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Diffstat (limited to 'libjava/gnu/xml/xpath/SumFunction.java')
-rw-r--r-- | libjava/gnu/xml/xpath/SumFunction.java | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/libjava/gnu/xml/xpath/SumFunction.java b/libjava/gnu/xml/xpath/SumFunction.java new file mode 100644 index 0000000..1501b46 --- /dev/null +++ b/libjava/gnu/xml/xpath/SumFunction.java @@ -0,0 +1,94 @@ +/* SumFunction.java -- + Copyright (C) 2004 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA +02111-1307 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package gnu.xml.xpath; + +import java.util.Collection; +import java.util.Iterator; +import java.util.List; +import org.w3c.dom.Node; + +/** + * The <code>sum</code> function returns the sum, for each node in the + * argument node-set, of the result of converting the string-values of the + * node to a number. + * + * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> + */ +final class SumFunction + extends Expr +{ + + final Expr arg; + + SumFunction(List args) + { + this((Expr) args.get(0)); + } + + SumFunction(Expr arg) + { + this.arg = arg; + } + + public Object evaluate(Node context, int pos, int len) + { + Object val = arg.evaluate(context, pos, len); + double sum = 0.0d; + if (val instanceof Collection) + { + for (Iterator i = ((Collection) val).iterator(); i.hasNext(); ) + { + Node node = (Node) i.next(); + String s = stringValue(node); + sum += _number(context, s); + } + } + return new Double(sum); + } + + public Expr clone(Object context) + { + return new SumFunction(arg.clone(context)); + } + + public String toString() + { + return "sum(" + arg + ")"; + } + +} |