//--------------------------------------------------------------------------
// 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 ariba.util.expr;
import ariba.util.fieldvalue.FieldPath;
import ariba.util.core.Assert;
import ariba.util.core.ClassUtil;
import ariba.util.fieldtype.TypeInfo;
import ariba.util.fieldtype.PrimitiveTypeProvider;
/**
* @author Luke Blanshard (blanshlu@netscape.net)
* @author Drew Davidson (drew@ognl.org)
*/
class ASTProperty extends SimpleNode implements Symbol
{
/*
Use of a cached field path provides us with fast field lookup -- the <class, field> accessor
is cached and reapplied (without lookup) if the class still matches. Since these cache the
java reflection field/method (or compiled accessor) this approaches optimally efficient.
*/
FieldPath _fieldPath;
public ASTProperty(int id)
{
super(id);
}
public ASTProperty(ExprParser p, int id)
{
super(p, id);
}
public void jjtClose()
{
Assert.that(children != null && children.length == 1 && children[0] instanceof ASTConst,
"Property node must have constant child");
// String fieldName = ((ASTConst)children[0]).getValue().toString();
_fieldPath = new FieldPath(toString());
}
protected Object getValueBody( ExprContext context, Object source ) throws ExprException
{
Integer symbolKind = context.getSymbolKind(this);
if (Symbol.Field.equals(symbolKind) &&
(source instanceof TypeInfo)) {
// If the source is a TypeInfo, then the property is a static
// field of the type/class.
String typeName = ((TypeInfo)source).getName();
return ExprRuntime.getStaticField(context, typeName, getName());
}
else if (Symbol.Variable.equals(symbolKind)) {
return context.get(getName());
}
else if (Symbol.Type.equals(symbolKind)) {
return context.getSymbolType(this);
}
else {
Object value = ExprRuntime.convert(source);
value = _fieldPath.getFieldValue(value);
return ExprRuntime.convert(value);
}
}
protected void setValueBody( ExprContext context, Object target, Object value ) throws ExprException
{
Integer symbolKind = context.getSymbolKind(this);
if (Symbol.Field.equals(symbolKind) &&
(target instanceof TypeInfo)) {
// If the source is a TypeInfo, then the property is a static
// field of the type/class.
String typeName = ((TypeInfo)target).getName();
ExprRuntime.setStaticField(context, typeName, getName(), value);
}
else if (Symbol.Variable.equals(symbolKind)) {
context.put(getName(), value);
}
else {
// Convert the primitive to the type of this property. This is
// necessary because numeric literal are Integer or Double and
// there is no cast operation to convert to the property type.
TypeInfo nodeType = getTypeInfo();
value = TypeConversionHelper.convertPrimitive(nodeType, value);
_fieldPath.setFieldValue(target, value);
}
}
public boolean isNodeSimpleProperty( ExprContext context ) throws ExprException
{
return true; // (children != null) && (children.length == 1) && ((SimpleNode)children[0]).isConstant(context);
}
public String toString()
{
return ((ASTConst)children[0]).getValue().toString();
}
public String getName ()
{
return _fieldPath._fieldName;
}
public void accept (ASTNodeVisitor visitor)
{
acceptChildren(visitor);
visitor.visit(this);
}
}