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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 org.apache.ibatis.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 ([email protected])
* @author Drew Davidson ([email protected])
*/
public class ArrayPropertyAccessor extends ObjectPropertyAccessor
implements PropertyAccessor // This is here to make javadoc show this class as an implementor
{
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);
}
}
}
}
