| /* |
| * |
| * 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.apache.qpid.transport; |
| |
| import static org.apache.qpid.util.Serial.lt; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.ListIterator; |
| |
| public class RangeSetImpl implements RangeSet |
| { |
| |
| private List<Range> ranges; |
| |
| public RangeSetImpl() |
| { |
| ranges = new ArrayList<Range>(); |
| } |
| |
| public RangeSetImpl(int size) |
| { |
| ranges = new ArrayList<Range>(size); |
| } |
| |
| |
| public RangeSetImpl(org.apache.qpid.transport.RangeSetImpl copy) |
| { |
| ranges = new ArrayList<Range>(copy.ranges); |
| } |
| |
| public int size() |
| { |
| return ranges.size(); |
| } |
| |
| public Iterator<Range> iterator() |
| { |
| return ranges.iterator(); |
| } |
| |
| public Range getFirst() |
| { |
| return ranges.get(0); |
| } |
| |
| public Range getLast() |
| { |
| return ranges.get(ranges.size() - 1); |
| } |
| |
| public boolean includes(Range range) |
| { |
| for (Range r : this) |
| { |
| if (r.includes(range)) |
| { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| public boolean includes(int n) |
| { |
| for (Range r : this) |
| { |
| if (r.includes(n)) |
| { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| public void add(Range range) |
| { |
| ListIterator<Range> it = ranges.listIterator(); |
| |
| while (it.hasNext()) |
| { |
| Range next = it.next(); |
| if (range.touches(next)) |
| { |
| it.remove(); |
| range = range.span(next); |
| } |
| else if (lt(range.getUpper(), next.getLower())) |
| { |
| it.previous(); |
| it.add(range); |
| return; |
| } |
| } |
| |
| it.add(range); |
| } |
| |
| public void add(int lower, int upper) |
| { |
| switch(ranges.size()) |
| { |
| case 0: |
| ranges.add(Range.newInstance(lower, upper)); |
| break; |
| |
| case 1: |
| Range first = ranges.get(0); |
| if(first.getUpper() + 1 >= lower && upper >= first.getUpper()) |
| { |
| ranges.set(0, Range.newInstance(first.getLower(), upper)); |
| break; |
| } |
| |
| default: |
| add(Range.newInstance(lower, upper)); |
| } |
| |
| |
| } |
| |
| public void add(int value) |
| { |
| add(value, value); |
| } |
| |
| public void clear() |
| { |
| ranges.clear(); |
| } |
| |
| public void subtract(final RangeSet other) |
| { |
| final Iterator<Range> otherIter = other.iterator() ; |
| if (otherIter.hasNext()) |
| { |
| Range otherRange = otherIter.next(); |
| final ListIterator<Range> iter = ranges.listIterator() ; |
| if (iter.hasNext()) |
| { |
| Range range = iter.next(); |
| do |
| { |
| if (otherRange.getUpper() < range.getLower()) |
| { |
| otherRange = nextRange(otherIter) ; |
| } |
| else if (range.getUpper() < otherRange.getLower()) |
| { |
| range = nextRange(iter) ; |
| } |
| else |
| { |
| final boolean first = range.getLower() < otherRange.getLower() ; |
| final boolean second = otherRange.getUpper() < range.getUpper() ; |
| |
| if (first) |
| { |
| iter.set(Range.newInstance(range.getLower(), otherRange.getLower()-1)) ; |
| if (second) |
| { |
| iter.add(Range.newInstance(otherRange.getUpper()+1, range.getUpper())) ; |
| iter.previous() ; |
| range = iter.next() ; |
| } |
| else |
| { |
| range = nextRange(iter) ; |
| } |
| } |
| else if (second) |
| { |
| range = Range.newInstance(otherRange.getUpper()+1, range.getUpper()) ; |
| iter.set(range) ; |
| otherRange = nextRange(otherIter) ; |
| } |
| else |
| { |
| iter.remove() ; |
| range = nextRange(iter) ; |
| } |
| } |
| } |
| while ((otherRange != null) && (range != null)) ; |
| } |
| } |
| } |
| |
| private Range nextRange(final Iterator<Range> iter) |
| { |
| return (iter.hasNext() ? iter.next() : null) ; |
| } |
| |
| public RangeSet copy() |
| { |
| return new org.apache.qpid.transport.RangeSetImpl(this); |
| } |
| |
| public String toString() |
| { |
| StringBuffer str = new StringBuffer(); |
| str.append("{"); |
| boolean first = true; |
| for (Range range : ranges) |
| { |
| if (first) |
| { |
| first = false; |
| } |
| else |
| { |
| str.append(", "); |
| } |
| str.append(range); |
| } |
| str.append("}"); |
| return str.toString(); |
| } |
| } |