Coverage report

  %line %branch
org.apache.commons.jelly.tags.swing.GbcTag
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 1   
 /*
 2   
  * Copyright 2002,2004 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   
 package org.apache.commons.jelly.tags.swing;
 17   
 
 18   
 import java.awt.Component;
 19   
 import java.awt.GridBagConstraints;
 20   
 import java.awt.Insets;
 21   
 import java.util.Map;
 22   
 
 23   
 import org.apache.commons.jelly.JellyTagException;
 24   
 import org.apache.commons.jelly.MissingAttributeException;
 25   
 import org.apache.commons.jelly.Tag;
 26   
 import org.apache.commons.jelly.XMLOutput;
 27   
 import org.apache.commons.jelly.tags.core.UseBeanTag;
 28   
 import org.apache.commons.jelly.tags.swing.impl.GridBagConstraintBean;
 29   
 import org.apache.commons.lang.StringUtils;
 30   
 
 31   
 /**
 32   
  * This class represents a {@link GridBagConstraints} constraints as passed in
 33   
  * the second argument of {@link Container#add(Component,Object)}.
 34   
  * It supports inheritence between such tags in the following fashion:
 35   
  * <ul>
 36   
  *     <li>either using a <code>basedOn</code> attribute which is
 37   
  *         supposed to provide a reference to another {@link GbcTag}.</li>
 38   
  *     <li>either using a parent {@link GbcTag}.</li>
 39   
  * </ul>
 40   
  * The first version takes precedence.
 41   
  * A Grid-bag-constraint inherits from another simply by setting other attributes
 42   
  * as is done in {@link GridBagConstraintBean#setBasedOn}.
 43   
  * <p>
 44   
  * In essence, it looks really like nothing else than a bean-class...
 45   
  * with {@link #getConstraints}.
 46   
  * Probably a shorter java-source is do-able.
 47   
  * <p>
 48   
  * TODO: this class should probably be extended with special treatment for dimensions
 49   
  * using the converter package.
 50   
  *
 51   
  * @author <a href="mailto:paul@activemath.org">Paul Libbrecht</a>
 52   
  * @version $Revision: 155420 $
 53   
  */
 54  0 
 public class GbcTag extends UseBeanTag implements ContainerTag {
 55   
 
 56   
     public GridBagConstraints getConstraints() {
 57  0 
         return (GridBagConstraints) getBean();
 58   
     }
 59   
 
 60   
 
 61   
     // ContainerTag interface
 62   
     //-------------------------------------------------------------------------
 63   
 
 64   
     /**
 65   
      * Adds a child component to this parent
 66   
      * @param component the child to add
 67   
      * @param constraints the constraints to use
 68   
      * @TODO constraints looks like it's ignored
 69   
      */
 70   
     public void addChild(Component component, Object constraints) throws JellyTagException {
 71  0 
         GridBagLayoutTag tag = (GridBagLayoutTag) findAncestorWithClass( GridBagLayoutTag.class );
 72  0 
         if (tag == null) {
 73  0 
             throw new JellyTagException( "this tag must be nested within a <gridBagLayout> tag" );
 74   
         }
 75  0 
         tag.addLayoutComponent(component, getConstraints());
 76  0 
     }
 77   
 
 78   
     // Implementation methods
 79   
     //-------------------------------------------------------------------------
 80   
 
 81   
     /**
 82   
      * A class may be specified otherwise the Factory will be used.
 83   
      * @param classObject the object to be converted
 84   
      */
 85   
     protected Class convertToClass(Object classObject)
 86   
     throws MissingAttributeException, ClassNotFoundException {
 87  0 
         if (classObject == null) {
 88  0 
             return null;
 89   
         }
 90   
         else {
 91  0 
             return super.convertToClass(classObject);
 92   
         }
 93   
     }
 94   
 
 95   
     /**
 96   
      * A class may be specified otherwise the Factory will be used.
 97   
      */
 98   
     protected Object newInstance(Class theClass, Map attributes, XMLOutput output) throws JellyTagException {
 99  0 
         if (theClass != null ) {
 100   
             try {
 101  0 
                 return theClass.newInstance();
 102  0 
             } catch (IllegalAccessException e) {
 103  0 
                 throw new JellyTagException(e);
 104  0 
             } catch (InstantiationException e) {
 105  0 
                 throw new JellyTagException(e);
 106   
             }
 107   
         }
 108   
         else {
 109  0 
             return new GridBagConstraintBean();
 110   
         }
 111   
     }
 112   
 
 113   
     protected void setBeanProperties(Object bean, Map attributes)
 114   
         throws JellyTagException {
 115   
 
 116  0 
         Insets ins = null;
 117  0 
         Object insetString = attributes.get("insets");
 118  0 
         if (insetString instanceof String) {
 119  0 
             attributes.remove("insets");
 120   
 
 121   
 
 122  0 
             String[] parts = StringUtils.split((String) insetString, ",");
 123   
 
 124  0 
             if (parts.length != 4) {
 125  0 
                 throw new JellyTagException(
 126   
                     "insets must be specified"
 127   
                         + "as four comma - separated integers.");
 128   
             }
 129   
 
 130  0 
             ins =
 131   
                 new Insets(
 132   
                     Integer.parseInt(parts[0].trim()),
 133   
                     Integer.parseInt(parts[1].trim()),
 134   
                     Integer.parseInt(parts[2].trim()),
 135   
                     Integer.parseInt(parts[3].trim()));
 136   
         }
 137   
 
 138  0 
         super.setBeanProperties(bean, attributes);
 139   
 
 140   
         // set basedOn info of the bean if we have a parent gbc tag
 141   
         // in the context of the closest gridbaglayout tag
 142   
 
 143  0 
         if (bean instanceof GridBagConstraintBean) {
 144  0 
             GridBagConstraintBean gbc = (GridBagConstraintBean) bean;
 145   
 
 146  0 
             if (ins != null) {
 147  0 
                 gbc.setInsets(ins);
 148   
             }
 149   
 
 150  0 
             GridBagLayoutTag parentLayoutTag =
 151   
                 (GridBagLayoutTag) (findAncestorWithClass(GridBagLayoutTag
 152   
                     .class));
 153  0 
             if (parentLayoutTag != null) {
 154  0 
                 GbcTag parentGbcTag =
 155   
                     (GbcTag) (findAncestorWithClass(getParent(),
 156   
                         GbcTag.class,
 157   
                         parentLayoutTag));
 158  0 
                 if (parentGbcTag != null) {
 159  0 
                     GridBagConstraints parentGbc =
 160   
                         parentGbcTag.getConstraints();
 161   
 
 162  0 
                     if (parentGbc != null
 163   
                         && parentGbc instanceof GridBagConstraintBean) {
 164  0 
                         gbc.setBasedOn((GridBagConstraintBean) parentGbc);
 165  0 
                         if (insetString == null) {
 166  0 
                             gbc.setInsets(parentGbc.insets);
 167   
                         }
 168   
                     }
 169   
                 }
 170   
             }
 171   
         }
 172  0 
     }
 173   
 
 174   
     public static Tag findAncestorWithClass(
 175   
         Tag from,
 176   
         Class tagClass,
 177   
         Tag parent) {
 178  0 
         while (from != null && from != parent) {
 179  0 
             if (tagClass.isInstance(from)) {
 180  0 
                 return from;
 181   
             }
 182  0 
             from = from.getParent();
 183   
         }
 184  0 
         return null;
 185   
     }
 186   
 }
 187   
 

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