// --------------------------------------------------------------------------
// 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 (blanshlu@netscape.net)
* @author Drew Davidson (drew@ognl.org)
*/
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 key = ((
String)
index).
replaceAll("\"", "");
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().
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().
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)";
}
}