//--------------------------------------------------------------------------
// 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.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
/**
* 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 // This is here to make javadoc show this class as an implementor
{
public Object getProperty(Map context, Object target, Object name) throws OgnlException {
List list = (List) target;
if (name instanceof String) {
Object result;
if (name.equals("size")) {
result = new Integer(list.size());
} else {
if (name.equals("iterator")) {
result = list.iterator();
} else {
if (name.equals("isEmpty")) {
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) {
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);
}
}
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