//--------------------------------------------------------------------------
// 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.ExpressionCompiler;
import ognl.enhance.UnsupportedCompilationException;
/**
* @author Luke Blanshard (blanshlu@netscape.net)
* @author Drew Davidson (drew@ognl.org)
*/
public class ASTAnd extends BooleanExpression
{
public ASTAnd(int id) {
super(id);
}
public ASTAnd(OgnlParser p, int id) {
super(p, id);
}
public void jjtClose() {
flattenTree();
}
protected Object getValueBody( OgnlContext context, Object source )
throws OgnlException
{
Object result = null;
int last = _children.length - 1;
for ( int i=0; i <= last; ++i )
{
result = _children[i].getValue( context, source );
if ( i != last && ! OgnlOps.booleanValue(result) )
break;
}
return result;
}
protected void setValueBody( OgnlContext context, Object target, Object value )
throws OgnlException
{
int last = _children.length - 1;
for ( int i=0; i < last; ++i )
{
Object v = _children[i].getValue( context, target );
if ( ! OgnlOps.booleanValue(v) )
return;
}
_children[last].setValue( context, target, value );
}
public String getExpressionOperator(int index)
{
return "&&";
}
public Class getGetterClass()
{
return null;
}
public String toGetSourceString(OgnlContext context, Object target)
{
if (_children.length != 2)
throw new UnsupportedCompilationException("Can only compile boolean expressions with two children.");
String result = "";
try {
String first = OgnlRuntime.getChildSource(context, target, _children[0]);
if (!OgnlOps.booleanValue(context.getCurrentObject()))
{
throw new UnsupportedCompilationException("And expression can't be compiled until all conditions are true.");
}
if (!OgnlRuntime.isBoolean(first) && !context.getCurrentType().isPrimitive())
first = OgnlRuntime.getCompiler().createLocalReference(context, first, context.getCurrentType());
String second = OgnlRuntime.getChildSource(context, target, _children[1]);
if (!OgnlRuntime.isBoolean(second) && !context.getCurrentType().isPrimitive())
second = OgnlRuntime.getCompiler().createLocalReference(context, second, context.getCurrentType());
result += "(ognl.OgnlOps.booleanValue(" + first + ")";
result += " ? ";
result += " ($w) (" + second + ")";
result += " : ";
result += " ($w) (" + first + ")";
result += ")";
context.setCurrentObject(target);
context.setCurrentType(Object.class);
} catch (NullPointerException e) {
throw new UnsupportedCompilationException("evaluation resulted in null expression.");
} catch (Throwable t)
{
throw OgnlOps.castToRuntime(t);
}
return result;
}
public String toSetSourceString(OgnlContext context, Object target)
{
if (_children.length != 2)
throw new UnsupportedCompilationException("Can only compile boolean expressions with two children.");
String pre = (String)context.get("_currentChain");
if (pre == null)
pre = "";
String result = "";
try {
if (!OgnlOps.booleanValue(_children[0].getValue(context, target)))
{
throw new UnsupportedCompilationException("And expression can't be compiled until all conditions are true.");
}
String first = ExpressionCompiler.getRootExpression(_children[0], context.getRoot(), context)
+ pre + _children[0].toGetSourceString(context, target);
_children[1].getValue(context, target);
String second = ExpressionCompiler.getRootExpression(_children[1], context.getRoot(), context)
+ pre + _children[1].toSetSourceString(context, target);
if (!OgnlRuntime.isBoolean(first))
result += "if(ognl.OgnlOps.booleanValue(" + first + ")){";
else
result += "if(" + first + "){";
result += second;
result += "; } ";
context.setCurrentObject(target);
context.setCurrentType(Object.class);
} catch (Throwable t)
{
throw OgnlOps.castToRuntime(t);
}
return result;
}
}