cvs commit: jakarta-commons/betwixt/src/java/org/apache/commons/betwixt/strategy ValueSuppressionStrategy.java

[rd...@apache.org]

rdonkin     2004/08/23 12:36:35

  Added:       betwixt/src/java/org/apache/commons/betwixt/strategy
                        ValueSuppressionStrategy.java
  Log:
  Added strategy for attribute suppression. This should (belatedly) give a solution for issue #24659.
  
  Revision  Changes    Path
  1.1                  jakarta-commons/betwixt/src/java/org/apache/commons/betwixt/strategy/ValueSuppressionStrategy.java
  
  Index: ValueSuppressionStrategy.java
  ===================================================================
  /*
   * Copyright 2004 The Apache Software Foundation.
   * 
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   * 
   *      http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */ 
  package org.apache.commons.betwixt.strategy;
  
  import org.apache.commons.betwixt.AttributeDescriptor;
  
  /**
   * Determines whether the expression of an attribute with a values 
   * should be suppressed.
   * 
   * @author <a href='http://jakarta.apache.org/commons'>Jakarta Commons Team</a>, <a href='http://www.apache.org'>Apache Software Foundation</a>
   */
  public abstract class ValueSuppressionStrategy {
      
      /**
       * Strategy allows all values to be expressed for all attributes
       */
      public static final ValueSuppressionStrategy ALLOW_ALL_VALUES = new ValueSuppressionStrategy() {
          public boolean suppressAttribute(AttributeDescriptor attributeDescriptor, String value) {
              return true;
          }
      };
  
      /**
       * Suppresses all null values.
       */
      public static final ValueSuppressionStrategy SUPPRESS_EMPTY = new ValueSuppressionStrategy() {
          public boolean suppressAttribute(AttributeDescriptor attributeDescriptor, String value) {
              return "".equals(value);
          } 
      };
      
      /**
       * Default strategy is {@link #SUPPRESS_EMPTY}.
       */
      public static final ValueSuppressionStrategy DEFAULT = SUPPRESS_EMPTY;
  
      
      /**
       * Should the given attribute value be suppressed?
       * @param attributeDescriptor <code>AttributeDescriptor</code> describing the attribute, not null
       * @param value <code>Object</code> value, possibly null
       * @return true if the attribute should not be written for the given value
       */
      public abstract boolean suppressAttribute(AttributeDescriptor attributeDescriptor, String value);
  
  }
  
  
  

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