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/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.intellij.openapi.progress;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
/**
* @author yole
*/
public abstract class ProgressIndicatorProvider {
@Nullable
public static ProgressIndicatorProvider ourInstance;
public static ProgressIndicatorProvider getInstance() {
return ourInstance;
}
public abstract ProgressIndicator getProgressIndicator();
protected abstract void doCheckCanceled() throws ProcessCanceledException;
@Nullable
public static ProgressIndicator getGlobalProgressIndicator() {
return ourInstance != null ? ourInstance.getProgressIndicator() : null;
}
@NotNull
public abstract NonCancelableSection startNonCancelableSection();
@NotNull
public static NonCancelableSection startNonCancelableSectionIfSupported() {
return ourInstance != null ? ourInstance.startNonCancelableSection() : NonCancelableSection.EMPTY;
}
protected static volatile boolean ourNeedToCheckCancel = false;
public static void checkCanceled() throws ProcessCanceledException {
// smart optimization! There's a thread started in ProgressManagerImpl, that set's this flag up once in 10 milliseconds
if (ourNeedToCheckCancel && ourInstance != null) {
ourNeedToCheckCancel = false; // doCheckCanceled() may flip it back to true
ourInstance.doCheckCanceled();
}
}
}
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