Initial revision

From-SVN: r102074
2005-07-16 00:30:23 +00:00
parent 6f4434b39b
commit f911ba985a
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+/* SubstringFunction.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., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 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 javax.xml.namespace.QName;
+import org.w3c.dom.Node;
+
+/**
+ * The substring function returns the substring of the first argument
+ * starting at the position specified in the second argument with length
+ * specified in the third argument. For example, substring("12345",2,3)
+ * returns "234". If the third argument is not specified, it returns the
+ * substring starting at the position specified in the second argument and
+ * continuing to the end of the string. For example, substring("12345",2)
+ * returns "2345".
+ *
+ * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
+ */
+final class SubstringFunction
+  extends Expr
+{
+
+  final Expr arg1;
+  final Expr arg2;
+  final Expr arg3;
+
+  SubstringFunction(List args)
+  {
+    this((Expr) args.get(0), (Expr) args.get(1),
+         (args.size() > 2) ? (Expr) args.get(2) : null);
+  }
+
+  SubstringFunction(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);
+    String s = _string(context, val1);
+    int p = (val2 instanceof Double) ?
+      ((Double) val2).intValue() :
+        (int) Math.round(_number(context, val2));
+    p--;
+    if (p < 0)
+      {
+        p = 0;
+      }
+
+    int l = s.length() - p;
+    if (l <= 0)
+      {
+        return "";
+      }
+
+    if (arg3 != null)
+      {
+        Object val3 = arg3.evaluate(context, pos, len);
+        int v3 = (val3 instanceof Double) ?
+          ((Double) val3).intValue() :
+            (int) Math.round(_number(context, val3));
+        if (v3 < l) 
+          {
+            l = v3;
+          }
+      }
+
+    return s.substring(p, p + l);
+  }
+
+  public Expr clone(Object context)
+  {
+    return new SubstringFunction(arg1.clone(context), arg2.clone(context),
+                                 (arg3 == null) ? null : arg3.clone(context));
+  }
+
+  public boolean references(QName var)
+  {
+    return (arg1.references(var) || arg2.references(var) ||
+            (arg3 == null) ? false : arg3.references(var));
+  }
+
+  public String toString()
+  {
+    return (arg3 == null) ? "substring(" + arg1 + "," + arg2 + ")" :
+      "substring(" + arg1 + "," + arg2 + "," + arg3 + ")";
+  }
+  
+}