gomp-20050608-branch/libjava/classpath/gnu/xml/xpath/XPathImpl.java

   1 /* XPathImpl.java --
   2    Copyright (C) 2004 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38 package gnu.xml.xpath;
  39
  40 import java.io.IOException;
  41 import javax.xml.namespace.NamespaceContext;
  42 import javax.xml.namespace.QName;
  43 import javax.xml.xpath.XPath;
  44 import javax.xml.xpath.XPathExpression;
  45 import javax.xml.xpath.XPathExpressionException;
  46 import javax.xml.xpath.XPathFunctionResolver;
  47 import javax.xml.xpath.XPathVariableResolver;
  48 import org.xml.sax.InputSource;
  49
  50 /**
  51  * JAXP XPath implementation.
  52  *
  53  * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
  54  */
  55 public class XPathImpl
  56   implements XPath
  57 {
  58
  59   XPathParser parser;
  60   NamespaceContext namespaceContext;
  61   XPathVariableResolver variableResolver;
  62   XPathFunctionResolver functionResolver;
  63
  64   XPathImpl(NamespaceContext namespaceContext,
  65             XPathVariableResolver variableResolver,
  66             XPathFunctionResolver functionResolver)
  67   {
  68     parser = new XPathParser();
  69     this.namespaceContext = namespaceContext;
  70     this.variableResolver = variableResolver;
  71     this.functionResolver = functionResolver;
  72     reset();
  73   }
  74
  75   public void reset()
  76   {
  77     parser.namespaceContext = namespaceContext;
  78     parser.variableResolver = variableResolver;
  79     parser.functionResolver = functionResolver;
  80   }
  81
  82   public void setXPathVariableResolver(XPathVariableResolver resolver)
  83   {
  84     parser.variableResolver = resolver;
  85   }
  86
  87   public XPathVariableResolver getXPathVariableResolver()
  88   {
  89     return parser.variableResolver;
  90   }
  91
  92   public void setXPathFunctionResolver(XPathFunctionResolver resolver)
  93   {
  94     parser.functionResolver = resolver;
  95   }
  96
  97   public XPathFunctionResolver getXPathFunctionResolver()
  98   {
  99     return parser.functionResolver;
 100   }
 101
 102   public void setNamespaceContext(NamespaceContext nsContext)
 103   {
 104     parser.namespaceContext = nsContext;
 105   }
 106
 107   public NamespaceContext getNamespaceContext()
 108   {
 109     return parser.namespaceContext;
 110   }
 111
 112   public XPathExpression compile(String expression)
 113     throws XPathExpressionException
 114   {
 115     XPathTokenizer tokenizer = new XPathTokenizer(expression);
 116     try
 117       {
 118         return (Expr) parser.yyparse(tokenizer);
 119       }
 120     catch (IOException e)
 121       {
 122         throw new XPathExpressionException(e);
 123       }
 124     catch (XPathParser.yyException e)
 125       {
 126         throw new XPathExpressionException(expression);
 127       }
 128   }
 129
 130   public Object evaluate(String expression,
 131                          Object item,
 132                          QName returnType)
 133     throws XPathExpressionException
 134   {
 135     XPathExpression expr = compile(expression);
 136     return expr.evaluate(item, returnType);
 137   }
 138
 139   public String evaluate(String expression,
 140                          Object item)
 141     throws XPathExpressionException
 142   {
 143     XPathExpression expr = compile(expression);
 144     return expr.evaluate(item);
 145   }
 146
 147   public Object evaluate(String expression,
 148                          InputSource source,
 149                          QName returnType)
 150     throws XPathExpressionException
 151   {
 152     XPathExpression expr = compile(expression);
 153     return expr.evaluate(source, returnType);
 154   }
 155
 156   public String evaluate(String expression,
 157                          InputSource source)
 158     throws XPathExpressionException
 159   {
 160     XPathExpression expr = compile(expression);
 161     return expr.evaluate(source);
 162   }
 163
 164 }