//--------------------------------------------------------------------------
// 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.fieldtype.TypeInfo;
/**
JJTree interface for AST nodes, as modified to handle the AribaExpr operations getValue and
setValue. JJTree's original comment:
All AST nodes must implement this interface. It provides basic
machinery for constructing the parent and child relationships
between nodes.
@author Luke Blanshard (blanshlu@netscape.net)
@author Drew Davidson (drew@ognl.org)
*/
public interface Node
{
/** This method is called after the node has been made the current
node. It indicates that child nodes can now be added to it. */
public void jjtOpen();
/** This method is called after all the child nodes have been
added. */
public void jjtClose();
/** This pair of methods are used to inform the node of its
parent. */
public void jjtSetParent(Node n);
public Node jjtGetParent();
/** This method tells the node to add its argument to the node's
list of children. */
public void jjtAddChild(Node n, int i);
/** This method returns a child node. The children are numbered
from zero, left to right. */
public Node jjtGetChild(int i);
/** Return the number of children the node has. */
public int jjtGetNumChildren();
// AribaExpr additions to Node:
/**
* Extracts the value from the given source object that is appropriate for this node
* within the given context.
*/
public Object getValue( ExprContext context, Object source ) throws ExprException;
/**
* Sets the given value in the given target as appropriate for this node within the
* given context.
*/
public void setValue( ExprContext context, Object target, Object value ) throws ExprException;
/**
@aribaapi ariba
*/
public TypeInfo getTypeInfo ();
/**
@aribaapi ariba
*/
public void setTypeInfo (TypeInfo typeInfo);
/*
* Accept ASTNodeVisitor to visit this node.
*/
public void accept (ASTNodeVisitor visitor);
}