Clover coverage report - Code Coverage for tapestry release 3.1-alpha-1
Coverage timestamp: Mon Feb 21 2005 09:16:14 EST
file stats: LOC: 186   Methods: 7
NCLOC: 94   Classes: 1
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 Source file Conditionals Statements Methods TOTAL
Select.java 86.4% 95.5% 100% 93.2%
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   
 import org.apache.tapestry.request.RequestContext;
 26   
 
 27   
 /**
 28   
  *  Implements a component that manages an HTML <select> form element.
 29   
  *  The most common situation, using a <select> to set a specific
 30   
  *  property of some object, is best handled using a {@link PropertySelection} component.
 31   
  *
 32   
  *  [<a href="../../../../../ComponentReference/Select.html">Component Reference</a>]
 33   
  * 
 34   
  *  <p>Otherwise, this component is very similar to {@link RadioGroup}.
 35   
  *
 36   
  *
 37   
  *  @author Howard Lewis Ship
 38   
  * 
 39   
  **/
 40   
 
 41   
 public abstract class Select extends AbstractFormComponent
 42   
 {
 43   
     private boolean _rewinding;
 44   
     private boolean _rendering;
 45   
 
 46   
     private Set _selections;
 47   
     private int _nextOptionId;
 48   
 
 49   
     /**
 50   
      *  Used by the <code>Select</code> to record itself as a
 51   
      *  {@link IRequestCycle} attribute, so that the
 52   
      *  {@link Option} components it wraps can have access to it.
 53   
      *
 54   
      **/
 55   
 
 56   
     private final static String ATTRIBUTE_NAME = "org.apache.tapestry.active.Select";
 57   
 
 58  37
     public static Select get(IRequestCycle cycle)
 59   
     {
 60  37
         return (Select) cycle.getAttribute(ATTRIBUTE_NAME);
 61   
     }
 62   
 
 63   
     public abstract boolean isDisabled();
 64   
 
 65   
     public abstract boolean isMultiple();
 66   
 
 67  36
     public boolean isRewinding()
 68   
     {
 69  36
         if (!_rendering)
 70  0
             throw Tapestry.createRenderOnlyPropertyException(this, "rewinding");
 71   
 
 72  36
         return _rewinding;
 73   
     }
 74   
 
 75  36
     public String getNextOptionId()
 76   
     {
 77  36
         if (!_rendering)
 78  0
             throw Tapestry.createRenderOnlyPropertyException(this, "nextOptionId");
 79   
 
 80   
         // Return it as a hex value.
 81   
 
 82  36
         return Integer.toString(_nextOptionId++);
 83   
     }
 84   
 
 85  11
     public boolean isSelected(String value)
 86   
     {
 87  11
         if (_selections == null)
 88  3
             return false;
 89   
 
 90  8
         return _selections.contains(value);
 91   
     }
 92   
 
 93   
     /**
 94   
      *  Renders the &lt;option&gt; element, or responds when the form containing the element
 95   
      *  is submitted (by checking {@link IForm#isRewinding()}.
 96   
      **/
 97   
 
 98  16
     protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
 99   
     {
 100  16
         IForm form = getForm(cycle);
 101   
 
 102  15
         if (cycle.getAttribute(ATTRIBUTE_NAME) != null)
 103  1
             throw new ApplicationRuntimeException(
 104   
                 Tapestry.getMessage("Select.may-not-nest"),
 105   
                 this,
 106   
                 null,
 107   
                 null);
 108   
 
 109   
         // It isn't enough to know whether the cycle in general is rewinding, need to know
 110   
         // specifically if the form which contains this component is rewinding.
 111   
 
 112  14
         _rewinding = form.isRewinding();
 113   
 
 114   
         // Used whether rewinding or not.
 115   
 
 116  14
         String name = form.getElementId(this);
 117   
 
 118  14
         cycle.setAttribute(ATTRIBUTE_NAME, this);
 119   
 
 120  14
         if (_rewinding)
 121   
         {
 122  5
             _selections = buildSelections(cycle, name);
 123   
         }
 124   
         else
 125   
         {
 126  9
             writer.begin("select");
 127   
 
 128  9
             writer.attribute("name", name);
 129   
 
 130  9
             if (isMultiple())
 131  4
                 writer.attribute("multiple", "multiple");
 132   
 
 133  9
             if (isDisabled())
 134  1
                 writer.attribute("disabled", "disabled");
 135   
 
 136  9
             renderInformalParameters(writer, cycle);
 137   
         }
 138   
 
 139  14
         _rendering = true;
 140  14
         _nextOptionId = 0;
 141   
 
 142  14
         renderBody(writer, cycle);
 143   
 
 144  13
         if (!_rewinding)
 145   
         {
 146  8
             writer.end();
 147   
         }
 148   
 
 149  13
         cycle.removeAttribute(ATTRIBUTE_NAME);
 150   
 
 151   
     }
 152   
 
 153  16
     protected void cleanupAfterRender(IRequestCycle cycle)
 154   
     {
 155  16
         _rendering = false;
 156  16
         _selections = null;
 157   
 
 158  16
         super.cleanupAfterRender(cycle);
 159   
     }
 160   
 
 161   
     /**
 162   
      *  Cut-and-paste with {@link RadioGroup}!
 163   
      *
 164   
      **/
 165   
 
 166  5
     private Set buildSelections(IRequestCycle cycle, String parameterName)
 167   
     {
 168  5
         RequestContext context = cycle.getRequestContext();
 169   
 
 170  5
         String[] parameters = context.getParameters(parameterName);
 171   
 
 172  5
         if (parameters == null)
 173  1
             return null;
 174   
 
 175  4
         int length = parameters.length;
 176   
 
 177  4
         int size = (parameters.length > 30) ? 101 : 7;
 178   
 
 179  4
         Set result = new HashSet(size);
 180   
 
 181  4
         for (int i = 0; i < length; i++)
 182  6
             result.add(parameters[i]);
 183   
 
 184  4
         return result;
 185   
     }
 186   
 }