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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.codeInsight.navigation;
import com.intellij.codeInsight.CodeInsightBundle;
import com.intellij.codeInsight.TargetElementUtilBase;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.progress.ProgressManager;
import com.intellij.openapi.project.IndexNotReadyException;
import com.intellij.openapi.project.DumbService;
import com.intellij.openapi.util.Computable;
import com.intellij.psi.PsiElement;
import com.intellij.psi.search.PsiElementProcessor;
import com.intellij.psi.search.PsiElementProcessorAdapter;
import com.intellij.psi.search.SearchScope;
import com.intellij.psi.search.searches.DefinitionsScopedSearch;
import com.intellij.util.CommonProcessors;
import gnu.trove.THashSet;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
public class ImplementationSearcher {
public static final String SEARCHING_FOR_IMPLEMENTATIONS = CodeInsightBundle.message("searching.for.implementations");
@NotNull
public PsiElement[] searchImplementations(final Editor editor, final PsiElement element, final int offset) {
final TargetElementUtilBase targetElementUtil = TargetElementUtilBase.getInstance();
boolean onRef = ApplicationManager.getApplication().runReadAction(new Computable<Boolean>() {
@Override
public Boolean compute() {
return targetElementUtil.findTargetElement(editor, getFlags() & ~(TargetElementUtilBase.REFERENCED_ELEMENT_ACCEPTED | TargetElementUtilBase.LOOKUP_ITEM_ACCEPTED), offset) == null;
}
});
return searchImplementations(element, editor, offset, onRef && ApplicationManager.getApplication().runReadAction(new Computable<Boolean>() {
@Override
public Boolean compute() {
return element == null || targetElementUtil.includeSelfInGotoImplementation(element);
}
}), onRef);
}
@NotNull
public PsiElement[] searchImplementations(final PsiElement element,
final Editor editor, final int offset,
final boolean includeSelfAlways,
final boolean includeSelfIfNoOthers) {
if (element == null) return PsiElement.EMPTY_ARRAY;
final PsiElement[] elements = searchDefinitions(element, editor);
if (elements == null) return PsiElement.EMPTY_ARRAY; //the search has been cancelled
if (elements.length > 0) {
if (!includeSelfAlways) return filterElements(element, elements, offset);
final PsiElement[] all;
if (element.getTextRange() != null) {
all = new PsiElement[elements.length + 1];
all[0] = element;
System.arraycopy(elements, 0, all, 1, elements.length);
}
else {
all = elements;
}
return filterElements(element, all, offset);
}
return (includeSelfAlways || includeSelfIfNoOthers) && element.getTextRange() != null ?
new PsiElement[] {element} :
PsiElement.EMPTY_ARRAY;
}
protected static SearchScope getSearchScope(final PsiElement element, final Editor editor) {
return ApplicationManager.getApplication().runReadAction(new Computable<SearchScope>() {
@Override
public SearchScope compute() {
return TargetElementUtilBase.getInstance().getSearchScope(editor, element);
}
});
}
@Nullable("For the case the search has been cancelled")
protected PsiElement[] searchDefinitions(final PsiElement element, final Editor editor) {
final PsiElement[][] result = new PsiElement[1][];
if (!ProgressManager.getInstance().runProcessWithProgressSynchronously(new Runnable() {
@Override
public void run() {
try {
result[0] = DefinitionsScopedSearch.search(element, getSearchScope(element, editor)).toArray(PsiElement.EMPTY_ARRAY);
}
catch (IndexNotReadyException e) {
dumbModeNotification(element);
result[0] = null;
}
}
}, SEARCHING_FOR_IMPLEMENTATIONS, true, element.getProject())) {
return null;
}
return result[0];
}
public static void dumbModeNotification(PsiElement element) {
DumbService.getInstance(element.getProject()).showDumbModeNotification("Implementation information isn't available while indices are built");
}
protected PsiElement[] filterElements(PsiElement element, PsiElement[] targetElements, final int offset) {
return targetElements;
}
public static int getFlags() {
return TargetElementUtilBase.getInstance().getDefinitionSearchFlags();
}
public static class FirstImplementationsSearcher extends ImplementationSearcher {
@Override
protected PsiElement[] searchDefinitions(final PsiElement element, final Editor editor) {
final PsiElement[][] result = new PsiElement[1][];
if (canShowPopupWithOneItem(element)) {
return new PsiElement[]{element};
}
final PsiElementProcessor.CollectElementsWithLimit<PsiElement> collectProcessor = new PsiElementProcessor.CollectElementsWithLimit<PsiElement>(2, new THashSet<PsiElement>());
if (!ProgressManager.getInstance().runProcessWithProgressSynchronously(new Runnable() {
@Override
public void run() {
try {
DefinitionsScopedSearch.search(element, getSearchScope(element, editor)).forEach(new PsiElementProcessorAdapter<PsiElement>(collectProcessor){
@Override
public boolean processInReadAction(PsiElement element) {
if (!accept(element)) return true;
return super.processInReadAction(element);
}
});
result[0] = collectProcessor.toArray();
}
catch (IndexNotReadyException e) {
ImplementationSearcher.dumbModeNotification(element);
result[0] = null;
}
}
}, SEARCHING_FOR_IMPLEMENTATIONS, true, element.getProject())) {
return null;
}
return result[0];
}
protected boolean canShowPopupWithOneItem(PsiElement element) {
return accept(element);
}
protected boolean accept(PsiElement element) {
return true;
}
}
public static abstract class BackgroundableImplementationSearcher extends ImplementationSearcher {
@Override
protected PsiElement[] searchDefinitions(final PsiElement element, Editor editor) {
final CommonProcessors.CollectProcessor<PsiElement> processor = new CommonProcessors.CollectProcessor<PsiElement>() {
@Override
public boolean process(PsiElement element) {
processElement(element);
return super.process(element);
}
};
try {
DefinitionsScopedSearch.search(element, getSearchScope(element, editor)).forEach(processor);
}
catch (IndexNotReadyException e) {
ImplementationSearcher.dumbModeNotification(element);
return null;
}
return processor.toArray(PsiElement.EMPTY_ARRAY);
}
protected abstract void processElement(PsiElement element);
}
}
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