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    1   /*
    2    * Copyright 2000-2001,2004 The Apache Software Foundation.
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    *      http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16
    17  package org.apache.commons.jexl.util;
    18
    19  import org.apache.commons.logging.Log;
    20  /***
    21   *  Handles discovery and valuation of a
    22   *  boolean object property, of the
    23   *  form public boolean is&lt;Property&gt; when executed.
    24   *
    25   *  We do this separately as to preserve the current
    26   *  quasi-broken semantics of get &lt;as is property&gt;
    27   *  get&lt;flip 1st char&gt; get("property") and now followed
    28   *  by is&lt;Property&gt;.
    29   *
    30   *  @since 1.0
    31   *  @author <a href="geirm@apache.org">Geir Magnusson Jr.</a>
    32   *  @version $Id: BooleanPropertyExecutor.java 398171 2006-04-29 14:57:29Z dion $
    33   */
    34  public class BooleanPropertyExecutor extends PropertyExecutor {
    35
    36      /***
    37       * Constructor.
    38       *
    39       * @param rlog The instance log.
    40       * @param is The JEXL introspector.
    41       * @param clazz The class being analyzed.
    42       * @param property The boolean property.
    43       */
    44      public BooleanPropertyExecutor(Log rlog,
    45          org.apache.commons.jexl.util.introspection.Introspector is,
    46          Class clazz, String property) {
    47              super(rlog, is, clazz, property);
    48      }
    49
    50      /***
    51       * Locate the getter method for this boolean property.
    52       *
    53       * @param clazz The class being analyzed.
    54       * @param property Name of boolean property.
    55       */
    56      protected void discover(Class clazz, String property) {
    57          try {
    58              char c;
    59              StringBuffer sb;
    60
    61              Object[] params = {};
    62
    63              /*
    64               *  now look for a boolean isFoo
    65               */
    66
    67              sb = new StringBuffer("is");
    68              sb.append(property);
    69
    70              c = sb.charAt(2);
    71
    72              if (Character.isLowerCase(c)) {
    73                  sb.setCharAt(2, Character.toUpperCase(c));
    74              }
    75
    76              methodUsed = sb.toString();
    77              method = introspector.getMethod(clazz, methodUsed, params);
    78
    79              if (method != null) {
    80                  /*
    81                   *  now, this has to return a boolean
    82                   */
    83
    84                  if (method.getReturnType() == Boolean.TYPE) {
    85                      return;
    86                  }
    87
    88                  method = null;
    89              }
    90          } catch (Exception e) {
    91              rlog.error("PROGRAMMER ERROR : BooleanPropertyExector() : " + e);
    92          }
    93      }
    94  }