//--------------------------------------------------------------------------
// 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;
/**
* @author Luke Blanshard (blanshlu@netscape.net)
* @author Drew Davidson (drew@ognl.org)
*/
public abstract class
ExpressionNode extends
SimpleNode
{
public
ExpressionNode(int
i) {
super(
i);
}
public
ExpressionNode(
OgnlParser p, int
i) {
super(
p,
i);
}
/**
Returns true iff this node is constant without respect to the children.
*/
public boolean
isNodeConstant(
OgnlContext context ) throws
OgnlException
{
return false;
}
public boolean
isConstant(
OgnlContext context ) throws
OgnlException
{
boolean
result =
isNodeConstant(
context);
if ((
_children != null) && (
_children.length > 0)) {
result = true;
for ( int
i=0;
result && (
i <
_children.length); ++
i ) {
if (
_children[
i] instanceof
SimpleNode) {
result = ((
SimpleNode)
_children[
i]).
isConstant(
context );
} else {
result = false;
}
}
}
return
result;
}
public
String getExpressionOperator(int
index)
{
throw new
RuntimeException("unknown operator for " +
OgnlParserTreeConstants.
jjtNodeName[
_id]);
}
public
String toString()
{
String result = (
_parent == null) ? "" : "(";
if ((
_children != null) && (
_children.length > 0)) {
for ( int
i = 0;
i <
_children.length; ++
i ) {
if (
i > 0) {
result += " " +
getExpressionOperator(
i) + " ";
}
result +=
_children[
i].
toString();
}
}
if (
_parent != null) {
result =
result + ")";
}
return
result;
}
public
String toGetSourceString(
OgnlContext context,
Object target)
{
String result = (
_parent == null ||
NumericExpression.class.
isAssignableFrom(
_parent.
getClass())) ? "" : "(";
if ((
_children != null) && (
_children.length > 0)) {
for ( int
i = 0;
i <
_children.length; ++
i ) {
if (
i > 0) {
result += " " +
getExpressionOperator(
i) + " ";
}
String value =
_children[
i].
toGetSourceString(
context,
target);
if ((
ASTProperty.class.
isInstance(
_children[
i]) ||
ASTMethod.class.
isInstance(
_children[
i])
||
ASTSequence.class.
isInstance(
_children[
i]) ||
ASTChain.class.
isInstance(
_children[
i]))
&&
value != null &&
value.
trim().
length() > 0) {
String pre = null;
if (
ASTMethod.class.
isInstance(
_children[
i]))
{
pre = (
String)
context.
get("_currentChain");
}
if (
pre == null)
pre = "";
String cast = (
String)
context.
remove(
ExpressionCompiler.
PRE_CAST);
if (
cast == null)
cast = "";
value =
cast +
ExpressionCompiler.
getRootExpression(
_children[
i],
context.
getRoot(),
context) +
pre +
value;
}
result +=
value;
}
}
if (
_parent != null && !
NumericExpression.class.
isAssignableFrom(
_parent.
getClass())) {
result =
result + ")";
}
return
result;
}
public
String toSetSourceString(
OgnlContext context,
Object target)
{
String result = (
_parent == null) ? "" : "(";
if ((
_children != null) && (
_children.length > 0)) {
for ( int
i = 0;
i <
_children.length; ++
i ) {
if (
i > 0) {
result += " " +
getExpressionOperator(
i) + " ";
}
result +=
_children[
i].
toSetSourceString(
context,
target);
}
}
if (
_parent != null) {
result =
result + ")";
}
return
result;
}
@
Override
public boolean
isOperation(
OgnlContext context) throws
OgnlException {
return true;
}
}