// --------------------------------------------------------------------------
// 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.
Array;
import java.util.
Map;
/**
* Implementation of PropertyAccessor that uses numbers and dynamic subscripts as properties to
* index into Java arrays.
*
* @author Luke Blanshard (blanshlu@netscape.net)
* @author Drew Davidson (drew@ognl.org)
*/
public class
ArrayPropertyAccessor extends
ObjectPropertyAccessor implements
PropertyAccessor
{
public
Object getProperty(
Map context,
Object target,
Object name)
throws
OgnlException
{
Object result = null;
if (
name instanceof
String)
{
if (
name.
equals("length"))
{
result = new
Integer(
Array.
getLength(
target));
} else
{
result = super.getProperty(
context,
target,
name);
}
} else
{
Object index =
name;
if (
index instanceof
DynamicSubscript)
{
int
len =
Array.
getLength(
target);
switch(((
DynamicSubscript)
index).
getFlag())
{
case
DynamicSubscript.
ALL:
result =
Array.
newInstance(
target.
getClass().
getComponentType(),
len);
System.
arraycopy(
target, 0,
result, 0,
len);
break;
case
DynamicSubscript.
FIRST:
index = new
Integer((
len > 0) ? 0 : -1);
break;
case
DynamicSubscript.
MID:
index = new
Integer((
len > 0) ? (
len / 2) : -1);
break;
case
DynamicSubscript.
LAST:
index = new
Integer((
len > 0) ? (
len - 1) : -1);
break;
}
}
if (
result == null)
{
if (
index instanceof
Number)
{
int
i = ((
Number)
index).
intValue();
result = (
i >= 0) ?
Array.
get(
target,
i) : null;
} else
{
throw new
NoSuchPropertyException(
target,
index);
}
}
}
return
result;
}
public void
setProperty(
Map context,
Object target,
Object name,
Object value)
throws
OgnlException
{
Object index =
name;
boolean
isNumber = (
index instanceof
Number);
if (
isNumber || (
index instanceof
DynamicSubscript))
{
TypeConverter converter = ((
OgnlContext)
context).
getTypeConverter();
Object convertedValue;
convertedValue =
converter.
convertValue(
context,
target, null,
name.
toString(),
value,
target.
getClass().
getComponentType());
if (
isNumber)
{
int
i = ((
Number)
index).
intValue();
if (
i >= 0)
{
Array.
set(
target,
i,
convertedValue);
}
} else
{
int
len =
Array.
getLength(
target);
switch(((
DynamicSubscript)
index).
getFlag())
{
case
DynamicSubscript.
ALL:
System.
arraycopy(
target, 0,
convertedValue, 0,
len);
return;
case
DynamicSubscript.
FIRST:
index = new
Integer((
len > 0) ? 0 : -1);
break;
case
DynamicSubscript.
MID:
index = new
Integer((
len > 0) ? (
len / 2) : -1);
break;
case
DynamicSubscript.
LAST:
index = new
Integer((
len > 0) ? (
len - 1) : -1);
break;
}
}
} else {
if (
name instanceof
String)
{
super.setProperty(
context,
target,
name,
value);
} else
{
throw new
NoSuchPropertyException(
target,
index);
}
}
}
public
String getSourceAccessor(
OgnlContext context,
Object target,
Object index)
{
String indexStr =
index.
toString();
// need to convert to primitive for list index access
// System.out.println("index class " + index.getClass() + " current type " + context.getCurrentType() + " current object class " + context.getCurrentObject().getClass());
if (
context.
getCurrentType() != null && !
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.
setCurrentAccessor(
target.
getClass());
context.
setCurrentType(
target.
getClass().
getComponentType());
return "[" +
indexStr + "]";
}
public
String getSourceSetter(
OgnlContext context,
Object target,
Object index)
{
String indexStr =
index.
toString();
// need to convert to primitive for list index access
if (
context.
getCurrentType() != null && !
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 + ")";
}
Class type =
target.
getClass().
isArray() ?
target.
getClass().
getComponentType() :
target.
getClass();
context.
setCurrentAccessor(
target.
getClass());
context.
setCurrentType(
target.
getClass().
getComponentType());
if (
type.
isPrimitive())
{
Class wrapClass =
OgnlRuntime.
getPrimitiveWrapperClass(
type);
return "[" +
indexStr + "]=((" +
wrapClass.
getName() + ")ognl.OgnlOps.convertValue($3," +
wrapClass.
getName()
+ ".class, true))." +
OgnlRuntime.
getNumericValueGetter(
wrapClass);
} else
{
return "[" +
indexStr + "]=ognl.OgnlOps.convertValue($3," +
type.
getName() + ".class)";
}
}
}