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// --------------------------------------------------------------------------
// 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 ognl;
import java.lang.reflect.Method;
import java.util.*;
/**
* Implementation of PropertyAccessor that uses numbers and dynamic subscripts as properties to
* index into Lists.
*
* @author Luke Blanshard ([email protected])
* @author Drew Davidson ([email protected])
*/
public class ListPropertyAccessor extends ObjectPropertyAccessor implements PropertyAccessor
{
public Object getProperty(Map context, Object target, Object name)
throws OgnlException
{
List list = (List) target;
if (name instanceof String) {
Object result = null;
if (name.equals("size")) {
result = new Integer(list.size());
} else {
if (name.equals("iterator")) {
result = list.iterator();
} else {
if (name.equals("isEmpty") || name.equals("empty")) {
result = list.isEmpty() ? Boolean.TRUE : Boolean.FALSE;
} else {
result = super.getProperty(context, target, name);
}
}
}
return result;
}
if (name instanceof Number)
return list.get(((Number) name).intValue());
if (name instanceof DynamicSubscript) {
int len = list.size();
switch(((DynamicSubscript) name).getFlag()) {
case DynamicSubscript.FIRST:
return len > 0 ? list.get(0) : null;
case DynamicSubscript.MID:
return len > 0 ? list.get(len / 2) : null;
case DynamicSubscript.LAST:
return len > 0 ? list.get(len - 1) : null;
case DynamicSubscript.ALL:
return new ArrayList(list);
}
}
throw new NoSuchPropertyException(target, name);
}
public void setProperty(Map context, Object target, Object name, Object value)
throws OgnlException
{
if (name instanceof String && ((String)name).indexOf("$") < 0) {
super.setProperty(context, target, name, value);
return;
}
List list = (List) target;
if (name instanceof Number) {
list.set(((Number) name).intValue(), value);
return;
}
if (name instanceof DynamicSubscript) {
int len = list.size();
switch(((DynamicSubscript) name).getFlag()) {
case DynamicSubscript.FIRST:
if (len > 0) list.set(0, value);
return;
case DynamicSubscript.MID:
if (len > 0) list.set(len / 2, value);
return;
case DynamicSubscript.LAST:
if (len > 0) list.set(len - 1, value);
return;
case DynamicSubscript.ALL:
{
if (!(value instanceof Collection)) throw new OgnlException("Value must be a collection");
list.clear();
list.addAll((Collection) value);
return;
}
}
}
throw new NoSuchPropertyException(target, name);
}
public Class getPropertyClass(OgnlContext context, Object target, Object index)
{
if (index instanceof String) {
String indexStr = (String)index;
String key = (indexStr.indexOf('"') >= 0? indexStr.replaceAll("\"", "") : indexStr);
if (key.equals("size")) {
return int.class;
} else {
if (key.equals("iterator")) {
return Iterator.class;
} else {
if (key.equals("isEmpty") || key.equals("empty")) {
return boolean.class;
} else {
return super.getPropertyClass(context, target, index);
}
}
}
}
if (index instanceof Number)
return Object.class;
return null;
}
public String getSourceAccessor(OgnlContext context, Object target, Object index)
{
String indexStr = index.toString();
if (indexStr.indexOf('"') >= 0)
indexStr = indexStr.replaceAll("\"", "");
if (String.class.isInstance(index))
{
if (indexStr.equals("size"))
{
context.setCurrentAccessor(List.class);
context.setCurrentType(int.class);
return ".size()";
} else
{
if (indexStr.equals("iterator"))
{
context.setCurrentAccessor(List.class);
context.setCurrentType(Iterator.class);
return ".iterator()";
} else
{
if (indexStr.equals("isEmpty") || indexStr.equals("empty"))
{
context.setCurrentAccessor(List.class);
context.setCurrentType(boolean.class);
return ".isEmpty()";
}
}
}
}
// TODO: This feels really inefficient, must be some better way
// check if the index string represents a method on a custom class implementing java.util.List instead..
if (context.getCurrentObject() != null && !Number.class.isInstance(context.getCurrentObject()))
{
try {
Method m = OgnlRuntime.getReadMethod(target.getClass(), indexStr);
if (m != null)
return super.getSourceAccessor(context, target, index);
} catch (Throwable t)
{
throw OgnlOps.castToRuntime(t);
}
}
context.setCurrentAccessor(List.class);
// need to convert to primitive for list index access
// System.out.println("Curent type: " + context.getCurrentType() + " current object type " + context.getCurrentObject().getClass());
if (!context.getCurrentType().isPrimitive() && Number.class.isAssignableFrom(context.getCurrentType()))
{
indexStr += "." + OgnlRuntime.getNumericValueGetter(context.getCurrentType());
} else if (context.getCurrentObject() != null && Number.class.isAssignableFrom(context.getCurrentObject().getClass())
&& !context.getCurrentType().isPrimitive())
{
// means it needs to be cast first as well
String toString = String.class.isInstance(index) && context.getCurrentType() != Object.class ? "" : ".toString()";
indexStr = "ognl.OgnlOps#getIntValue(" + indexStr + toString + ")";
}
context.setCurrentType(Object.class);
return ".get(" + indexStr + ")";
}
public String getSourceSetter(OgnlContext context, Object target, Object index)
{
String indexStr = index.toString();
if (indexStr.indexOf('"') >= 0)
indexStr = indexStr.replaceAll("\"", "");
// TODO: This feels really inefficient, must be some better way
// check if the index string represents a method on a custom class implementing java.util.List instead..
/* System.out.println("Listpropertyaccessor setter using index: " + index + " and current object: " + context.getCurrentObject()
+ " number is current object? " + Number.class.isInstance(context.getCurrentObject()));*/
if (context.getCurrentObject() != null && !Number.class.isInstance(context.getCurrentObject()))
{
try {
Method m = OgnlRuntime.getWriteMethod(target.getClass(), indexStr);
if (m != null || !context.getCurrentType().isPrimitive())
{
// System.out.println("super source setter returned: " + super.getSourceSetter(context, target, index));
return super.getSourceSetter(context, target, index);
}
} catch (Throwable t)
{
throw OgnlOps.castToRuntime(t);
}
}
/* if (String.class.isInstance(index))
{
context.setCurrentAccessor(List.class);
return "";
}*/
context.setCurrentAccessor(List.class);
// need to convert to primitive for list index access
if (!context.getCurrentType().isPrimitive() && Number.class.isAssignableFrom(context.getCurrentType()))
{
indexStr += "." + OgnlRuntime.getNumericValueGetter(context.getCurrentType());
} else if (context.getCurrentObject() != null && Number.class.isAssignableFrom(context.getCurrentObject().getClass())
&& !context.getCurrentType().isPrimitive())
{
// means it needs to be cast first as well
String toString = String.class.isInstance(index) && context.getCurrentType() != Object.class ? "" : ".toString()";
indexStr = "ognl.OgnlOps#getIntValue(" + indexStr + toString + ")";
}
context.setCurrentType(Object.class);
return ".set(" + indexStr + ", $3)";
}
}
