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1   /*
2    * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/DefaultFunctionCallExpr.java,v 1.14 2005/09/06 13:41:01 elharo Exp $
3    * $Revision: 1.14 $
4    * $Date: 2005/09/06 13:41:01 $
5    *
6    * ====================================================================
7    *
8    * Copyright (C) 2000-2004 bob mcwhirter & James Strachan.
9    * All rights reserved.
10   *
11   * Redistribution and use in source and binary forms, with or without
12   * modification, are permitted provided that the following conditions
13   * are met:
14   *
15   * 1. Redistributions of source code must retain the above copyright
16   *    notice, this list of conditions, and the following disclaimer.
17   *
18   * 2. Redistributions in binary form must reproduce the above copyright
19   *    notice, this list of conditions, and the disclaimer that follows
20   *    these conditions in the documentation and/or other materials
21   *    provided with the distribution.
22   *
23   * 3. The name "Jaxen" must not be used to endorse or promote products
24   *    derived from this software without prior written permission.  For
25   *    written permission, please contact license@jaxen.org.
26   *
27   * 4. Products derived from this software may not be called "Jaxen", nor
28   *    may "Jaxen" appear in their name, without prior written permission
29   *    from the Jaxen Project Management (pm@jaxen.org).
30   *
31   * In addition, we request (but do not require) that you include in the
32   * end-user documentation provided with the redistribution and/or in the
33   * software itself an acknowledgement equivalent to the following:
34   *     "This product includes software developed by the
35   *      Jaxen Project <http://www.jaxen.org/>."
36   * Alternatively, the acknowledgment may be graphical using the logos
37   * available at http://www.jaxen.org/
38   *
39   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
40   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
41   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
42   * DISCLAIMED.  IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT
43   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
45   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
46   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
47   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
48   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
49   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50   * SUCH DAMAGE.
51   *
52   * ====================================================================
53   * This software consists of voluntary contributions made by many
54   * individuals on behalf of the Jaxen Project and was originally
55   * created by bob mcwhirter <bob@werken.com> and
56   * James Strachan <jstrachan@apache.org>.  For more information on the
57   * Jaxen Project, please see <http://www.jaxen.org/>.
58   *
59   * $Id: DefaultFunctionCallExpr.java,v 1.14 2005/09/06 13:41:01 elharo Exp $
60   */
61  
62  package org.jaxen.expr;
63  
64  import java.util.ArrayList;
65  import java.util.Iterator;
66  import java.util.List;
67  
68  import org.jaxen.Context;
69  import org.jaxen.Function;
70  import org.jaxen.JaxenException;
71  
72  /***
73   * @deprecated this class will become non-public in the future;
74   *     use the interface instead
75   */
76  public class DefaultFunctionCallExpr extends DefaultExpr implements FunctionCallExpr
77  {
78      private String prefix;
79      private String functionName;
80      private List parameters;
81  
82      public DefaultFunctionCallExpr(String prefix, String functionName)
83      {
84          this.prefix = prefix;
85          this.functionName = functionName;
86          this.parameters = new ArrayList();
87      }
88  
89      public void addParameter(Expr parameter)
90      {
91          this.parameters.add(parameter);
92      }
93  
94  
95      public List getParameters()
96      {
97          return this.parameters;
98      }
99  
100     public String getPrefix()
101     {
102         return this.prefix;
103     }
104 
105     public String getFunctionName()
106     {
107         return this.functionName;
108     }
109 
110 
111     public String getText()
112     {
113         StringBuffer buf = new StringBuffer();
114         String prefix = getPrefix();
115 
116         if (prefix != null &&
117                 prefix.length() > 0)
118         {
119             buf.append(prefix);
120             buf.append(":");
121         }
122 
123         buf.append(getFunctionName());
124         buf.append("(");
125 
126         Iterator paramIter = getParameters().iterator();
127 
128         while (paramIter.hasNext()) {
129             Expr eachParam = (Expr) paramIter.next();
130 
131             buf.append(eachParam.getText());
132 
133             if (paramIter.hasNext())
134             {
135                 buf.append(", ");
136             }
137         }
138 
139         buf.append(")");
140 
141         return buf.toString();
142     }
143 
144     public Expr simplify()
145     {
146         List paramExprs = getParameters();
147         int paramSize = paramExprs.size();
148 
149         List newParams = new ArrayList(paramSize);
150 
151         for (int i = 0; i < paramSize; ++i)
152         {
153             Expr eachParam = (Expr) paramExprs.get(i);
154 
155             newParams.add(eachParam.simplify());
156         }
157 
158         this.parameters = newParams;
159 
160         return this;
161     }
162 
163 
164     public String toString()
165     {
166         String prefix = getPrefix();
167 
168         if (prefix == null)
169         {
170             return "[(DefaultFunctionCallExpr): " + getFunctionName() + "(" + getParameters() + ") ]";
171         }
172 
173         return "[(DefaultFunctionCallExpr): " + getPrefix() + ":" + getFunctionName() + "(" + getParameters() + ") ]";
174     }
175 
176     public Object evaluate(Context context) throws JaxenException
177     {
178         String namespaceURI =
179                 context.translateNamespacePrefixToUri(getPrefix());
180 
181         Function func = context.getFunction(namespaceURI,
182                 getPrefix(),
183                 getFunctionName());
184         List paramValues = evaluateParams(context);
185 
186         return func.call(context, paramValues);
187     }
188 
189     public List evaluateParams(Context context) throws JaxenException
190     {
191         List paramExprs = getParameters();
192         int paramSize = paramExprs.size();
193 
194         List paramValues = new ArrayList(paramSize);
195 
196         for (int i = 0; i < paramSize; ++i)
197         {
198             Expr eachParam = (Expr) paramExprs.get(i);
199 
200             Object eachValue = eachParam.evaluate(context);
201 
202             paramValues.add(eachValue);
203         }
204         return paramValues;
205     }
206 
207     public void accept(Visitor visitor)
208     {
209         visitor.visit(this);
210     }
211 }
212