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1   /*
2    * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/DefaultFunctionCallExpr.java,v 1.12 2005/03/29 01:12:20 elharo Exp $
3    * $Revision: 1.12 $
4    * $Date: 2005/03/29 01:12:20 $
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 1.12 2005/03/29 01:12:20 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  public class DefaultFunctionCallExpr extends DefaultExpr implements FunctionCallExpr
73  {
74      private String prefix;
75      private String functionName;
76      private List parameters;
77  
78      public DefaultFunctionCallExpr(String prefix, String functionName)
79      {
80          this.prefix = prefix;
81          this.functionName = functionName;
82          this.parameters = new ArrayList();
83      }
84  
85      public void addParameter(Expr parameter)
86      {
87          this.parameters.add(parameter);
88      }
89  
90  
91      public List getParameters()
92      {
93          return this.parameters;
94      }
95  
96      public String getPrefix()
97      {
98          return this.prefix;
99      }
100 
101     public String getFunctionName()
102     {
103         return this.functionName;
104     }
105 
106 
107     public String getText()
108     {
109         StringBuffer buf = new StringBuffer();
110         String prefix = getPrefix();
111 
112         if (prefix != null &&
113                 prefix.length() > 0)
114         {
115             buf.append(prefix);
116             buf.append(":");
117         }
118 
119         buf.append(getFunctionName());
120         buf.append("(");
121 
122         Iterator paramIter = getParameters().iterator();
123 
124         while (paramIter.hasNext()) {
125             Expr eachParam = (Expr) paramIter.next();
126 
127             buf.append(eachParam.getText());
128 
129             if (paramIter.hasNext())
130             {
131                 buf.append(", ");
132             }
133         }
134 
135         buf.append(")");
136 
137         return buf.toString();
138     }
139 
140     public Expr simplify()
141     {
142         List paramExprs = getParameters();
143         int paramSize = paramExprs.size();
144 
145         List newParams = new ArrayList(paramSize);
146 
147         for (int i = 0; i < paramSize; ++i)
148         {
149             Expr eachParam = (Expr) paramExprs.get(i);
150 
151             newParams.add(eachParam.simplify());
152         }
153 
154         this.parameters = newParams;
155 
156         return this;
157     }
158 
159 
160     public String toString()
161     {
162         String prefix = getPrefix();
163 
164         if (prefix == null)
165         {
166             return "[(DefaultFunctionCallExpr): " + getFunctionName() + "(" + getParameters() + ") ]";
167         }
168 
169         return "[(DefaultFunctionCallExpr): " + getPrefix() + ":" + getFunctionName() + "(" + getParameters() + ") ]";
170     }
171 
172     public Object evaluate(Context context) throws JaxenException
173     {
174         String namespaceURI =
175                 context.translateNamespacePrefixToUri(getPrefix());
176 
177         Function func = context.getFunction(namespaceURI,
178                 getPrefix(),
179                 getFunctionName());
180         List paramValues = evaluateParams(context);
181 
182         return func.call(context, paramValues);
183     }
184 
185     public List evaluateParams(Context context) throws JaxenException
186     {
187         List paramExprs = getParameters();
188         int paramSize = paramExprs.size();
189 
190         List paramValues = new ArrayList(paramSize);
191 
192         for (int i = 0; i < paramSize; ++i)
193         {
194             Expr eachParam = (Expr) paramExprs.get(i);
195 
196             Object eachValue = eachParam.evaluate(context);
197 
198             paramValues.add(eachValue);
199         }
200         return paramValues;
201     }
202 
203     public void accept(Visitor visitor)
204     {
205         visitor.visit(this);
206     }
207 }
208