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    1   /*
    2    * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/DefaultPathExpr.java,v 1.12 2005/06/28 13:44:44 elharo Exp $
    3    * $Revision: 1.12 $
    4    * $Date: 2005/06/28 13:44:44 $
    5    *
    6    * ====================================================================
    7    *
    8    * Copyright (C) 2000-2002 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: DefaultPathExpr.java,v 1.12 2005/06/28 13:44:44 elharo Exp $
    60   */
    61
    62  package org.jaxen.expr;
    63
    64
    65  import org.jaxen.Context;
    66  import org.jaxen.JaxenException;
    67
    68
    69  class DefaultPathExpr extends DefaultExpr implements PathExpr {
    70
    71      private Expr filterExpr;
    72      private LocationPath locationPath;
    73
    74      DefaultPathExpr(Expr filterExpr,
    75                             LocationPath locationPath) {
    76          this.filterExpr = filterExpr;
    77          this.locationPath = locationPath;
    78      }
    79
    80      public Expr getFilterExpr() {
    81          return this.filterExpr;
    82      }
    83
    84
    85      public void setFilterExpr(Expr filterExpr) {
    86          this.filterExpr = filterExpr;
    87      }
    88
    89
    90      public LocationPath getLocationPath() {
    91          return this.locationPath;
    92      }
    93
    94
    95      public String toString() {
    96          if (getLocationPath() != null) {
    97              return "[(DefaultPathExpr): " + getFilterExpr() + ", " + getLocationPath() + "]";
    98          }
    99
    100         return "[(DefaultPathExpr): " + getFilterExpr() + "]";
    101     }
    102
    103
    104     public String getText() {
    105         StringBuffer buf = new StringBuffer();
    106
    107         if (getFilterExpr() != null) {
    108             buf.append(getFilterExpr().getText());
    109         }
    110
    111         if (getLocationPath() != null) {
    112             buf.append(getLocationPath().getText());
    113         }
    114
    115         return buf.toString();
    116     }
    117
    118
    119     public Expr simplify() {
    120         if (getFilterExpr() != null) {
    121             setFilterExpr(getFilterExpr().simplify());
    122         }
    123
    124         if (getLocationPath() != null) {
    125             getLocationPath().simplify();
    126         }
    127
    128         if (getFilterExpr() == null && getLocationPath() == null) {
    129             return null;
    130         }
    131
    132
    133         if (getLocationPath() == null) {
    134             return getFilterExpr();
    135         }
    136
    137         if (getFilterExpr() == null) {
    138             return getLocationPath();
    139         }
    140
    141         return this;
    142     }
    143
    144     public Object evaluate(Context context) throws JaxenException {
    145         Object results = null;
    146         Context pathContext = null;
    147         if (getFilterExpr() != null) {
    148             results = getFilterExpr().evaluate(context);
    149             pathContext = new Context(context.getContextSupport());
    150             pathContext.setNodeSet(convertToList(results));
    151         }
    152         if (getLocationPath() != null) {
    153             return getLocationPath().evaluate(pathContext);
    154         }
    155         return results;
    156     }
    157
    158     public void accept(Visitor visitor) {
    159         visitor.visit(this);
    160     }
    161 }
    162