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Posted to dev@velocity.apache.org by ge...@locus.apache.org on 2000/12/28 17:22:10 UTC
cvs commit: jakarta-velocity/src/java/org/apache/velocity/runtime/parser/node ASTIntegerRange.java
geirm 00/12/28 08:22:05
Added: src/java/org/apache/velocity/runtime/parser/node
ASTIntegerRange.java
Log:
Support for range operator [n..m]
Revision Changes Path
1.1 jakarta-velocity/src/java/org/apache/velocity/runtime/parser/node/ASTIntegerRange.java
Index: ASTIntegerRange.java
===================================================================
/* Generated By:JJTree: Do not edit this line. ASTIntegerRange.java */
/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
* ITS 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
/**
* handles the range 'operator' [ n .. m ]
*
* Please look at the Parser.jjt file which is
* what controls the generation of this class.
*
* @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
* @version $Id: ASTIntegerRange.java,v 1.1 2000/12/28 16:22:00 geirm Exp $
*/
package org.apache.velocity.runtime.parser.node;
import java.util.Vector;
import org.apache.velocity.Context;
import org.apache.velocity.runtime.Runtime;
import org.apache.velocity.runtime.parser.Parser;
public class ASTIntegerRange extends SimpleNode {
public ASTIntegerRange(int id)
{
super(id);
}
public ASTIntegerRange(Parser p, int id)
{
super(p, id);
}
/** Accept the visitor. **/
public Object jjtAccept(ParserVisitor visitor, Object data)
{
return visitor.visit(this, data);
}
/**
* does the real work. Creates an Vector of Integers with the
* right value range
*
* @param context app context used if Left or Right of .. is a ref
* @return Object array of Integers
*/
public Object value(Context context)
{
/*
* get the two range ends
*/
Object left = jjtGetChild(0).value( context );
Object right = jjtGetChild(1).value( context );
/*
* if either is null, lets log and bail
*/
if (left == null || right == null)
{
Runtime.error( ( left == null ? "Left" : "Right" ) + " side of range operator [n..m] has null value."
+ " Operation not possible. "
+ context.getCurrentTemplateName() + " [line " + getLine()
+ ", column " + getColumn() + "]");
return null;
}
/*
* if not an Integer, not much we can do either
*/
if ( !( left instanceof Integer ) || !( right instanceof Integer ))
{
Runtime.error( ( !( left instanceof Integer ) ? "Left" : "Right" )
+ " side of range operator is not a valid type. "
+ "Currently only integers (1,2,3...) and Integer type is supported. "
+ context.getCurrentTemplateName() + " [line " + getLine()
+ ", column " + getColumn() + "]");
return null;
}
/*
* get the two integer values of the ends of the range
*/
int l = ( (Integer) left ).intValue() ;
int r = ( (Integer) right ).intValue();
/*
* find out how many there are
*/
int num = Math.abs( l - r );
num += 1;
/*
* see if your increment is Pos or Neg
*/
int delta = ( l >= r ) ? -1 : 1;
/*
* make the vector and fill it
*/
Object[] foo = new Object[num];
int val = l;
for(int i =0; i < num; i++)
{
foo[i] = new Integer( val );
val += delta;
}
return foo;
}
}