Eclipse WTP Projects Facets实战指南(2)

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Eclipse EXT UI XML Tomcat

修饰工作
给facet在选择列表中添加图标
格式如下:

xml 代码

<extension point="org.eclipse.wst.common.project.facet.ui.images">
<image facet="{string}" path="{string}"/> (0 or more)
<image category="{string}" path="{string}"/> (0 or more)
extension>

设置如下:

xml 代码

<extension point="org.eclipse.wst.common.project.facet.ui.images">
<image facet="formgen.core" path="icons/formgen-core.gif"/>
<image facet="formgen.ext" path="icons/formgen-ext.gif"/>
<image category="formgen.category" path="icons/formgen-cat.gif"/>
extension>

效果如图

添加向导页
有时候我们可能需要根据用户的输入来执行facet, 通过添加wizard page来接收用户的输入, 用户在facet选择列表页做出选择之后,将出现我们添加的wizard Page
下面通过给我们的servlet指定url pattern的例子来进行说明
plugin.xml设置格式如下:

xml 代码

<extension point="org.eclipse.wst.common.project.facet.core.facets">
<action>
<config-factory class="class:org.eclipse.wst.common.project.facet.core.IActionConfigFactory"/>
action>
extension>
<extension point="org.eclipse.wst.common.project.facet.ui.wizardPages">
<wizard-pages action="{string}"> (0 or more)
<page class="{class:org.eclipse.wst.common.project.facet.ui.IFacetWizardPage}"/> (1 or more)
wizard-pages>
extension>

这里需要说明的是为了让我们定制的wizard page和action delegate之间进行通信, 需要使用一个javabean或者是map来封装wizard page中输入的数据, 而且必须在action配置中提供一个action factory,该对象将由factory创建, wizard page填充数据, action delegate负责从该对象读取数据

除外,wizard page将通过指定的action id来引用action, 这也是我们前面推荐指定action id而不是系统生成的原因

配置如下:

xml 代码

<extension point="org.eclipse.wst.common.project.facet.core.facets">
<project-facet-version facet="formgen.core" version="1.0">
<action type="INSTALL" id="formgen.core.install">
<config-factory class="com.formgen.eclipse.FormGenCoreFacetInstallConfig$Factory"/>
action>
project-facet-version>
extension>
<extension point="org.eclipse.wst.common.project.facet.ui.wizardPages">
<wizard-pages action="formgen.core.install">
<page class="com.formgen.eclipse.FormGenCoreFacetInstallPage"/>
wizard-pages>
extension>

代码如下:

java 代码

package com.formgen.eclipse;
import org.eclipse.wst.common.project.facet.core.IActionConfigFactory;
public final class FormGenCoreFacetInstallConfig
{
private String urlPattern = "*.form";
public String getUrlPattern()
{
return this.urlPattern;
}
public void setUrlPattern( final String urlPattern )
{
this.urlPattern = urlPattern;
}
public static final class Factory implements IActionConfigFactory
{
public Object create()
{
return new FormGenCoreFacetInstallConfig();
}
}
}

java 代码

package com.formgen.eclipse;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;
import org.eclipse.wst.common.project.facet.ui.AbstractFacetWizardPage;
public final class FormGenCoreFacetInstallPage extends AbstractFacetWizardPage
{
private FormGenCoreFacetInstallConfig config;
private Text urlPatternTextField;
public FormGenCoreFacetInstallPage()
{
super( "formgen.core.facet.install.page" );
setTitle( "FormGen Core" );
setDescription( "Configure the FormGen servlet." );
}
public void createControl( final Composite parent )
{
final Composite composite = new Composite( parent, SWT.NONE );
composite.setLayout( new GridLayout( 1, false ) );
final Label label = new Label( composite, SWT.NONE );
label.setLayoutData( gdhfill() );
label.setText( "URL Pattern:" );
this.urlPatternTextField = new Text( composite, SWT.BORDER );
this.urlPatternTextField.setLayoutData( gdhfill() );
this.urlPatternTextField.setText( this.config.getUrlPattern() );
setControl( composite );
}
public void setConfig( final Object config )
{
this.config = (FormGenCoreFacetInstallConfig) config;
}
public void transferStateToConfig()
{
this.config.setUrlPattern( this.urlPatternTextField.getText() );
}
private static GridData gdhfill()
{
return new GridData( GridData.FILL_HORIZONTAL );
}
}

