1 /**

     2  * Copyright (c) 2010 Symbian Foundation and/or its subsidiary(-ies).

     3  * All rights reserved.

     4  * This component and the accompanying materials are made available

     5  * under the terms of the License "Eclipse Public License v1.0"

     6  * which accompanies this distribution, and is available

     7  * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8  *

     9  * Initial Contributors:

    10  * Symbian Foundation - initial contribution.

    11  * Contributors:

    12  * Description:

    13  * Overview:

    14  * Details:

    15  * Platforms/Drives/Compatibility:

    16  * Assumptions/Requirement/Pre-requisites:

    17  * Failures and causes:

    18  */

    19 package org.symbian.tools.mtw.core.internal.projects;

    20 

    21 import org.eclipse.core.expressions.EvaluationContext;

    22 import org.eclipse.core.expressions.EvaluationResult;

    23 import org.eclipse.core.expressions.Expression;

    24 import org.eclipse.core.expressions.ExpressionConverter;

    25 import org.eclipse.core.resources.IProject;

    26 import org.eclipse.core.runtime.CoreException;

    27 import org.eclipse.core.runtime.IConfigurationElement;

    28 import org.symbian.tools.mtw.core.MTWCore;

    29 import org.symbian.tools.mtw.core.projects.IMTWProject;

    30 import org.symbian.tools.mtw.core.projects.IMTWProjectProvider;

    31 

    32 public class ProjectProvider implements IMTWProjectProvider {

    33     private final IConfigurationElement element;

    34     private final Expression expression;

    35     private IMTWProjectProvider provider;

    36 

    37     public ProjectProvider(IConfigurationElement element) throws CoreException {

    38         this.element = element;

    39         IConfigurationElement[] children = element.getChildren("enablement");

    40         if (children.length == 1) {

    41             expression = ExpressionConverter.getDefault().perform(children[0]);

    42         } else {

    43             expression = null;

    44             if (children.length > 1) {

    45                 MTWCore.log(

    46                         "Project extension in plugin %s has several <enablement> elements. All expressions will be ignored.",

    47                         element.getNamespaceIdentifier());

    48             }

    49         }

    50     }

    51 

    52     public IMTWProject create(IProject project) {

    53         return getProvider().create(project);

    54     }

    55 

    56     private IMTWProjectProvider getProvider() {

    57         if (provider == null) {

    58             try {

    59                 provider = (IMTWProjectProvider) element.createExecutableExtension("class");

    60             } catch (CoreException e) {

    61                 throw new RuntimeException(e);

    62             }

    63         }

    64         return provider;

    65     }

    66 

    67     public boolean isSupportedProject(final IProject project) {

    68         try {

    69             final EvaluationResult result = expression.evaluate(new EvaluationContext(null, project));

    70             if (EvaluationResult.TRUE.equals(result)) {

    71                 return getProvider().isSupportedProject(project);

    72             }

    73         } catch (CoreException e) {

    74             MTWCore.log(null, e);

    75         }

    76         return false;

    77     }

    78 }