//--------------------------------------------------------------------------
// 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;
}
}