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/*
* Copyright (c) 2013, 2015 QNX Software Systems and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.cdt.internal.qt.core.index;
import java.util.Arrays;
import java.util.concurrent.atomic.AtomicReference;
import org.eclipse.cdt.core.settings.model.ICConfigurationDescription;
import org.eclipse.cdt.internal.qt.core.Activator;
import org.eclipse.cdt.internal.qt.core.index.IQMakeEnvProvider.IController;
import org.eclipse.core.expressions.EvaluationContext;
import org.eclipse.core.expressions.EvaluationResult;
import org.eclipse.core.expressions.Expression;
import org.eclipse.core.expressions.ExpressionConverter;
import org.eclipse.core.expressions.ExpressionTagNames;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
/**
* Represents a IQMakeEnvProvider that is registered via qmakeEnvProvider extension point.
*/
public final class QMakeEnvProviderDescriptor implements Comparable<QMakeEnvProviderDescriptor> {
private static final String ATTR_CLASS = "class"; //$NON-NLS-1$
private static final String ATTR_PRIORITY = "priority"; //$NON-NLS-1$
private static final String VAR_PROJECTNATURES = "projectNatures"; //$NON-NLS-1$
private final IConfigurationElement element;
private final String id;
private final int priority;
private final AtomicReference<Boolean> evaluation = new AtomicReference<Boolean>();
private final Expression enablementExpression;
QMakeEnvProviderDescriptor(IConfigurationElement element) {
this.element = element;
id = element.getContributor().getName();
// parse priority
int prio = 0;
String priorityString = element.getAttribute(ATTR_PRIORITY);
if (priorityString != null) {
try {
prio = Integer.parseInt(priorityString);
} catch (NumberFormatException e) {
Activator.log("Invalid priority value of " + id, e); //$NON-NLS-1$
}
}
this.priority = prio;
// parse enablement expression
Expression expr = null;
IConfigurationElement[] children = element.getChildren(ExpressionTagNames.ENABLEMENT);
switch (children.length) {
case 0:
evaluation.set(Boolean.TRUE);
break;
case 1:
try {
ExpressionConverter parser = ExpressionConverter.getDefault();
expr = parser.perform(children[0]);
} catch (CoreException e) {
Activator.log("Error in enablement expression of " + id, e); //$NON-NLS-1$
}
break;
default:
Activator.log("Too many enablement expressions for " + id); //$NON-NLS-1$
evaluation.set(Boolean.FALSE);
break;
}
enablementExpression = expr;
}
@Override
public int compareTo(QMakeEnvProviderDescriptor that) {
if (that == null) {
return -1;
}
return this.priority - that.priority;
}
/**
* Used by QMakeEnvProviderManager to ask for creating a IQMakeEnv for a specific IQMakeEnvProvider.IController using the related IQMakeEnvProvider
*
* @param controller the controller
* @return the IQMakeEnv instance; or null if no instance is provided
*/
public IQMakeEnv createEnv(IController controller) {
if (! matches(controller)) {
return null;
}
IQMakeEnvProvider provider;
try {
provider = (IQMakeEnvProvider) element.createExecutableExtension(ATTR_CLASS);
} catch (CoreException e) {
Activator.log("Error in class attribute of " + id, e); //$NON-NLS-1$
return null;
}
return provider.createEnv(controller);
}
/**
* Checks whether an enablement expression evaluation is true.
*
* @param controller the controller
* @return true if the provider can be used; false otherwise
*/
private boolean matches(IController controller) {
Boolean eval = evaluation.get();
if (eval != null) {
return eval.booleanValue();
}
if (enablementExpression != null) {
ICConfigurationDescription configuration = controller != null ? controller.getConfiguration() : null;
IProject project = configuration != null ? configuration.getProjectDescription().getProject() : null;
EvaluationContext evalContext = new EvaluationContext(null, project);
try {
if (project != null) {
String[] natures = project.getDescription().getNatureIds();
evalContext.addVariable(VAR_PROJECTNATURES, Arrays.asList(natures));
}
return enablementExpression.evaluate(evalContext) == EvaluationResult.TRUE;
} catch (CoreException e) {
Activator.log("Error while evaluating enablement expression for " + id, e); //$NON-NLS-1$
}
}
evaluation.set(Boolean.FALSE);
return false;
}
}
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