org.apache.ibatis.ognl.Node Maven / Gradle / Ivy
//--------------------------------------------------------------------------
// 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
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// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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// DAMAGE.
//--------------------------------------------------------------------------
package org.apache.ibatis.ognl;
/**
* JJTree interface for AST nodes, as modified to handle the OGNL 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 ([email protected])
* @author Drew Davidson ([email protected])
*/
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();
// OGNL additions to Node:
/**
* Extracts the value from the given source object that is appropriate for this node
* within the given context.
*/
public Object getValue(OgnlContext context, Object source) throws OgnlException;
/**
* Sets the given value in the given target as appropriate for this node within the
* given context.
*/
public void setValue(OgnlContext context, Object target, Object value) throws OgnlException;
}