Examples of org.jdesktop.binding.metadata.MetaData

org.jdesktop.binding.metadata.MetaData
Class for representing the meta-data for an field in a data model. A "field" may map to a column on a RowSet, a property on a JavaBean, or some other discrete data element on a data model. The meta-data describes aspects of a data field such as it's name, type, and edit constraints. This class may be used when such information isn't encapsulated in the data model object itself and thus must be represented in an external object. Meta-data is intended only for holding state about a data model element and is not intended for implementing application semantics.

A meta-data object should be initialized at a minimum with a name, class, and label. Additional meta-data properties can be set as necessary. For example:
```
 MetaData metaData = new MetaData("firstname", String.class, "First Name"); metaData.setRequired(true); 
```
If the associated data model field requires application-specific validation logic to verify the correctness of a potential value, one or more Validator instances can be added to the meta-data object. Example:
```
 MetaData metaData = new MetaData("creditcard", String.class, "Credit Card Number" metaData.setRequired(true); metaData.addValidator(new MyCreditCardValidator()); 
```
@author Amy Fowler @author Rich Bair @version 1.0

        }
    }


    private MetaData createMetaData(PropertyDescriptor prop) {
        
        MetaData metaData = null;
        // JW: cannot cope with indexedPropertyTypes (?)
        // they seem to return null for getPropertyType
        if (Number.class.isAssignableFrom(prop.getPropertyType())) {
            metaData = new NumberMetaData(
                    prop.getName(),
                    prop.getPropertyType(),
                    prop.getDisplayName());
        } else if (isNumberType(prop))
        {
            // convert the primitive types to their boxed types
            // this makes the binding code happier in
            // AbstractBinding#convertToModelType
             metaData = new NumberMetaData(
                            prop.getName(),
                            primitivesToBoxed.get(prop.getPropertyType()),
                            prop.getDisplayName());
            // JW: really??
            metaData.setRequired(true);
        } else {
            Class type = prop.getPropertyType();
            if (primitivesToBoxed.get(type) != null) {
                type = primitivesToBoxed.get(type);
            }
            metaData = new MetaData(prop.getName(), type, prop
                                .getDisplayName());
                
        }
        return metaData;
    }

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    public abstract String[] getFieldNames();


    public MetaData[] getMetaData() {
        String fieldNames[] = getFieldNames();
        MetaData metaData[] = new MetaData[fieldNames.length];
        for(int i = 0; i < fieldNames.length; i++) {
            metaData[i] = getMetaData(fieldNames[i]);
        }
        return metaData;
    }

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        }
        
    }


    public Class getColumnClass(int columnIndex) {
        MetaData metaData = getMetaData(columnIndex);
        return metaData.getElementClass();
    }

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        //its possible that the meta data hasn't shown up yet. In this
        //case, use the field name until the meta data arrives
        // JW: when would that be the case?
//        MetaData md = dm.getMetaData(fieldNames[column]);
//        return md == null ? fieldNames[column] : md.getLabel();
        MetaData md = getMetaData(column);
        return md.getLabel();
    }

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        MetaData md = getMetaData(column);
        return md.getLabel();
    }
    
    public boolean isCellEditable(int rowIndex, int columnIndex) {
        MetaData md = getMetaData(columnIndex);
        return !md.isReadOnly();
    }

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        return cachedMetaData == null ? new MetaData[0] : cachedMetaData;
    }


    public MetaData getMetaData(String dataID) {
        if (cachedMetaData == null) {
            return new MetaData(dataID);
        }
        for (MetaData md : cachedMetaData) {
            if (md.getName().equals(dataID)) {
                return md;
            }

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        cachedMetaData = new MetaData[cols.size()];
        cachedFieldNames = new String[cachedMetaData.length];
        for (int i=0; i<cachedMetaData.length; i++) {
            DataColumn col = cols.get(i);
            //TODO if the column name changes, my cache is invalidated!!!
            cachedMetaData[i] = new MetaData(col.getName(), col.getType());
            cachedFieldNames[i] = col.getName();
        }
    }

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        }
    }


    public void configureTableColumn(MetaDataProvider provider,
            TableColumnExt column) {
        MetaData metaData = provider
                .getMetaData(provider.getFieldNames()[column.getModelIndex()]);
        column.setIdentifier(metaData.getName());
        column.setHeaderValue(metaData.getLabel());
        if (metaData.getElementClass() == String.class) {


            if (metaData.getDisplayWidth() > 0) {
                StringBuffer buf = new StringBuffer(metaData.getDisplayWidth());
                for (int i = 0; i < metaData.getDisplayWidth(); i++) {
                    buf.append("r");


                }
                column.setPrototypeValue(buf.toString());
            }
        } else if (metaData.getElementClass() == Number.class) {
            if (metaData.getDisplayWidth() > 0) {
                StringBuffer buf = new StringBuffer(metaData.getDisplayWidth());
                for (int i = 0; i < metaData.getDisplayWidth(); i++) {
                    buf.append("1");


                }
                column.setPrototypeValue(buf.toString());

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