Examples of java.beans.BeanInfo

java.beans.BeanInfo
A bean implementor who wishes to provide explicit information about their bean may provide a BeanInfo class that implements this BeanInfo interface and provides explicit information about the methods, properties, events, etc, of their bean.
A bean implementor doesn't need to provide a complete set of explicit information. You can pick and choose which information you want to provide and the rest will be obtained by automatic analysis using low-level reflection of the bean classes' methods and applying standard design patterns.
You get the opportunity to provide lots and lots of different information as part of the various XyZDescriptor classes. But don't panic, you only really need to provide the minimal core information required by the various constructors.
See also the SimpleBeanInfo class which provides a convenient "noop" base class for BeanInfo classes, which you can override for those specific places where you want to return explicit info.
To learn about all the behaviour of a bean see the Introspector class.

   * @param classifier the classifier to get the global info for
   * @return the global info (synopsis) for the classifier
   * @throws Exception if there is a problem reflecting on the classifier
   */
  protected static String getGlobalInfo(Classifier classifier) throws Exception {
    BeanInfo bi = Introspector.getBeanInfo(classifier.getClass());
    MethodDescriptor[] methods;
    methods = bi.getMethodDescriptors();
    Object[] args = {};
    String result = "\nSynopsis for " + classifier.getClass().getName()
      + ":\n\n";


    for (int i = 0; i < methods.length; i++) {

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    scrollablePanel.setLayout(gbLayout);
    setVisible(false);
    m_NumEditable = 0;
    m_Target = targ;
    try {
      BeanInfo bi = Introspector.getBeanInfo(m_Target.getClass());
      m_Properties = bi.getPropertyDescriptors();
      m_Methods = bi.getMethodDescriptors();
    } catch (IntrospectionException ex) {
      System.err.println("PropertySheet: Couldn't introspect");
      return;
    }

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   * @return the generated BeanConnection
   * @throws Exception if something goes wrong
   */
  protected BeanConnection createBeanConnection(int sourcePos, int targetPos, String event, boolean hidden) throws Exception {
    BeanConnection          result;
    BeanInfo                compInfo;
    EventSetDescriptor[]    esds;
    int                     i;
    BeanInstance            instSource;
    BeanInstance            instTarget;


    result = null;
    
    // was there a connection?
    if ( (sourcePos == -1) || (targetPos == -1) )
      return result;
    
    instSource = (BeanInstance) m_BeanInstances.get(sourcePos);
    instTarget = (BeanInstance) m_BeanInstances.get(targetPos);
    
    compInfo = Introspector.getBeanInfo(((BeanInstance) m_BeanInstances.get(sourcePos)).getBean().getClass());
    esds     = compInfo.getEventSetDescriptors();


    for (i = 0; i < esds.length; i++) {
      if (esds[i].getName().equals(event)) {
        result = new BeanConnection(instSource, instTarget, esds[i], m_vectorIndex);
        ((BeanConnection) result).setHidden(hidden);

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   */
  public static String getGlobalInfo(Object tempBean) {
    // set tool tip text from global info if supplied
    String gi = null;
    try {
      BeanInfo bi = Introspector.getBeanInfo(tempBean.getClass());
      MethodDescriptor [] methods = bi.getMethodDescriptors();
      for (int i = 0; i < methods.length; i++) {
        String name = methods[i].getDisplayName();
        Method meth = methods[i].getMethod();
        if (name.equals("globalInfo")) {
          if (meth.getReturnType().equals(String.class)) {

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  {
    try
    {
      this.properties = new HashMap();


      final BeanInfo bi = Introspector.getBeanInfo(className);
      final PropertyDescriptor[] propertyDescriptors
          = bi.getPropertyDescriptors();
      for (int i = 0; i < propertyDescriptors.length; i++)
      {
        final PropertyDescriptor propertyDescriptor = propertyDescriptors[i];
        final Method readMethod = propertyDescriptor.getReadMethod();
        final Method writeMethod = propertyDescriptor.getWriteMethod();

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        logger.warn("Expression '" + expression.getExpressionType() + " is null");
      }


      try
      {
        final BeanInfo beanInfo = expression.getBeanDescriptor();
        if (beanInfo == null)
        {
          logger.warn("Expression '" + expression.getExpressionType() + ": Cannot get BeanDescriptor: Null");
        }
      }
      catch (IntrospectionException e)
      {
        logger.warn("Expression '" + expression.getExpressionType() + ": Cannot get BeanDescriptor", e);
      }


      final Locale locale = Locale.getDefault();
      final String displayName = expression.getDisplayName(locale);
      if (isValid(displayName, expression.getName()) == false)
      {
        logger.warn("Expression '" + expression.getExpressionType() + ": No valid display name");
      }
      if (expression.isDeprecated())
      {
        deprecatedExpressionsCounter += 1;
        final String deprecateMessage = expression.getDeprecationMessage(locale);
        if (isValid(deprecateMessage, "Use a Formula instead") == false)
        {
          logger.warn("Expression '" + expression.getExpressionType() + ": No valid deprecate message");
        }
      }
      final String grouping = expression.getGrouping(locale);
      if (isValid(grouping, "Group") == false)
      {
        logger.warn("Expression '" + expression.getExpressionType() + ": No valid grouping message");
      }


      expressionsByGroup.add(grouping, expression);


      final ExpressionPropertyMetaData[] properties = expression.getPropertyDescriptions();
      for (int j = 0; j < properties.length; j++)
      {
        final ExpressionPropertyMetaData propertyMetaData = properties[j];
        final String name = propertyMetaData.getName();
        if (StringUtils.isEmpty(name))
        {
          logger.warn("Expression '" + expression.getExpressionType() + ": Property without a name");
        }
        final String propertyDisplayName = propertyMetaData.getDisplayName(locale);
        if (isValid(propertyDisplayName, name) == false)
        {
          logger.warn("Expression '" + expression.getExpressionType() + ": Property " + propertyMetaData.getName() + ": No DisplayName");
        }


