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<title>Tutorial: Adding find* Methods to Grails Domain Objects</title>
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<h1>Tutorial: Adding support for Grails Dynamic Types</h1>
This tutorial demonstrates how to add lookups for Grails dynamic types. Basic lookup on domain class 'find' members is
implemented.
<br>
Note that it is a demo and might be useful as a starting point for a full implementation. The source code for this
sample is available in the Codehaus Subversion repository - you can browse right away at
<a href="http://svn.groovy.codehaus.org/browse/groovy/trunk/groovy/ide/grails-eclipse">http://svn.groovy.codehaus.org/browse/groovy/trunk/groovy/ide/grails-eclipse</a>
.
<br>
<br>
The first step is to create a new plug-in project using the New wizard:
<br>
<br>
<img src="images/newProject1.png">
<br>
<br>
<br>
Enter
<em>org.codehaus.grails.eclipse.samples.types</em>
for the project name:
<br>
<br>
<img src="images/newProject2.png">
<br>
<br>
<br>
Next we configure the project. An activator is not needed nor does this plug-in contribute to the UI, so uncheck
the two options.
<br>
Click on finish and we are ready to set up the project environment.
<br>
<br>
<img src="images/newProject3.png">
<br>
<br>
<br>
The first step is to add the Groovy Nature. Normally this would happen automatically when the first Groovy
source file is created. However, since we are adding to GroovyEclipse itself, some additional steps are required.
<br>
<br>
First add the nature:
<br>
<br>
<img src="images/groovyNature1.png">
<br>
<br>
<br>
Next open the .classpath file and remove Groovy related libaries. This is required as this plug-in will import
the libraries from the core Groovy plugin. If these libraries are not removed there will be problems at runtime as
Groovy classes created with different class loaders attempt to interact.
<br>
<br>
The libraries to remove are highlighted:
<br>
<br>
<img src="images/groovyNature2.png">
<br>
<br>
<br>
Remove them and save and close the .classpath file:
<br>
<br>
<img src="images/groovyNature3.png">
<br>
<br>
<br>
By default, the Groovy plugin has set the output folder for compiled Groovy classes to bin-groovy. This folder must be
added as a library to the plugin configuration. Press the 'Add' button:
<br>
<br>
<img src="images/runtime1.png">
<br>
<br>
<br>
And add bin-groovy:
<br>
<br>
<img src="images/runtime2.png">
<br>
<br>
<br>
Finally, the dependency to the core GroovyEclipse plugin is added.
<br>
Press the 'Add' button:
<br>
<br>
<img src="images/dependencies1.png">
<br>
<br>
<br>
And select the core GroovyEclipse plugin. This is the plugin which exports the Groovy runtime libraries and defines the
extension points for the member lookup.
<br>
<br>
<img src="images/dependencies2.png">
<br>
<br>
<br>
<img src="images/dependencies3.png">
<br>
<br>
<br>
Finally we are ready to implement the extension. In the plugin editor, select the 'Extensions' tab and configure
the extention.
<br>
Press the 'Add' button and select the extension point. There should be only one visible. Afterwards it appears in the
extensions list:
<br>
<br>
<img src="images/extensions1.png">
<br>
<br>
<br>
Add a new 'memberLookup':
<br>
<br>
<img src="images/extensions2.png">
<br>
<br>
<br>
In the next step the class name implementing the lookup is added, as well as the source code contexts in which this lookup
is valid. Note that it is not necessary to use the qualified names for the contexts. We add both methodScope and
closureScope. If closureScope is not added, then this lookup will not work inside of closures which are nested within
methods.
<br>
<br>
<img src="images/extensions3.png">
<br>
<br>
<br>
Finally we are ready to code!
