Clover coverage report - Code Coverage for tapestry release 4.0-alpha-3
Coverage timestamp: Mon May 16 2005 09:05:49 EDT
file stats: LOC: 179   Methods: 7
NCLOC: 91   Classes: 1
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 Source file Conditionals Statements Methods TOTAL
Select.java 83.3% 93.3% 100% 90.8%
coverage coverage
 1   
 // Copyright 2004, 2005 The Apache Software Foundation
 2   
 //
 3   
 // Licensed under the Apache License, Version 2.0 (the "License");
 4   
 // you may not use this file except in compliance with the License.
 5   
 // You may obtain a copy of the License at
 6   
 //
 7   
 //     http://www.apache.org/licenses/LICENSE-2.0
 8   
 //
 9   
 // Unless required by applicable law or agreed to in writing, software
 10   
 // distributed under the License is distributed on an "AS IS" BASIS,
 11   
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 12   
 // See the License for the specific language governing permissions and
 13   
 // limitations under the License.
 14   
 
 15   
 package org.apache.tapestry.form;
 16   
 
 17   
 import java.util.HashSet;
 18   
 import java.util.Set;
 19   
 
 20   
 import org.apache.hivemind.ApplicationRuntimeException;
 21   
 import org.apache.tapestry.IForm;
 22   
 import org.apache.tapestry.IMarkupWriter;
 23   
 import org.apache.tapestry.IRequestCycle;
 24   
 import org.apache.tapestry.Tapestry;
 25   
 
 26   
 /**
 27   
  * Implements a component that manages an HTML <select> form element. The most common
 28   
  * situation, using a <select> to set a specific property of some object, is best handled
 29   
  * using a {@link PropertySelection}component. [ <a
 30   
  * href="../../../../../ComponentReference/Select.html">Component Reference </a>]
 31   
  * <p>
 32   
  * Otherwise, this component is very similar to {@link RadioGroup}.
 33   
  * 
 34   
  * @author Howard Lewis Ship
 35   
  */
 36   
 
 37   
 public abstract class Select extends AbstractFormComponent
 38   
 {
 39   
     private boolean _rewinding;
 40   
 
 41   
     private boolean _rendering;
 42   
 
 43   
     private Set _selections;
 44   
 
 45   
     private int _nextOptionId;
 46   
 
 47   
     /**
 48   
      * Used by the <code>Select</code> to record itself as a {@link IRequestCycle}attribute, so
 49   
      * that the {@link Option}components it wraps can have access to it.
 50   
      */
 51   
 
 52   
     private final static String ATTRIBUTE_NAME = "org.apache.tapestry.active.Select";
 53   
 
 54  37
     public static Select get(IRequestCycle cycle)
 55   
     {
 56  37
         return (Select) cycle.getAttribute(ATTRIBUTE_NAME);
 57   
     }
 58   
 
 59   
     public abstract boolean isDisabled();
 60   
 
 61   
     public abstract boolean isMultiple();
 62   
 
 63  36
     public boolean isRewinding()
 64   
     {
 65  36
         if (!_rendering)
 66  0
             throw Tapestry.createRenderOnlyPropertyException(this, "rewinding");
 67   
 
 68  36
         return _rewinding;
 69   
     }
 70   
 
 71  36
     public String getNextOptionId()
 72   
     {
 73  36
         if (!_rendering)
 74  0
             throw Tapestry.createRenderOnlyPropertyException(this, "nextOptionId");
 75   
 
 76   
         // Return it as a hex value.
 77   
 
 78  36
         return Integer.toString(_nextOptionId++);
 79   
     }
 80   
 
 81  11
     public boolean isSelected(String value)
 82   
     {
 83  11
         if (_selections == null)
 84  3
             return false;
 85   
 
 86  8
         return _selections.contains(value);
 87   
     }
 88   
 
 89   
     /**
 90   
      * Renders the &lt;option&gt; element, or responds when the form containing the element is
 91   
      * submitted (by checking {@link IForm#isRewinding()}.
 92   
      */
 93   
 
 94  15
     protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
 95   
     {
 96  15
         IForm form = getForm(cycle);
 97   
 
 98  15
         if (form.wasPrerendered(writer, this))
 99  0
             return;
 100   
 
 101  15
         if (cycle.getAttribute(ATTRIBUTE_NAME) != null)
 102  1
             throw new ApplicationRuntimeException(Tapestry.getMessage("Select.may-not-nest"), this,
 103   
                     null, null);
 104   
 
 105   
         // It isn't enough to know whether the cycle in general is rewinding, need to know
 106   
         // specifically if the form which contains this component is rewinding.
 107   
 
 108  14
         _rewinding = form.isRewinding();
 109   
 
 110   
         // Used whether rewinding or not.
 111   
 
 112  14
         String name = form.getElementId(this);
 113   
 
 114  14
         cycle.setAttribute(ATTRIBUTE_NAME, this);
 115   
 
 116  14
         if (_rewinding)
 117   
         {
 118  5
             _selections = buildSelections(cycle, name);
 119   
         }
 120   
         else
 121   
         {
 122  9
             writer.begin("select");
 123   
 
 124  9
             writer.attribute("name", name);
 125   
 
 126  9
             if (isMultiple())
 127  4
                 writer.attribute("multiple", "multiple");
 128   
 
 129  9
             if (isDisabled())
 130  1
                 writer.attribute("disabled", "disabled");
 131   
 
 132  9
             renderInformalParameters(writer, cycle);
 133   
         }
 134   
 
 135  14
         _rendering = true;
 136  14
         _nextOptionId = 0;
 137   
 
 138  14
         renderBody(writer, cycle);
 139   
 
 140  13
         if (!_rewinding)
 141   
         {
 142  8
             writer.end();
 143   
         }
 144   
 
 145  13
         cycle.removeAttribute(ATTRIBUTE_NAME);
 146   
 
 147   
     }
 148   
 
 149  15
     protected void cleanupAfterRender(IRequestCycle cycle)
 150   
     {
 151  15
         _rendering = false;
 152  15
         _selections = null;
 153   
 
 154  15
         super.cleanupAfterRender(cycle);
 155   
     }
 156   
 
 157   
     /**
 158   
      * Cut-and-paste with {@link RadioGroup}!
 159   
      */
 160   
 
 161  5
     private Set buildSelections(IRequestCycle cycle, String parameterName)
 162   
     {
 163  5
         String[] parameters = cycle.getParameters(parameterName);
 164   
 
 165  5
         if (parameters == null)
 166  1
             return null;
 167   
 
 168  4
         int length = parameters.length;
 169   
 
 170  4
         int size = (parameters.length > 30) ? 101 : 7;
 171   
 
 172  4
         Set result = new HashSet(size);
 173   
 
 174  4
         for (int i = 0; i < length; i++)
 175  6
             result.add(parameters[i]);
 176   
 
 177  4
         return result;
 178   
     }
 179   
 }