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+/* 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 + ")";
+ }
+
+}