Extension Point für FormFields

fields.exsd

<?xml version='1.0' encoding='UTF-8'?>
<!-- Schema file written by PDE -->
<schema targetNamespace="com.example.miniscout.client" xmlns="http://www.w3.org/2001/XMLSchema">
<annotation>
      <appinfo>
         <meta.schema plugin="com.example.miniscout.client" id="fields" name="Form Fields"/>
      </appinfo>
      <documentation>
         
      </documentation>
   </annotation>

   <element name="extension">
      <annotation>
         <appinfo>
            <meta.element />
         </appinfo>
      </annotation>
      <complexType>
         <sequence minOccurs="1" maxOccurs="unbounded">
            <element ref="Field"/>
         </sequence>
         <attribute name="point" type="string" use="required">
            <annotation>
               <documentation>
                  
               </documentation>
            </annotation>
         </attribute>
         <attribute name="id" type="string">
            <annotation>
               <documentation>
                  
               </documentation>
            </annotation>
         </attribute>
         <attribute name="name" type="string">
            <annotation>
               <documentation>
                  
               </documentation>
               <appinfo>
                  <meta.attribute translatable="true"/>
               </appinfo>
            </annotation>
         </attribute>
      </complexType>
   </element>

   <element name="Field">
      <complexType>
         <attribute name="name" type="string">
            <annotation>
               <documentation>
                  
               </documentation>
            </annotation>
         </attribute>
         <attribute name="class" type="string">
            <annotation>
               <documentation>
                  
               </documentation>
               <appinfo>
                  <meta.attribute kind="java" basedOn="com.example.miniscout.client.fields.FormField:"/>
               </appinfo>
            </annotation>
         </attribute>
         <attribute name="type" type="string" use="required">
            <annotation>
               <documentation>
                  
               </documentation>
            </annotation>
         </attribute>
      </complexType>
   </element>
</schema>

Fields.java

package com.example.miniscout.client.fields;

import java.util.HashMap;
import java.util.Map;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.Platform;

import com.google.common.base.Throwables;

public class Fields {

  private static Map<String /* type */, IConfigurationElement> fields = new HashMap<String, IConfigurationElement>();

  private static Map<String, IConfigurationElement> getFields() {
    IExtensionRegistry registry = Platform.getExtensionRegistry();
    IConfigurationElement[] elements = registry
        .getConfigurationElementsFor("com.example.miniscout.client.fields");
    for (IConfigurationElement e : elements) {
      fields.put(e.getAttribute("type"), e);
    }
    return fields;
  }

  public static FormField newField(String type) {
    try {
      Map<String, IConfigurationElement> f = getFields();
      IConfigurationElement e = f.get(type);
      return (FormField) e.createExecutableExtension("class");
    } catch (CoreException e) {
      throw Throwables.propagate(e);
    }
  }
}

plugin.xml

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.4"?>
<plugin>
   <extension-point id="fields" name="Form Fields" schema="schema/fields.exsd"/>
   <!-- skipped previous content -->
   <extension
         point="com.example.miniscout.client.fields">
      <Field
            class="com.example.miniscout.client.fields.StringFormField"
            name="String Form Field"
            type="string">
      </Field>
      <Field
            class="com.example.miniscout.client.fields.IntFormField"
            name="Integer Form Field"
            type="int">
      </Field>
   </extension>

</plugin>