Java Expression.evaluate方法代码示例

import org.eclipse.core.expressions.Expression; //导入方法依赖的package包/类
public boolean test(Object receiver, String property, Object[] args,
    Object expectedValue) {
  String delegateShortcutID = (String) args[0];
  Expression expr = expressions.get(delegateShortcutID);
  if (expr == null) {
    expr = createEnablementExpression(delegateShortcutID);
    expressions.put(delegateShortcutID, expr);
  }
  try {
    return expr.evaluate(createContext(receiver)) != EvaluationResult.FALSE;
  } catch (CoreException ce) {
    EclEmmaUIPlugin.getInstance().getLog()
        .log(EclEmmaUIPlugin.errorStatus("Launch shortcut '" //$NON-NLS-1$
            + delegateShortcutID
            + "' enablement expression caused exception.", //$NON-NLS-1$
            ce));
    return false;
  }
}
 

import org.eclipse.core.expressions.Expression; //导入方法依赖的package包/类
public boolean matches(IJavaProject javaProject) {
	if (fStatus != null) {
		return fStatus.booleanValue();
	}

	IConfigurationElement[] children= fConfigurationElement.getChildren(ExpressionTagNames.ENABLEMENT);
	if (children.length == 1) {
		try {
			ExpressionConverter parser= ExpressionConverter.getDefault();
			Expression expression= parser.perform(children[0]);
			EvaluationContext evalContext= new EvaluationContext(null, javaProject);
			evalContext.addVariable("project", javaProject); //$NON-NLS-1$
			evalContext.addVariable("sourceLevel", javaProject.getOption(JavaCore.COMPILER_SOURCE, true)); //$NON-NLS-1$
			return expression.evaluate(evalContext) == EvaluationResult.TRUE;
		} catch (CoreException e) {
			JavaPlugin.log(e);
		}
		return false;
	}
	fStatus= Boolean.FALSE;
	return false;
}
 

import org.eclipse.core.expressions.Expression; //导入方法依赖的package包/类
public static EditPart createEditPart( EditPart context, Object model )
{
	EvaluationContext econtext = new EvaluationContext( null, model );
	for ( Iterator<Expression> iterator = extensionMap.keySet( ).iterator( ); iterator.hasNext( ); )
	{
		try
		{
			Expression expression = iterator.next( );
			if ( expression.evaluate( econtext ) == EvaluationResult.TRUE )
			{
				EditPart editPart = (EditPart) extensionMap.get( expression )
						.createExecutableExtension( "type" ); //$NON-NLS-1$
				editPart.setModel( model );
				return editPart;
			}
		}
		catch ( CoreException e )
		{
			logger.log( Level.SEVERE, e.getMessage( ), e );
		}
	}
	return null;
}
 

import org.eclipse.core.expressions.Expression; //导入方法依赖的package包/类
private boolean matches(ICompilationUnit cunit) {
	if (fRequiredSourceLevel != null) {
		String current= cunit.getJavaProject().getOption(JavaCore.COMPILER_SOURCE, true);
		if (JavaModelUtil.isVersionLessThan(current, fRequiredSourceLevel)) {
			return false;
		}
	}

	if (fStatus != null) {
		return fStatus.booleanValue();
	}

	IConfigurationElement[] children= fConfigurationElement.getChildren(ExpressionTagNames.ENABLEMENT);
	if (children.length == 1) {
		try {
			ExpressionConverter parser= ExpressionConverter.getDefault();
			Expression expression= parser.perform(children[0]);
			EvaluationContext evalContext= new EvaluationContext(null, cunit);
			evalContext.addVariable("compilationUnit", cunit); //$NON-NLS-1$
			IJavaProject javaProject= cunit.getJavaProject();
			String[] natures= javaProject.getProject().getDescription().getNatureIds();
			evalContext.addVariable("projectNatures", Arrays.asList(natures)); //$NON-NLS-1$
			evalContext.addVariable("sourceLevel", javaProject.getOption(JavaCore.COMPILER_SOURCE, true)); //$NON-NLS-1$
			return expression.evaluate(evalContext) == EvaluationResult.TRUE;
		} catch (CoreException e) {
			JavaPlugin.log(e);
		}
		return false;
	}
	fStatus= Boolean.FALSE;
	return false;
}