        final String propertyGrouping = propertyMetaData.getGrouping(locale);
        if (isValid(propertyGrouping, "Group") == false)
        {
          logger.warn("Expression '" + expression.getExpressionType() + ": Property " + propertyMetaData.getName() + ": Grouping is not valid");
        }
        final int groupingOrdinal = propertyMetaData.getGroupingOrdinal(locale);
        if (groupingOrdinal == Integer.MAX_VALUE)
        {
          if (propertyMetaData instanceof DefaultExpressionMetaData)
          {
            final DefaultExpressionPropertyMetaData demd = (DefaultExpressionPropertyMetaData) propertyMetaData;
            missingProperties.add(demd.getKeyPrefix() + "grouping.ordinal=1000");
          }
          logger.warn("Expression '" + expression.getExpressionType() + ": Property " + propertyMetaData.getName() + ": Grouping ordinal is not valid");
        }
        final int ordinal = propertyMetaData.getItemOrdinal(locale);
        if (groupingOrdinal == Integer.MAX_VALUE)
        {
          if (propertyMetaData instanceof DefaultExpressionMetaData)
          {
            final DefaultExpressionPropertyMetaData demd = (DefaultExpressionPropertyMetaData) propertyMetaData;
            missingProperties.add(demd.getKeyPrefix() + "ordinal=1000");
          }
          logger.warn("Expression '" + expression.getExpressionType() + ": Property " + propertyMetaData.getName() + ": Ordinal is not valid");
        }
        final String propertyDescription = propertyMetaData.getDescription(locale);
        if (isValid(propertyDescription, "") == false)
        {
          logger.warn("Expression '" + expression.getExpressionType() + ": Property " + propertyMetaData.getName() + ": Description is not valid");
        }
        final String propertyDeprecated = propertyMetaData.getDeprecationMessage(locale);
        if (isValid(propertyDeprecated, "") == false)
        {
          logger.warn("Expression '" + expression.getExpressionType() + ": Property " + propertyMetaData.getName() + ": Deprecation is not valid");
        }


        final String role = propertyMetaData.getPropertyRole();
        if (isValid(role, "Value") == false)
        {
          logger.warn("Expression '" + expression.getExpressionType() + ": Property " + propertyMetaData.getName() + ": Role is not valid");
        }
        final Class propertyType = propertyMetaData.getPropertyType();
        if (propertyType == null)
        {
          logger.warn("Expression '" + expression.getExpressionType() + ": Property " + propertyMetaData.getName() + ": Property Type is not valid");
        }


        // should not crash!
        final PropertyDescriptor propertyDescriptor = propertyMetaData.getBeanDescriptor();


        if (propertyMetaData.isDeprecated())
        {
          final String deprecateMessage = propertyMetaData.getDeprecationMessage(locale);
          if (isValid(deprecateMessage, "Deprecated") == false)
          {
            logger.warn("Expression '" + expression.getExpressionType() + ": Property " + propertyMetaData.getName() + ": No valid deprecate message");
          }
        }


      }


      try
      {
        final BeanInfo beanInfo = Introspector.getBeanInfo(expression.getExpressionType());
        final PropertyDescriptor[] descriptors = beanInfo.getPropertyDescriptors();
        for (int propIdx = 0; propIdx < descriptors.length; propIdx++)
        {
          final PropertyDescriptor descriptor = descriptors[propIdx];
          final String key = descriptor.getName();

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      expressionAttrList.setAttribute(META_NAMESPACE, "expert", "false");
      expressionAttrList.setAttribute(META_NAMESPACE, "hidden", "false");
      expressionAttrList.setAttribute(META_NAMESPACE, "preferred", "false");
      writer.writeTag(META_NAMESPACE, "expression", expressionAttrList, XmlWriter.OPEN);


      final BeanInfo beanInfo = Introspector.getBeanInfo(aClass);
      final PropertyDescriptor[] descriptors = beanInfo.getPropertyDescriptors();
      for (int j = 0; j < descriptors.length; j++)
      {
        final PropertyDescriptor descriptor = descriptors[j];
        final String key = descriptor.getName();

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    for (int i = 0; i < classes.length; i++)
    {
      final Class aClass = classes[i];


      final BeanInfo beanInfo = Introspector.getBeanInfo(aClass);
      final BeanUtility bu = new BeanUtility(aClass.newInstance());
      final PropertyDescriptor[] descriptors = beanInfo.getPropertyDescriptors();
      for (int j = 0; j < descriptors.length; j++)
      {
        final PropertyDescriptor descriptor = descriptors[j];
        final String key = descriptor.getName();

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            }
        }


        for (int i = 0; i < ji.getCount(); i++) {
            String beanName = ji.getName(i);
            BeanInfo bi = ji.getBeanInfo(i);
            Class bc = ji.getBeanClass(i);
            if (bi == null || bc == null) {
                // We couldn't load the bean.
                continue;
            }

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     * Utility method to obtain the BeanInfo object associated with a
     * bean class that the BeanBox knows about. Returns a null if none
     * found.
     */
    public BeanInfo getBeanInfoForBean(String beanClassName) {
        BeanInfo beanInfo = (BeanInfo) beanInfoMap.get(beanClassName);
        if (beanInfo == null) {
            beanInfo = BeanPanel.findBeanInfo(beanClassName);
            if (beanInfo != null)
                beanInfoMap.put(beanClassName, beanInfo);
        }

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