| /* TranslateFunction.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.List; |
| import org.w3c.dom.Node; |
| |
| /** |
| * The <code>translate</code> function returns the first argument string |
| * with occurrences of characters in the second argument string replaced by |
| * the character at the corresponding position in the third argument string. |
| * For example, translate("bar","abc","ABC") returns the string BAr. If |
| * there is a character in the second argument string with no character at a |
| * corresponding position in the third argument string (because the second |
| * argument string is longer than the third argument string), then |
| * occurrences of that character in the first argument string are removed. |
| * For example, translate("--aaa--","abc-","ABC") returns "AAA". If a |
| * character occurs more than once in the second argument string, then the |
| * first occurrence determines the replacement character. If the third |
| * argument string is longer than the second argument string, then excess |
| * characters are ignored. |
| * |
| * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> |
| */ |
| final class TranslateFunction |
| extends Expr |
| { |
| |
| final Expr arg1; |
| final Expr arg2; |
| final Expr arg3; |
| |
| TranslateFunction(List args) |
| { |
| this((Expr) args.get(0), (Expr) args.get(1), (Expr) args.get(2)); |
| } |
| |
| TranslateFunction(Expr arg1, Expr arg2, Expr arg3) |
| { |
| this.arg1 = arg1; |
| this.arg2 = arg2; |
| this.arg3 = arg3; |
| } |
| |
| public Object evaluate(Node context, int pos, int len) |
| { |
| Object val1 = arg1.evaluate(context, pos, len); |
| Object val2 = arg2.evaluate(context, pos, len); |
| Object val3 = arg3.evaluate(context, pos, len); |
| String string = _string(context, val1); |
| String search = _string(context, val2); |
| String replace = _string(context, val3); |
| StringBuffer buf = new StringBuffer(); |
| int l1 = string.length(); |
| int l2 = search.length(); |
| int l3 = replace.length(); |
| for (int i = 0; i < l1; i++) |
| { |
| char c = string.charAt(i); |
| boolean replaced = false; |
| for (int j = 0; j < l2; j++) |
| { |
| if (c == search.charAt(j)) |
| { |
| if (j < l3) |
| { |
| buf.append(replace.charAt(j)); |
| } |
| replaced = true; |
| } |
| } |
| if (!replaced) |
| { |
| buf.append(c); |
| } |
| } |
| return new String(buf); |
| } |
| |
| public Expr clone(Object context) |
| { |
| return new TranslateFunction(arg1.clone(context), arg2.clone(context), |
| arg3.clone(context)); |
| } |
| |
| public String toString() |
| { |
| return "translate(" + arg1 + "," + arg2 + "," + arg3 + ")"; |
| } |
| |
| } |