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/*
* Copyright 2000-2011 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.completion;
import com.intellij.codeInsight.ExpectedTypeInfo;
import com.intellij.codeInsight.completion.impl.BetterPrefixMatcher;
import com.intellij.codeInsight.completion.impl.CamelHumpMatcher;
import com.intellij.codeInsight.lookup.AutoCompletionPolicy;
import com.intellij.codeInsight.lookup.LookupElement;
import com.intellij.openapi.util.registry.Registry;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.*;
import com.intellij.psi.filters.ElementFilter;
import com.intellij.psi.search.PsiShortNamesCache;
import com.intellij.util.CollectConsumer;
import com.intellij.util.Consumer;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
import static com.intellij.patterns.PsiJavaPatterns.psiClass;
import static com.intellij.patterns.PsiJavaPatterns.psiElement;
/**
* @author peter
*/
public class JavaNoVariantsDelegator extends CompletionContributor {
@Override
public void fillCompletionVariants(@NotNull final CompletionParameters parameters, @NotNull CompletionResultSet result) {
LinkedHashSet<CompletionResult> plainResults = result.runRemainingContributors(parameters, true);
final boolean empty = containsOnlyPackages(plainResults) || suggestMetaAnnotations(parameters);
if (!empty && parameters.getInvocationCount() == 0) {
result.restartCompletionWhenNothingMatches();
}
if (empty) {
delegate(parameters, JavaCompletionSorting.addJavaSorting(parameters, result));
} else if (Registry.is("ide.completion.show.better.matching.classes")) {
if (parameters.getCompletionType() == CompletionType.BASIC &&
parameters.getInvocationCount() <= 1 &&
JavaCompletionContributor.mayStartClassName(result) &&
JavaCompletionContributor.isClassNamePossible(parameters) &&
!JavaSmartCompletionContributor.AFTER_NEW.accepts(parameters.getPosition())) {
result = result.withPrefixMatcher(new BetterPrefixMatcher(result.getPrefixMatcher(), BetterPrefixMatcher.getBestMatchingDegree(plainResults)));
InheritorsHolder holder = new InheritorsHolder(parameters.getPosition(), result);
for (CompletionResult plainResult : plainResults) {
LookupElement element = plainResult.getLookupElement();
if (element instanceof TypeArgumentCompletionProvider.TypeArgsLookupElement) {
((TypeArgumentCompletionProvider.TypeArgsLookupElement)element).registerSingleClass(holder);
}
}
suggestNonImportedClasses(parameters, JavaCompletionSorting.addJavaSorting(parameters, result), holder);
}
}
}
private static boolean suggestMetaAnnotations(CompletionParameters parameters) {
PsiElement position = parameters.getPosition();
return psiElement().withParents(PsiJavaCodeReferenceElement.class, PsiAnnotation.class, PsiModifierList.class, PsiClass.class).accepts( position) &&
psiElement().withSuperParent(4, psiClass().isAnnotationType()).accepts(position);
}
public static boolean containsOnlyPackages(LinkedHashSet<CompletionResult> results) {
for (CompletionResult result : results) {
if (!(CompletionUtil.getTargetElement(result.getLookupElement()) instanceof PsiPackage)) {
return false;
}
}
return true;
}
private static void delegate(CompletionParameters parameters, final CompletionResultSet result) {
if (parameters.getCompletionType() == CompletionType.BASIC) {
PsiElement position = parameters.getPosition();
suggestCollectionUtilities(parameters, result, position);
if (parameters.getInvocationCount() <= 1 &&
JavaCompletionContributor.mayStartClassName(result) &&
JavaCompletionContributor.isClassNamePossible(parameters)) {
suggestNonImportedClasses(parameters, result, null);
return;
}
suggestChainedCalls(parameters, result, position);
}
if (parameters.getCompletionType() == CompletionType.SMART && parameters.getInvocationCount() == 2) {
result.runRemainingContributors(parameters.withInvocationCount(3), true);
}
}