java 代码

package com.formgen.eclipse;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.Path;
import org.eclipse.wst.common.project.facet.core.IDelegate;
import org.eclipse.wst.common.project.facet.core.IProjectFacetVersion;
public final class FormGenCoreFacetInstallDelegate implements IDelegate
{
public void execute( final IProject pj,
final IProjectFacetVersion fv,
final Object config,
final IProgressMonitor monitor )
throws CoreException
{
monitor.beginTask( "", 2 );
try
{
final FormGenCoreFacetInstallConfig cfg
= (FormGenCoreFacetInstallConfig) config;
final IFolder webInfLib = Utils.getWebInfLibDir( pj );
Utils.copyFromPlugin( new Path( "libs/formgen-core.jar" ),
webInfLib.getFile( "formgen-core.jar" ) );
monitor.worked( 1 );
Utils.registerFormGenServlet( pj, cfg.getUrlPattern() );
monitor.worked( 1 );
}
finally
{
monitor.done();
}
}
}

效果如图

定义Preset
为了将创建某个工程所需要的facet集中在一个用一个名字代替,这就需要使用preset(或称configuration),其扩展点格式如下:

xml 代码

<extension point="org.eclipse.wst.common.project.facet.core.facets">
<preset id="{string}">
<label>{string}</label>
<description>{string}</description> (optional)
<facet id="{string}" version="{string}"/> (1 or more)
</preset>
</extension>

为了让preset能应用于指定的facet project, preset必须包含所有的fixed facet, 所谓的fixed facet指的是那些要创建的工程所必须的而不能删除的facet.
设置如下:

xml 代码

<extension point="org.eclipse.wst.common.project.facet.core.facets">
<preset id="formgen.preset">
<label>FormGen Web Project</label>
<description>Creates a web project with FormGen functionality.</description>
<facet id="jst.java" version="5.0"/>
<facet id="jst.web" version="2.2"/>
<facet id="formgen.core" version="1.0"/>
<facet id="formgen.ext" version="1.0"/>
</preset>
</extension>

效果如图

指定runtime映射
在创建project的时候,有时候需要指定项目依赖的runtime,我们也可以通过扩展点来检查当前的facet所需要的runtime是否指定.
配置格式如下:

xml 代码

<extension point="org.eclipse.wst.common.project.facet.core.runtimes">
<supported> (0 or more)
<runtime-component any="{boolean}"/> (optional)
<runtime-component id="{string}"/ version="{version.expr}"/> (0 or more)
<facet id="{string}"/ version="{version.expr}"/> (1 or more)
</supported>
</extension>

下面是不依赖其他组件的配置:

xml 代码

<extension point="org.eclipse.wst.common.project.facet.core.runtimes">
<supported>
<runtime-component any="true"/>
<facet id="formgen.core"/>
<facet id="formgen.ext"/>
</supported>
</extension>

下面是依赖tomcat的配置

xml 代码

<extension point="org.eclipse.wst.common.project.facet.core.runtimes">
<supported>
<runtime-component id="org.eclipse.jst.server.tomcat" version="[5.0"/>
<facet id="formgen.core"/>
<facet id="formgen.ext"/>
</supported>
</extension>

总结

通过上面的步骤, 我们创建了一个完整的project facet, 这里面包括指定约束, 实现action, 对facet分组, 创建wizard page. 更多的信息可看下面的参考附录
附录A 定制Version Comparetor
就是对版本进行比较的策略进行定制, 如果要使用自己的版本比较方式, 那么可以通过扩展点来处理,格式如下:

xml 代码

<extension point="org.eclipse.wst.common.project.facet.core.facets">
<project-facet>
<version-comparator class="{class:java.util.Comparator<String>}"/>
</project-facet>
</extension>

可以直接从接口从头实现,也可以继承org.eclipse.wst.common.project.facet.core.DefaultVersionComparator来进行定制
代码如下:

java 代码

/**
* Returns the string containing the separator characters that should be
* used when breaking the version string into segments. The default
* implementation returns ".". Subclasses can override this method.
*
* @return the separator characters
*/
protected String getSeparators();
/**
* Parses a segment of the version string. The default implementation parses
* the first segment as an integer (leading zeroes are ignored) and the
* rest of the segments as decimals (leading zeroes are kept). Subclasses
* can override this method to provide custom parsing for any number of
* segments.
*
* @param version the full version string
* @param segment the version segment
* @param position the position of the segment in the version string
* @return the parsed representation of the segment as a {@see Comparable}
* @throws VersionFormatException if encountered an error while parsing
*/
protected Comparable parse( final String version,
final String segment,
final int position )
throws VersionFormatException;

