扩展点文件：notifierProvider.exsd
<?xml version='1.0' encoding='UTF-8'?>
<schema targetNamespace="test" xmlns="http://www.w3.org/2001/XMLSchema">
<annotation>
<appInfo>
<meta.schema plugin="test.plugin" id="notifierProvider" name="Notifier Service Provider"/>
</appInfo>
<documentation>
[Enter description of this extension point.]
</documentation>
</annotation>
<element name="extension">
<annotation>
<appInfo>
<meta.element />
</appInfo>
</annotation>
<complexType>
<sequence>
<element ref="NotifierProvider"/>
</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="NotifierProvider">
<complexType>
<sequence>
<element ref="Priority"/>
<element ref="Event" minOccurs="1" maxOccurs="unbounded"/>
</sequence>
<attribute name="class" type="string" use="required">
<annotation>
<documentation>
</documentation>
<appInfo>
<meta.attribute kind="java" basedOn="test.AbstractNoifierProvider:"/>
</appInfo>
</annotation>
</attribute>
</complexType>
</element>
<element name="Event">
<complexType>
<attribute name="eventId" type="string" use="required">
<annotation>
<documentation>
</documentation>
</annotation>
</attribute>
</complexType>
</element>
<element name="Priority">
<complexType>
<attribute name="name" use="required">
<annotation>
<documentation>
</documentation>
</annotation>
<simpleType>
<restriction base="string">
<enumeration value="Lowest">
</enumeration>
<enumeration value="Low">
</enumeration>
<enumeration value="Medium">
</enumeration>
<enumeration value="High">
</enumeration>
<enumeration value="Highest">
</enumeration>
</restriction>
</simpleType>
</attribute>
</complexType>
</element>
<annotation>
<appInfo>
<meta.section type="since"/>
</appInfo>
<documentation>
[Enter the first release in which this extension point appears.]
</documentation>
</annotation>
<annotation>
<appInfo>
<meta.section type="examples"/>
</appInfo>
<documentation>
[Enter extension point usage example here.]
</documentation>
</annotation>
<annotation>
<appInfo>
<meta.section type="apiinfo"/>
</appInfo>
<documentation>
[Enter API information here.]
</documentation>
</annotation>
<annotation>
<appInfo>
<meta.section type="implementation"/>
</appInfo>
<documentation>
[Enter information about supplied implementation of this extension point.]
</documentation>
</annotation>
</schema>
通知器接口INotifier
/**
* 通知器接口
*/
public interface INotifier
{
/**
* 通知事件
* @param event
*/
void notify(INotifierEvent event);
/**
* 获取事件id，也就是这个通知器能处理哪些事件
* @return 事件id
*/
String[] getEventIds();
}
扩展点抽象基类AbstractNoifierProvider
/**
* 抽象的通知提供器
*/
public abstract class AbstractNoifierProvider extends AbstractProvider implements INotifier
{
private List<String> eventIds = new ArrayList<String>();
/*
* （此注释不是Javadoc注释）
*
*/
@Override
public String[] getEventIds()
{
return eventIds.toArray(new String[eventIds.size()]);
}
/**
* 添加事件id
*
* @param eventId
*/
void addEventId(String eventId)
{
if (!StringUtils.isEmpty(eventId))
{
eventIds.add(eventId);
}
}
/*
* （此注释不是Javadoc注释）
*
* @see
* org.eclipse.gmf.runtime.common.core.service.IProvider#provides(org.eclipse.gmf.runtime.common.core.service.IOperation
* )
*/
@Override
public boolean provides(IOperation operation)
{
if (operation instanceof NotifierOperation)
{
String eventID = ((NotifierOperation)operation).getNotifierID();
if (StringUtils.isNotEmpty(eventID))
{
for (int i = 0; i < eventIds.size(); i++)
{
if (eventID.equals(eventIds.get(i)))
{
return true;
}
}
}
}
return false;
}
}
通知操作对象NotifierOperation
/**
* 通知操作对象
*/
public class NotifierOperation implements IOperation
{
private INotifierEvent event;
/* （此注释不是Javadoc注释）
* @see org.eclipse.gmf.runtime.common.core.service.IOperation#execute(org.eclipse.gmf.runtime.common.core.service.IProvider)
*/
/**
* 构造函数
* @param event
*/
public NotifierOperation(INotifierEvent event)
{
super();
this.event = event;
}
@Override
public Object execute(IProvider provider)
{
if (provider instanceof INotifier)
{
((INotifier)provider).notify(event);
}
return null;
}
/**
* 获取事件id
* @return 事件id
*/
public String getNotifierID()
{
if (event != null)
{
return event.getEventId();
}
return StringUtils.EMPTY;
}
}
通知服务NotifierService
/**
* 通知服务，针对事件的通知
*/
public class NotifierService extends Service implements INotifier
{
private static NotifierService instance = new NotifierService();
static
{
instance.configureProviders(TestPlugin.PLUGIN_ID,
"notifierProvider"); //$NON-NLS-1$
}
/**
* 构造函数
*/
private NotifierService()
{
super();
}
/**
* 获取单态对象
* @return NotifierService
*/
public static NotifierService getInstance()
{
return instance;
}
/* （此注释不是Javadoc注释）
* @see com.huawei.enip.esdt.project.core.notifier.INotifier#getEventIds()
*/
@SuppressWarnings("unchecked")
@Override
public String[] getEventIds()
{
List<String> allEvents = new ArrayList<String>();
List<Object> allProviders = getAllProviders();
if (allProviders == null || allProviders.isEmpty())
{
return allEvents.toArray(new String[allEvents.size()]);
}
for (int i = 0; i < allProviders.size(); i++)
{
Object object = allProviders.get(i);
if (object instanceof AbstractNoifierProvider)
{
String[] eventIds = ((AbstractNoifierProvider)object).getEventIds();
if (eventIds == null)
{
continue;
}
for (int j = 0; j < eventIds.length; j++)
{
if (!StringUtils.isEmpty(eventIds[j]))
{
allEvents.add(eventIds[j]);
}
}
}
}
return allEvents.toArray(new String[allEvents.size()]);
}
@Override
public void notify(INotifierEvent event)
{
NotifierOperation operation = new NotifierOperation(event);
execute(ExecutionStrategy.FORWARD, operation);
}
@Override
protected ProviderDescriptor newProviderDescriptor(
IConfigurationElement element)
{
//扩展的描述
return new NotifierServiceProviderDescriptor(element);
}
/**
* 通知服务扩展的描述
*/
public static class NotifierServiceProviderDescriptor extends
Service.ProviderDescriptor
{
private static final String Event = "Event"; //$NON-NLS-1$
private static final String eventId = "eventId"; //$NON-NLS-1$
/**
* 构造函数
* @param arg0
*/
protected NotifierServiceProviderDescriptor(IConfigurationElement arg0)
{
super(arg0);
}
/* （此注释不是Javadoc注释）
* @see org.eclipse.gmf.runtime.common.core.service.Service.ProviderDescriptor#getProvider()
*/
@Override
public IProvider getProvider()
{
IProvider iProvider = super.getProvider();
if (iProvider instanceof AbstractNoifierProvider)
{
IConfigurationElement[] children = getElement().getChildren(Event);
if (children != null)
{
for (int i = 0; i < children.length; i++)
{
IConfigurationElement element = children[i];
String attribute = element.getAttribute(eventId);
((AbstractNoifierProvider)iProvider).addEventId(attribute);
}
}
}
return iProvider;
}
}
}