fop/src/org/apache/fop/datatypes/MixedLength.java

/*
 * $Id$
 * Copyright (C) 2001-2002 The Apache Software Foundation. All rights reserved.
 * For details on use and redistribution please refer to the
 * LICENSE file included with these sources.
 */

package org.apache.fop.datatypes;

import java.util.Vector;
import java.util.Enumeration;

import org.apache.fop.fo.expr.Numeric;
import org.apache.fop.fo.expr.PropertyException;

/**
 * A length quantity in XSL which is specified with a mixture
 * of absolute and relative and/or percent components.
 * The actual value may not be computable before layout is done.
 */
public class MixedLength extends Length {

    private Vector lengths ;

    public MixedLength(Vector lengths) {
        this.lengths = lengths;
    }

    protected void computeValue() {
        int computedValue = 0;
        boolean bAllComputed = true;
        Enumeration e = lengths.elements();
        while (e.hasMoreElements()) {
            Length l = (Length) e.nextElement();
            computedValue += l.mvalue();
            if (! l.isComputed()) {
                bAllComputed = false;
            }
        }
        setComputedValue(computedValue, bAllComputed);
    }


    public double getTableUnits() {
        double tableUnits = 0.0;
        Enumeration e = lengths.elements();
        while (e.hasMoreElements()) {
            tableUnits += ((Length) e.nextElement()).getTableUnits();
        }
        return tableUnits;
    }

    public void resolveTableUnit(double dTableUnit) {
        Enumeration e = lengths.elements();
        while (e.hasMoreElements()) {
            ((Length) e.nextElement()).resolveTableUnit(dTableUnit);
        }
    }

    public String toString() {
        StringBuffer sbuf = new StringBuffer();
        Enumeration e = lengths.elements();
        while (e.hasMoreElements()) {
            if (sbuf.length() > 0) {
                sbuf.append('+');
            }
            sbuf.append(e.nextElement().toString());
        }
        return sbuf.toString();
    }

    public Numeric asNumeric() {
        Numeric numeric = null;
        for (Enumeration e = lengths.elements(); e.hasMoreElements();) {
            Length l = (Length) e.nextElement();
            if (numeric == null) {
                numeric = l.asNumeric();
            } else {
                try {
                    Numeric sum = numeric.add(l.asNumeric());
                    numeric = sum;
                } catch (PropertyException pe) {
                    System.err.println(
                      "Can't convert MixedLength to Numeric: " + pe);
                }
            }
        }
        return numeric;
    }
}