private static void suggestCollectionUtilities(CompletionParameters parameters, final CompletionResultSet result, PsiElement position) {
if (StringUtil.isNotEmpty(result.getPrefixMatcher().getPrefix())) {
for (ExpectedTypeInfo info : JavaSmartCompletionContributor.getExpectedTypes(parameters)) {
new CollectionsUtilityMethodsProvider(position, info.getType(), info.getDefaultType(), result).addCompletions(true);
}
}
}
private static void suggestChainedCalls(CompletionParameters parameters, CompletionResultSet result, PsiElement position) {
PsiElement parent = position.getParent();
if (!(parent instanceof PsiJavaCodeReferenceElement) || parent.getParent() instanceof PsiImportStatementBase) {
return;
}
PsiElement qualifier = ((PsiJavaCodeReferenceElement)parent).getQualifier();
if (!(qualifier instanceof PsiJavaCodeReferenceElement) ||
((PsiJavaCodeReferenceElement)qualifier).isQualified()) {
return;
}
PsiElement target = ((PsiJavaCodeReferenceElement)qualifier).resolve();
if (target != null && !(target instanceof PsiPackage)) {
return;
}
PsiFile file = position.getContainingFile();
if (file instanceof PsiJavaCodeReferenceCodeFragment) {
return;
}
String fullPrefix = parent.getText().substring(0, parameters.getOffset() - parent.getTextRange().getStartOffset());
CompletionResultSet qualifiedCollector = result.withPrefixMatcher(fullPrefix);
ElementFilter filter = JavaCompletionContributor.getReferenceFilter(position);
for (LookupElement base : suggestQualifierItems(parameters, (PsiJavaCodeReferenceElement)qualifier, filter)) {
PsiType type = JavaCompletionUtil.getLookupElementType(base);
if (type != null && !PsiType.VOID.equals(type)) {
PsiReferenceExpression ref = ReferenceExpressionCompletionContributor.createMockReference(position, type, base);
if (ref != null) {
for (final LookupElement item : JavaSmartCompletionContributor.completeReference(position, ref, filter, true, true, parameters,
result.getPrefixMatcher())) {
qualifiedCollector.addElement(new JavaChainLookupElement(base, item));
}
}
}
}
}
private static Set<LookupElement> suggestQualifierItems(CompletionParameters parameters,
PsiJavaCodeReferenceElement qualifier,
ElementFilter filter) {
String referenceName = qualifier.getReferenceName();
if (referenceName == null) {
return Collections.emptySet();
}
PrefixMatcher qMatcher = new CamelHumpMatcher(referenceName);
Set<LookupElement> plainVariants =
JavaSmartCompletionContributor.completeReference(qualifier, qualifier, filter, true, true, parameters, qMatcher);
for (PsiClass aClass : PsiShortNamesCache.getInstance(qualifier.getProject()).getClassesByName(referenceName, qualifier.getResolveScope())) {
plainVariants.add(JavaClassNameCompletionContributor.createClassLookupItem(aClass, true));
}
if (!plainVariants.isEmpty()) {
return plainVariants;
}
final Set<LookupElement> allClasses = new LinkedHashSet<LookupElement>();
JavaClassNameCompletionContributor.addAllClasses(parameters.withPosition(qualifier.getReferenceNameElement(), qualifier.getTextRange().getEndOffset()),
true, qMatcher, new CollectConsumer<LookupElement>(allClasses));
return allClasses;
}
private static void suggestNonImportedClasses(CompletionParameters parameters, final CompletionResultSet result, @Nullable final InheritorsHolder inheritorsHolder) {
JavaClassNameCompletionContributor.addAllClasses(parameters,
true, result.getPrefixMatcher(), new Consumer<LookupElement>() {
@Override
public void consume(LookupElement element) {
if (inheritorsHolder != null && inheritorsHolder.alreadyProcessed(element)) {
return;
}
JavaPsiClassReferenceElement classElement = element.as(JavaPsiClassReferenceElement.CLASS_CONDITION_KEY);
if (classElement != null) {
classElement.setAutoCompletionPolicy(AutoCompletionPolicy.NEVER_AUTOCOMPLETE);
}
result.addElement(element);
}
});
}
}
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