Christian Dietrich 的提示为我指明了正确的方向。下面是我最终得到的代码。
我创建了一个实现 IOutputConfigurationProvider的新类MyOutputConfigurationProvider 。getOutputConfigurations方法返回两个输出配置,默认的src -gen和自定义的src-gen-once,其设置正确,只生成一次源。
package com.my.dsl;
import static com.google.common.collect.Sets.newHashSet;
import java.util.Set;
import org.eclipse.xtext.generator.IFileSystemAccess;
import org.eclipse.xtext.generator.IOutputConfigurationProvider;
import org.eclipse.xtext.generator.OutputConfiguration;
public class MyOutputConfigurationProvider implements
IOutputConfigurationProvider {
public final static String DEFAULT_OUTPUT_ONCE = "DEFAULT_OUTPUT_ONCE";
/**
* @return a set of {@link OutputConfiguration} available for the generator
*/
public Set<OutputConfiguration> getOutputConfigurations() {
OutputConfiguration defaultOutput = new OutputConfiguration(IFileSystemAccess.DEFAULT_OUTPUT);
defaultOutput.setDescription("Output Folder");
defaultOutput.setOutputDirectory("./src-gen");
defaultOutput.setOverrideExistingResources(true);
defaultOutput.setCreateOutputDirectory(true);
defaultOutput.setCleanUpDerivedResources(true);
defaultOutput.setSetDerivedProperty(true);
OutputConfiguration onceOutput = new OutputConfiguration(DEFAULT_OUTPUT_ONCE);
onceOutput.setDescription("Output Folder (once)");
onceOutput.setOutputDirectory("./src-gen-once");
onceOutput.setOverrideExistingResources(false);
onceOutput.setCreateOutputDirectory(true);
onceOutput.setCleanUpDerivedResources(false);
onceOutput.setSetDerivedProperty(true);
return newHashSet(defaultOutput, onceOutput);
}
}
要使用MyOutputConfigurationProvider实现,请将 configure 方法添加到您的模块类:
/**
* Use this class to register components to be used within the IDE.
*/
public class MyDslUiModule extends com.my.dsl.ui.AbstractMyDslUiModule {
public MyDslUiModule(AbstractUIPlugin plugin) {
super(plugin);
}
@Override
public void configure(Binder binder) {
super.configure(binder);
binder.bind(IOutputConfigurationProvider.class).to(MyOutputConfigurationProvider.class).in(Singleton.class);
}
}