附录B Version Expression
为了一次指定多个版本,就需要使用版本表达式(version expression), 在很多地方我都用到了版本表达式, 版本表达式如果有多个,则使用逗号分隔,这里的逗号表示或的意思, 范围通过括号加破折号来制定,如[x-z), 中括号表示包含, 小括号表示不包含
下面是一些例子:
1.2
1.2,1.5,3.2
[1.2-3.2]
[3.7-5.0)
[3.7
5.0)
1.2,[3.0-4.5),[7.3
附录C Event Handler
project fact可以为某些事件注册listener, 这些时间包括:
PRE_INSTALL
POST_INSTALL
PRE_UNINSTALL
POST_UNINSTALL
PRE_VERSION_CHANGE
POST_VERSION_CHANGE
RUNTIME_CHANGED
事件处理器的声明和action的声明非常类似,但是他们也有一些区别,主要体现在:
与action不同, 事件处理器无法由用户直接触发,因此无法将事件处理器与wizard page关联,也无法为其提供封装数据的配置对象
可以给一个事件设置多个事件处理器,但是他们的调用顺序是不确定的
事件处理器的配置格式如下:

xml 代码

<extension point="org.eclipse.wst.common.project.facet.core.facets">
<event-handler facet="{string}" version="{version.expr}" type="{event.type}">
<delegate class="{class:org.eclipse.wst.common.project.facet.core.IDelegate}"/>
</action>
</extension>

与action的配置很类似,也实现了IDelegate接口, 而且event-handler也可以嵌入到project-facet-version元素内部,此时的facet和version属性将被忽略.

PRE_* and POST_* 事件处理器用来取得配置对象,然后传递给IDelegate的execute方法使用, RUNTIME_CHANGED 事件处理器是用来取得IRuntimeChangedEvent实例

java 代码

package org.eclipse.wst.common.project.facet.core;
import org.eclipse.wst.common.project.facet.core.runtime.IRuntime;
/**
* Describes the runtime changed event to the RUNTIME_CHANGED event handlers.
*/
public interface IRuntimeChangedEvent
{
/**
* Returns the runtime previously associated with the project.
*
* @return the runtime previously associated with the project, or null
*/
IRuntime getOldRuntime();
/**
* Returns the runtime that's now associated with the project.
*
* @return the runtime that's now associated with the project, or null
*/
IRuntime getNewRuntime();
}

附录D Property Tester
Property Tester是用来被org.eclipse.core.expressions 包中的扩展点测试使用的,它常用来决定某些菜单或者属性页选项是否可用.属性名为org.eclipse.wst.common.project.facet.core.projectFacet,值为facet id或者facet id 加冒号再加版本表达式的组合
下面的这个例子用来控制project的属性页是否可用

xml 代码

<extension point="org.eclipse.ui.propertyPages">
<page
adaptable="true"
objectClass="org.eclipse.core.resources.IProject"
name="FormGen Properties"
class="com.formgen.eclipse.FormGenPropertiesPage"
id="org.eclipse.jst.j2ee.internal.J2EEDependenciesPage">
<enabledWhen>
<test
forcePluginActivation="true"
property="org.eclipse.wst.common.project.facet.core.projectFacet"
value="formgen.core"/>
</enabledWhen>
</page>
</extension>

附录E Wizard Content
有时候我们可能根据其他facet所对应的wizard page的用户输入来调整action的行为, 而IWizardContet接口就是为该目的而设计的, wizard page的setWizardContext方法被调用的时候会取得该接口的handler, 如果你的代码对IWziardContenxt造成依赖,可能需要注意以下事项:
1.fact需要的内容可能在执行前已经被install了, 此时在wizard context中将无法找到要install的配置,所以在需要做一些判断
2.如果某些情况下wizard page不被调用的话,要给配置对象设置默认值
下面是IWizardContext接口的代码:

java 代码

package org.eclipse.wst.common.project.facet.ui;
import java.util.Set;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.wst.common.project.facet.core.IProjectFacetVersion;
import org.eclipse.wst.common.project.facet.core.IFacetedProject.Action;
import org.eclipse.wst.common.project.facet.core.IFacetedProject.Action.Type;
/**
* The interface exposed to the facet action wizard pages that allows them
* to gather information about the wizard state.
*/
public interface IWizardContext
{
/**
* Returns the name of the project that the wizard is operating on. If the
* wizard is in the project creation mode, the project will not yet exist
* in the workspace.
*
* @return the name of the project that the wizard is operating on
*/
String getProjectName();
/**
* Returns the set of facets currently selected in the wizard. If the wizard
* is in the add/remove facets mode (vs. project creation), this method will
* return the set of facets currently installed in a project after being
* modified by the current set of actions.
*
* @return the set of facets currently selected in the wizard (element type:
* {@see IProjectFacetVersion})
*/

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看到一句话,感触很深 | Eclipse WTP Projects Facets实战指南(1)

2007-11-21 21:13
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