//--------------------------------------------------------------------------
// 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 ognl.enhance.UnsupportedCompilationException;
/**
* @author Luke Blanshard (blanshlu@netscape.net)
* @author Drew Davidson (drew@ognl.org)
*/
class ASTTest extends ExpressionNode
{
public ASTTest(int id) {
super(id);
}
public ASTTest(OgnlParser p, int id) {
super(p, id);
}
protected Object getValueBody( OgnlContext context, Object source ) throws OgnlException
{
Object test = _children[0].getValue( context, source );
int branch = OgnlOps.booleanValue(test)? 1 : 2;
return _children[branch].getValue( context, source );
}
protected void setValueBody( OgnlContext context, Object target, Object value ) throws OgnlException
{
Object test = _children[0].getValue( context, target );
int branch = OgnlOps.booleanValue(test)? 1 : 2;
_children[branch].setValue( context, target, value );
}
public String getExpressionOperator(int index)
{
return (index == 1) ? "?" : ":";
}
public String toGetSourceString(OgnlContext context, Object target)
{
if (target == null)
throw new UnsupportedCompilationException("evaluation resulted in null expression.");
if (_children.length != 3)
throw new UnsupportedCompilationException("Can only compile test expressions with two children." + _children.length);
String result = "";
try {
String first = OgnlRuntime.getChildSource(context, target, _children[0]);
if (!OgnlRuntime.isBoolean(first) && !context.getCurrentType().isPrimitive())
first = OgnlRuntime.getCompiler().createLocalReference(context, first, context.getCurrentType());
if (ExpressionNode.class.isInstance(_children[0]))
{
first = "(" + first + ")";
}
String second = OgnlRuntime.getChildSource(context, target, _children[1]);
Class secondType = context.getCurrentType();
if (!OgnlRuntime.isBoolean(second) && !context.getCurrentType().isPrimitive())
second = OgnlRuntime.getCompiler().createLocalReference(context, second, context.getCurrentType());
if (ExpressionNode.class.isInstance(_children[1]))
{
second = "(" + second + ")";
}
String third = OgnlRuntime.getChildSource(context, target, _children[2]);
Class thirdType = context.getCurrentType();
if (!OgnlRuntime.isBoolean(third) && !context.getCurrentType().isPrimitive())
third = OgnlRuntime.getCompiler().createLocalReference(context, third, context.getCurrentType());
if (ExpressionNode.class.isInstance(_children[2]))
{
third = "(" + third + ")";
}
boolean mismatched = (secondType.isPrimitive() && !thirdType.isPrimitive())
|| (!secondType.isPrimitive() && thirdType.isPrimitive()) ? true : false;
result += "ognl.OgnlOps.booleanValue(" + first + ")";
result += " ? ";
result += (mismatched ? " ($w) " : "") + second;
result += " : ";
result += (mismatched ? " ($w) " : "") + third;
context.setCurrentObject(target);
context.setCurrentType(mismatched ? Object.class : secondType);
return result;
} catch (NullPointerException e) {
// expected to happen in some instances
throw new UnsupportedCompilationException("evaluation resulted in null expression.");
} catch (Throwable t)
{
throw OgnlOps.castToRuntime(t);
}
}
}