eclipse插件开发 popupMenu 怎么才能右键点击JAVA文件时候才展示插件

eclipse插件开发 popupMenu 只有右键点击JAVA文件时候才展示插件 ，右键点工程部显示
我在网上找了一下，都不行

plugin.xml 文件如下

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.3"?>

point="org.eclipse.ui.popupMenus">
objectClass="org.eclipse.core.runtime.IAdaptable"
id="org.slive.quickcmd.contribution">
definitionId="org.slive.quickcmd.command.QuickCmdAction"
label="Run As Uiautomator"
class="org.slive.quickcmd.actions.QuickCmdAction"
menubarPath="additions"
enablesFor="1"
icon="icons/QuickCmd.jpg"
id="org.slive.quickcmd.QuickCmdAction">

definitionId="org.slive.quickcmd.command.QuickCmdAction"
label="Setting Uiautomator"
class="org.slive.quickcmd.actions.SettingAction"
menubarPath="additions"
enablesFor="1"
icon="icons/QuickCmd.jpg"
id="org.slive.quickcmd.QuickCmdAction">



point="org.eclipse.ui.commands">
description="Open cmd window from project or file quickly"
id="org.slive.quickcmd.commands.category"
name="Quick"/>
<!-- Commands -->
categoryId="org.slive.quickcmd.commands.category"
id="org.slive.quickcmd.command.QuickCmdAction"
name="Quick Cmd"/>

point="org.eclipse.ui.bindings">
<!-- Keyassist -->
commandId="org.slive.quickcmd.command.QuickCmdAction"
contextId="org.eclipse.ui.contexts.window"
schemeId="org.eclipse.ui.defaultAcceleratorConfiguration"
sequence="Alt+C"/>

非常希望能提供一个DEMO.感谢

http://wenku.baidu.com/link?url=auzwDkBWkNnuyv8wDGjtYCeHJNcXmc9PSdIyZFe0tqQC4jt9-RPiZgtoisbV6sPr3nwKEQi140hc3Upx4wcdD0CDl8JucUs7GRBStCL5lza

objectclass改为IFile,表示只对文件类型可见。
nameFilter属性设置为*.java，表示只对java文件可见