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/*
* $Id: PPColWidthFunction.java,v 1.3 2003/03/05 21:59:47 jeremias Exp $
* ============================================================================
* The Apache Software License, Version 1.1
* ============================================================================
*
* Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, 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 acknowledgment: "This product includes software
* developed by the Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "FOP" 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 name, without prior written permission of the
* Apache Software Foundation.
*
* 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 (INCLU-
* DING, 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 and was originally created by
* James Tauber <jtauber@jtauber.com>. For more information on the Apache
* Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.fop.fo.expr;
import org.apache.fop.fo.properties.Property;
import org.apache.fop.fo.properties.TableColLength;
/**
* Class modelling the proportional-column-width function. See Sec. 5.10.4 of
* the XSL-FO standard.
*/
public class PPColWidthFunction extends FunctionBase {
/**
* @return 1 (the number of arguments for the proportional-column-width
* function)
*/
public int nbArgs() {
return 1;
}
/**
*
* @param args array of arguments for this function
* @param pInfo PropertyInfo for this function
* @return numeric Property containing the units of proportional measure
* for this column
* @throws PropertyException for non-numeric operand, or if the parent
* element is not a table-column
*/
public Property eval(Property[] args,
PropertyInfo pInfo) throws PropertyException {
Number d = args[0].getNumber();
if (d == null) {
throw new PropertyException("Non numeric operand to "
+ "proportional-column-width function");
}
if (!pInfo.getPropertyList().getElement().equals("fo:table-column")) {
throw new PropertyException("proportional-column-width function "
+ "may only be used on table-column FO");
}
// Check if table-layout is "fixed"...
return new TableColLength(d.doubleValue(), pInfo.getFO());
}
}
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