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Merge pull request #3209 from matthiasblaesing/indexability_query
Allow plugins to exclude files from being indexed
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84 changes: 84 additions & 0 deletions
84
ide/parsing.indexing/src/org/netbeans/modules/parsing/impl/indexing/FilteringIterable.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you 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 org.netbeans.modules.parsing.impl.indexing; | ||
|
|
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| import java.util.Iterator; | ||
| import java.util.NoSuchElementException; | ||
| import java.util.function.Function; | ||
|
|
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| /** | ||
| * Iterable wrapping another iterable, yielding an interator, that only offers | ||
| * values, for this the supplied filter returns a true value. | ||
| */ | ||
| class FilteringIterable<T> implements Iterable<T> { | ||
| private final Iterable<? extends T> delegate; | ||
| private final Function<T,Boolean> filter; | ||
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| public FilteringIterable(Iterable<? extends T> delegate, Function<T,Boolean> filter) { | ||
| this.delegate = delegate; | ||
| this.filter = filter; | ||
| } | ||
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| @Override | ||
| public Iterator<T> iterator() { | ||
| return new FilteringIterator(delegate.iterator(), filter); | ||
| } | ||
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| private static class FilteringIterator<T> implements Iterator<T> { | ||
| private final Iterator<? extends T> delegate; | ||
| private final Function<T,Boolean> filter; | ||
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| public FilteringIterator(Iterator<? extends T> delegate, Function<T,Boolean> filter) { | ||
| this.delegate = delegate; | ||
| this.filter = filter; | ||
| } | ||
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| private T next; | ||
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| @Override | ||
| public boolean hasNext() { | ||
| fillNextIfPossible(); | ||
| return next != null; | ||
| } | ||
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| @Override | ||
| public T next() { | ||
| fillNextIfPossible(); | ||
| if(next == null) { | ||
| throw new NoSuchElementException(); | ||
| } | ||
| T value = next; | ||
| next = null; | ||
| return value; | ||
| } | ||
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| private void fillNextIfPossible() { | ||
| if (next == null) { | ||
| while (delegate.hasNext()) { | ||
| T nextCandiate = delegate.next(); | ||
| if(filter.apply(nextCandiate)) { | ||
| next = nextCandiate; | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
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