Initial revision

From-SVN: r102074
2005-07-16 00:30:23 +00:00
parent 6f4434b39b
commit f911ba985a
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+/* XPathImpl.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.io.IOException;
+import javax.xml.namespace.NamespaceContext;
+import javax.xml.namespace.QName;
+import javax.xml.xpath.XPath;
+import javax.xml.xpath.XPathExpression;
+import javax.xml.xpath.XPathExpressionException;
+import javax.xml.xpath.XPathFunctionResolver;
+import javax.xml.xpath.XPathVariableResolver;
+import org.xml.sax.InputSource;
+
+/**
+ * JAXP XPath implementation.
+ *
+ * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
+ */
+public class XPathImpl
+  implements XPath
+{
+
+  XPathParser parser;
+  NamespaceContext namespaceContext;
+  XPathVariableResolver variableResolver;
+  XPathFunctionResolver functionResolver;
+
+  XPathImpl(NamespaceContext namespaceContext,
+            XPathVariableResolver variableResolver,
+            XPathFunctionResolver functionResolver)
+  {
+    parser = new XPathParser();
+    this.namespaceContext = namespaceContext;
+    this.variableResolver = variableResolver;
+    this.functionResolver = functionResolver;
+    reset();
+  }
+
+  public void reset()
+  {
+    parser.namespaceContext = namespaceContext;
+    parser.variableResolver = variableResolver;
+    parser.functionResolver = functionResolver;
+  }
+
+  public void setXPathVariableResolver(XPathVariableResolver resolver)
+  {
+    parser.variableResolver = resolver;
+  }
+
+  public XPathVariableResolver getXPathVariableResolver()
+  {
+    return parser.variableResolver;
+  }
+
+  public void setXPathFunctionResolver(XPathFunctionResolver resolver)
+  {
+    parser.functionResolver = resolver;
+  }
+
+  public XPathFunctionResolver getXPathFunctionResolver()
+  {
+    return parser.functionResolver;
+  }
+
+  public void setNamespaceContext(NamespaceContext nsContext)
+  {
+    parser.namespaceContext = nsContext;
+  }
+
+  public NamespaceContext getNamespaceContext()
+  {
+    return parser.namespaceContext;
+  }
+
+  public XPathExpression compile(String expression)
+    throws XPathExpressionException
+  {
+    XPathTokenizer tokenizer = new XPathTokenizer(expression);
+    try
+      {
+        return (Expr) parser.yyparse(tokenizer);
+      }
+    catch (IOException e)
+      {
+        throw new XPathExpressionException(e);
+      }
+    catch (XPathParser.yyException e)
+      {
+        throw new XPathExpressionException(expression);
+      }
+  }
+  
+  public Object evaluate(String expression,
+                         Object item,
+                         QName returnType)
+    throws XPathExpressionException
+  {
+    XPathExpression expr = compile(expression);
+    return expr.evaluate(item, returnType);
+  }
+
+  public String evaluate(String expression,
+                         Object item)
+    throws XPathExpressionException
+  {
+    XPathExpression expr = compile(expression);
+    return expr.evaluate(item);
+  }
+
+  public Object evaluate(String expression,
+                         InputSource source,
+                         QName returnType)
+    throws XPathExpressionException
+  {
+    XPathExpression expr = compile(expression);
+    return expr.evaluate(source, returnType);
+  }
+
+  public String evaluate(String expression,
+                         InputSource source)
+    throws XPathExpressionException
+  {
+    XPathExpression expr = compile(expression);
+    return expr.evaluate(source);
+  }
+
+}