
return OgnlRuntime.hasGetProperty(context, target, oname);
}catch (IntrospectionException ex){
throw new OgnlException("checking if " + target + " has gettable property " + oname, ex);
}
}
public boolean hasGetProperty(Map context,Object target,Object oname) throws OgnlException{
return hasGetProperty((OgnlContext) context, target, oname);
}
public boolean hasSetProperty(OgnlContext context,Object target,Object oname) throws OgnlException{
try{
return OgnlRuntime.hasSetProperty(context, target, oname);
}catch (IntrospectionException ex){
throw new OgnlException("checking if " + target + " has settable property " + oname, ex);
}
}
public boolean hasSetProperty(Map context,Object target,Object oname) throws OgnlException{
return hasSetProperty((OgnlContext) context, target, oname);
}
@Override
public Object getProperty(Map context,Object target,Object oname) throws OgnlException{
Object result = null;
String name = oname.toString();
result = getPossibleProperty(context, target, name);
if (result == OgnlRuntime.NotFound){
throw new NoSuchPropertyException(target, name);
}
return result;
}
@Override
public void setProperty(Map context,Object target,Object oname,Object value) throws OgnlException{
String name = oname.toString();
Object result = setPossibleProperty(context, target, name, value);
if (result == OgnlRuntime.NotFound){
throw new NoSuchPropertyException(target, name);
}
}
public Class getPropertyClass(OgnlContext context,Object target,Object index){
try{
Method m = OgnlRuntime.getReadMethod(target.getClass(), index.toString());
if (m == null){
if (String.class.isAssignableFrom(index.getClass()) && !target.getClass().isArray()){
String indexStr = (String) index;
String key = (indexStr.indexOf('"') >= 0) ? indexStr.replaceAll("\"", "") : indexStr;
try{
Field f = target.getClass().getField(key);
if (f != null){
return f.getType();
}
}catch (NoSuchFieldException e){
return null;
}
}
return null;
}
return m.getReturnType();
}catch (Throwable t){
throw OgnlOps.castToRuntime(t);
}
}
@Override
public String getSourceAccessor(OgnlContext context,Object target,Object index){
try{
String indexStr = index.toString();
String methodName = (indexStr.indexOf('"') >= 0 ? indexStr.replaceAll("\"", "") : indexStr);
Method m = OgnlRuntime.getReadMethod(target.getClass(), methodName);
// try last ditch effort of checking if they were trying to do reflection via a return method value
if (m == null && context.getCurrentObject() != null){
String currentObjectStr = context.getCurrentObject().toString();
m = OgnlRuntime.getReadMethod(
target.getClass(),
(currentObjectStr.indexOf('"') >= 0 ? currentObjectStr.replaceAll("\"", "") : currentObjectStr));
}
if (m == null){
try{
if (String.class.isAssignableFrom(index.getClass()) && !target.getClass().isArray()){
Field f = target.getClass().getField(methodName);
if (f != null){
context.setCurrentType(f.getType());
context.setCurrentAccessor(f.getDeclaringClass());
return "." + f.getName();
}
}
}catch (NoSuchFieldException e){
// ignore
}
return "";
}
context.setCurrentType(m.getReturnType());
context.setCurrentAccessor(OgnlRuntime.getCompiler().getSuperOrInterfaceClass(m, m.getDeclaringClass()));
return "." + m.getName() + "()";
}catch (Throwable t){
throw OgnlOps.castToRuntime(t);
}
}
@Override
public String getSourceSetter(OgnlContext context,Object target,Object index){
try{
String indexStr = index.toString();
String methodName = (indexStr.indexOf('"') >= 0 ? indexStr.replaceAll("\"", "") : indexStr);
Method m = OgnlRuntime.getWriteMethod(target.getClass(), methodName);
if (m == null && context.getCurrentObject() != null && context.getCurrentObject().toString() != null){
String currentObjectStr = context.getCurrentObject().toString();
m = OgnlRuntime.getWriteMethod(
target.getClass(),
(currentObjectStr.indexOf('"') >= 0 ? currentObjectStr.replaceAll("\"", "") : currentObjectStr));
}
if (m == null || m.getParameterTypes() == null || m.getParameterTypes().length <= 0){
throw new UnsupportedCompilationException(
"Unable to determine setting expression on " + context.getCurrentObject() + " with index of " + index);
}
Class parm = m.getParameterTypes()[0];
String conversion;
if (m.getParameterTypes().length > 1){
throw new UnsupportedCompilationException("Object property accessors can only support single parameter setters.");
}
if (parm.isPrimitive()){
Class wrapClass = OgnlRuntime.getPrimitiveWrapperClass(parm);
conversion = OgnlRuntime.getCompiler().createLocalReference(
context,
"((" + wrapClass.getName() + ")ognl.OgnlOps#convertValue($3," + wrapClass.getName() + ".class, true))."
+ OgnlRuntime.getNumericValueGetter(wrapClass),
parm);
}else if (parm.isArray()){
conversion = OgnlRuntime.getCompiler().createLocalReference(
context,
"(" + ExpressionCompiler.getCastString(parm) + ")ognl.OgnlOps#toArray($3,"
+ parm.getComponentType().getName() + ".class)",
parm);
}else{
conversion = OgnlRuntime.getCompiler().createLocalReference(
context,
"(" + parm.getName() + ")ognl.OgnlOps#convertValue($3," + parm.getName() + ".class)",
parm);
}
context.setCurrentType(m.getReturnType());
context.setCurrentAccessor(OgnlRuntime.getCompiler().getSuperOrInterfaceClass(m, m.getDeclaringClass()));
return "." + m.getName() + "(" + conversion + ")";
}catch (Throwable t){
throw OgnlOps.castToRuntime(t);
}
}
}
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