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From-SVN: r102074

1 files changed, 163 insertions, 0 deletions

diff --git a/libjava/classpath/gnu/xml/xpath/FunctionCall.java b/libjava/classpath/gnu/xml/xpath/FunctionCall.java
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+/* FunctionCall.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.ArrayList;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.List;
+import javax.xml.namespace.QName;
+import javax.xml.xpath.XPathFunction;
+import javax.xml.xpath.XPathFunctionException;
+import javax.xml.xpath.XPathFunctionResolver;
+import org.w3c.dom.Node;
+
+/**
+ * Executes an XPath core or extension function.
+ *
+ * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
+ */
+public final class FunctionCall
+  extends Expr
+{
+
+  final XPathFunctionResolver resolver;
+  final String name;
+  final List args;
+
+  public FunctionCall(XPathFunctionResolver resolver, String name)
+  {
+    this(resolver, name, Collections.EMPTY_LIST);
+  }
+
+  public FunctionCall(XPathFunctionResolver resolver, String name, List args)
+  {
+    this.resolver = resolver;
+    this.name = name;
+    this.args = args;
+  }
+
+  public Object evaluate(Node context, int pos, int len)
+  {
+    if (resolver != null)
+      {
+        QName qname = QName.valueOf(name);
+				int arity = args.size();
+        XPathFunction function = resolver.resolveFunction(qname, arity);
+        if (function != null)
+          {
+            //System.err.println("Calling "+toString()+" with "+values);
+            if (function instanceof Expr)
+              {
+                if (function instanceof Function)
+                  {
+                    ((Function) function).setArguments(args);
+                  }
+                return ((Expr) function).evaluate(context, pos, len);
+              }
+            else
+              {
+                List values = new ArrayList(arity);
+                for (int i = 0; i < arity; i++)
+                  {
+                    Expr arg = (Expr) args.get(i);
+                    values.add(arg.evaluate(context, pos, len));
+                  }
+                try
+                  {
+                    return function.evaluate(values);
+                  }
+                catch (XPathFunctionException e)
+                  {
+                    e.printStackTrace(System.err); // FIXME
+                    throw new RuntimeException(e.getMessage(), e);
+                  }
+              }
+          }
+      }
+    throw new IllegalArgumentException("Invalid function call: " +
+                                       toString());
+  }
+
+  public Expr clone(Object context)
+  {
+    int len = args.size();
+    List args2 = new ArrayList(len);
+    for (int i = 0; i < len; i++)
+      {
+        args2.add(((Expr) args.get(i)).clone(context));
+      }
+    XPathFunctionResolver r = resolver;
+    if (context instanceof XPathFunctionResolver)
+      {
+        r = (XPathFunctionResolver) context;
+      }
+    return new FunctionCall(r, name, args2);
+  }
+
+  public boolean references(QName var)
+  {
+    for (Iterator i = args.iterator(); i.hasNext(); )
+      {
+        if (((Expr) i.next()).references(var))
+          {
+            return true;
+          }
+      }
+    return false;
+  }
+
+  public String toString()
+  {
+    StringBuffer buf = new StringBuffer();
+    buf.append(name);
+    buf.append('(');
+    int len = args.size();
+    for (int i = 0; i < len; i++)
+      {
+        if (i > 0)
+          {
+            buf.append(',');
+          }
+        buf.append(args.get(i));
+      }
+    buf.append(')');
+    return buf.toString();
+  }
+  
+}