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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