<br>
In the next two steps, a new package for our Groovy implementation is created:
<br>
<br>
<img src="images/newPackage1.png">
<br>
<br>
<br>
<img src="images/newPackage2.png">
<br>
<br>
<br>
And finally the Groovy source file to implement the Grails find methods lookup is created:
<br>
<br>
<img src="images/newGroovy1.png">
<br>
<br>
<br>
<img src="images/newGroovy2.png">
<br>
<br>
<h2>The Code</h2>
Lets start with the following code:
<br>
<p class="Code">package org.codehaus.grails.eclipse.samples.types <br>
<br>
import org.codehaus.groovy.eclipse.core.IGroovyProjectAware <br>
import org.codehaus.groovy.eclipse.core.context.ISourceCodeContext <br>
import org.codehaus.groovy.eclipse.core.context.ISourceCodeContextAware <br>
import org.codehaus.groovy.eclipse.core.model.GroovyProject <br>
import org.codehaus.groovy.eclipse.core.types.IMemberLookup <br>
<br>
class DomainFindMethodsLookup implements IMemberLookup, ISourceCodeContextAware, IGroovyProjectAware { <br>
ISourceCodeContext context <br>
GroovyProject project <br>
<br>
void setSourceCodeContext(ISourceCodeContext context) { <br>
this.context = context <br>
} <br>
<br>
void setGroovyProject(GroovyProject project) { <br>
this.project = project <br>
} <br>
}</p>
<br>
<br>
The two interfaces, ISourceCodeContextAware and IGroovyProjectAware indicate that this lookup wants to know about the
current project and context. This does not guarantee that a project and context will be set on this lookup, so care must
be taken to check that they have actually been set.
<br>
<br>
Next implement the IMemberLookup methods:
<br>
<p class="Code">import org.codehaus.groovy.eclipse.core.types.Field <br>
import org.codehaus.groovy.eclipse.core.types.Method <br>
import org.codehaus.groovy.eclipse.core.types.Modifiers <br>
import org.codehaus.groovy.eclipse.core.types.Parameter <br>
import org.codehaus.groovy.eclipse.core.types.Property <br>
import org.codehaus.groovy.eclipse.core.types.TypeUtil <br>
<br>
class DomainFindMethodsLookup implements IMemberLookup, ISourceCodeContextAware, IGroovyProjectAware { <br>
... <br>
<br>
Field[] lookupFields(String type, String name, boolean accessible, boolean staticAccess, boolean
exact) { <br>
return TypeUtil.NO_FIELDS <br>
} <br>
<br>
Property[] lookupProperties(String type, String name, boolean accessible, boolean staticAccess,
boolean exact) { <br>
return TypeUtil.NO_PROPERTIES <br>
} <br>
<br>
Method[] lookupMethods(String type, String name, boolean accessible, boolean staticAccess, boolean
exact) { <br>
} <br>
<br>
Method[] lookupMethods(String type, String name, String[] paramTypes, boolean accessible, <br>
boolean staticAccess, boolean exact) { <br>
return lookupMethods(type, name, accessible, staticAccess, exact) <br>
} <br>
<br>
... <br>
}</p>
<br>
<br>
TypeUtil is a class with many handly static helper methods, and is used above to return empty arrays.
<br>
<br>
In the next step we add some sanity checks, one of which checks that the object we are looking up methods for is in fact
a domain class:
<br>
<p class="Code"> Method[] lookupMethods(String type, String name, boolean accessible, boolean
staticAccess, boolean exact) { <br>
if (!staticAccess || !context || !project || !isDomainClass(type)) { <br>
return TypeUtil.NO_METHODS <br>
 
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groovy的eclipse插件 （237个子文件） 
JavaElementCategoryLookup.class 15KB JavaClassCategoryLookup.class 11KB CategoryLookup.class 11KB MemberLookupRegistry.class 9KB CSTUtil.class 8KB ContextUtil.class 6KB JavaElementCategoryLookup$_mapCategory_closure6.class 3KB CategoryLookup$_collectCategoryClassNames_closure4.class 3KB CategoryLookup$_collectAllMethods_closure1.class 3KB CategoryLookup$_createLookupsForClassNames_closure2.class 3KB MemberLookupRegistry$_createMemberLookup_closure2.class 3KB JavaClassCategoryLookup$_collectAllMethods_closure1.class 3KB JavaElementCategoryLookup$_collectAllMethods_closure1.class 2KB CategoryLookup$_collectCategoryClassNames_closure4_closure5.class 2KB JavaElementCategoryLookup$_collectAllMethods_closure2.class 2KB JavaElementCategoryLookup$_createJavaTypeHiearchy_closure3.class 2KB JavaElementCategoryLookup$_createGroovyTypeHiearchy_closure4.class 2KB JavaElementCategoryLookup$_createGroovyTypeHiearchy_closure5.class 2KB ContextUtil$__clinit__closure1.class 2KB MemberLookupRegistry$__clinit__closure1.class 2KB CategoryLookup$_createLookupsForClassNames_closure3.class 2KB internal-testRunTabs.exsd 3KB
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