2127637945
Imported GNU Classpath 0.20
* Makefile.am (AM_CPPFLAGS): Add classpath/include.
* java/nio/charset/spi/CharsetProvider.java: New override file.
* java/security/Security.java: Likewise.
* sources.am: Regenerated.
* Makefile.in: Likewise.
From-SVN: r109831
118 lines
3.7 KiB
Java
118 lines
3.7 KiB
Java
/* SubstringFunction.java --
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Copyright (C) 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.xml.xpath;
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import java.util.List;
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import javax.xml.namespace.QName;
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import org.w3c.dom.Node;
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/**
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* The substring function returns the substring of the first argument
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* starting at the position specified in the second argument with length
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* specified in the third argument. For example, substring("12345",2,3)
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* returns "234". If the third argument is not specified, it returns the
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* substring starting at the position specified in the second argument and
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* continuing to the end of the string. For example, substring("12345",2)
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* returns "2345".
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*
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* @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
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*/
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final class SubstringFunction
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extends Expr
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{
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final Expr arg1;
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final Expr arg2;
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final Expr arg3;
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SubstringFunction(List args)
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{
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this((Expr) args.get(0), (Expr) args.get(1),
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(args.size() > 2) ? (Expr) args.get(2) : null);
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}
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SubstringFunction(Expr arg1, Expr arg2, Expr arg3)
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{
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this.arg1 = arg1;
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this.arg2 = arg2;
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this.arg3 = arg3;
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}
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public Object evaluate(Node context, int pos, int len)
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{
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Object val1 = arg1.evaluate(context, pos, len);
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Object val2 = arg2.evaluate(context, pos, len);
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String s = _string(context, val1);
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int p = Expr.intValue(val2) - 1;
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if (p < 0)
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p = 0;
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int l = s.length() - p;
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if (l <= 0)
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return "";
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if (arg3 != null)
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{
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Object val3 = arg3.evaluate(context, pos, len);
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int v3 = Expr.intValue(val3);
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if (v3 < l)
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l = v3;
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}
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return s.substring(p, p + l);
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}
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public Expr clone(Object context)
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{
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return new SubstringFunction(arg1.clone(context), arg2.clone(context),
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(arg3 == null) ? null : arg3.clone(context));
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}
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public boolean references(QName var)
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{
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return (arg1.references(var) || arg2.references(var) ||
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(arg3 == null) ? false : arg3.references(var));
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}
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public String toString()
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{
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return (arg3 == null) ? "substring(" + arg1 + "," + arg2 + ")" :
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"substring(" + arg1 + "," + arg2 + "," + arg3 + ")";
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}
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}
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