com.qulice.checkstyle.LineRanges Maven / Gradle / Ivy
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*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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package com.qulice.checkstyle;
import com.google.common.base.Predicate;
import com.google.common.collect.FluentIterable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
/**
* Represents a set of LineRange objects. For example, an instance of this class
* could represent all the line ranges for methods in a given Java source code
* file.
*
* @since 0.16
*/
public final class LineRanges {
/**
* ArrayList of line ranges.
*/
private final LineRanges.LocalCollection lines =
new LineRanges.LocalCollection();
/**
* Adds a line range to the collection.
* @param line The line range to add to the collection
*/
public void add(final LineRange line) {
this.lines.collection().add(line);
}
/**
* Returns an iterator for this collection.
* @return Iterator pointing to the internal collections elements.
*/
public Iterator iterator() {
return this.lines.collection().iterator();
}
/**
* Detects if the given line number is within any of the line ranges.
* @param line The given line number to check
* @return True if the given line number is within any line range.
*/
public boolean inRange(final int line) {
return !this.lines.collection().isEmpty()
&& FluentIterable.from(this.lines.collection())
.anyMatch(new LineRanges.LineWithAny(line));
}
/**
* Gets the subset of LineRanges that are within all given ranges. Does
* not return null; instead, returns empty range if there are no matches.
* @param ranges The ranges to filter on.
* @return Returns all LineRange elements that are within range.
*/
public LineRanges within(final LineRanges ranges) {
final LineRanges result = new LineRanges();
final Iterator iterator = ranges.iterator();
while (iterator.hasNext()) {
final LineRange next = iterator.next();
for (final LineRange line : this.lines.collection()) {
if (next.within(line)) {
result.add(line);
}
}
}
return result;
}
/**
* Clears the collection.
*/
public void clear() {
this.lines.collection().clear();
}
/**
* Predicate to determine if a given line is within range of any of
* the line ranges.
*/
private static final class LineWithAny implements Predicate {
/**
* The given line.
*/
private final int given;
/**
* Default constructor.
* @param line The given line to check against all the line ranges.
*/
private LineWithAny(final int line) {
this.given = line;
}
@Override
public boolean apply(final LineRange range) {
return range != null && range.within(this.given);
}
}
/**
* Thread-safe collection of line ranges.
*/
private static final class LocalCollection
extends ThreadLocal> {
/**
* Internal Collection.
*/
private final transient Collection ranges =
new ArrayList<>(20);
/**
* Get the collection specific to the current thread only.
* @return The collection for this thread.
*/
public Collection collection() {
return this.ranges;
}
}
}