134 lines
4.5 KiB
Java
134 lines
4.5 KiB
Java
/* TranslateFunction.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 <code>translate</code> function returns the first argument string
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* with occurrences of characters in the second argument string replaced by
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* the character at the corresponding position in the third argument string.
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* For example, translate("bar","abc","ABC") returns the string BAr. If
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* there is a character in the second argument string with no character at a
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* corresponding position in the third argument string (because the second
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* argument string is longer than the third argument string), then
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* occurrences of that character in the first argument string are removed.
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* For example, translate("--aaa--","abc-","ABC") returns "AAA". If a
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* character occurs more than once in the second argument string, then the
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* first occurrence determines the replacement character. If the third
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* argument string is longer than the second argument string, then excess
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* characters are ignored.
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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 TranslateFunction
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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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TranslateFunction(List args)
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{
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this((Expr) args.get(0), (Expr) args.get(1), (Expr) args.get(2));
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}
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TranslateFunction(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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Object val3 = arg3.evaluate(context, pos, len);
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String string = _string(context, val1);
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String search = _string(context, val2);
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String replace = _string(context, val3);
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StringBuffer buf = new StringBuffer();
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int l1 = string.length();
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int l2 = search.length();
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int l3 = replace.length();
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for (int i = 0; i < l1; i++)
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{
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char c = string.charAt(i);
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boolean replaced = false;
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for (int j = 0; j < l2; j++)
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{
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if (c == search.charAt(j))
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{
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if (j < l3)
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{
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buf.append(replace.charAt(j));
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}
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replaced = true;
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}
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}
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if (!replaced)
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{
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buf.append(c);
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}
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}
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return new String(buf);
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}
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public Expr clone(Object context)
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{
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return new TranslateFunction(arg1.clone(context), arg2.clone(context),
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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.references(var));
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}
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public String toString()
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{
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return "translate(" + arg1 + "," + arg2 + "," + arg3 + ")";
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}
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}
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