| /* |
| * 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.calcite.util; |
| |
| import org.apache.calcite.linq4j.Enumerator; |
| import org.apache.calcite.linq4j.Linq4j; |
| |
| import java.util.AbstractSet; |
| import java.util.Iterator; |
| import java.util.Set; |
| |
| /** |
| * A set of non-negative integers defined by a sequence of points, intervals, |
| * and exclusions. |
| */ |
| public class IntegerIntervalSet extends AbstractSet<Integer> { |
| private final String s; |
| |
| private IntegerIntervalSet(String s) { |
| this.s = s; |
| } |
| |
| private static void visit(String s, Handler handler) { |
| final String[] split = s.split(","); |
| for (String s1 : split) { |
| if (s1.isEmpty()) { |
| continue; |
| } |
| boolean exclude = false; |
| if (s1.startsWith("-")) { |
| s1 = s1.substring(1); |
| exclude = true; |
| } |
| final String[] split1 = s1.split("-"); |
| if (split1.length == 1) { |
| final int n = Integer.parseInt(split1[0]); |
| handler.range(n, n, exclude); |
| } else { |
| final int n0 = Integer.parseInt(split1[0]); |
| final int n1 = Integer.parseInt(split1[1]); |
| handler.range(n0, n1, exclude); |
| } |
| } |
| } |
| |
| /** |
| * Parses a range of integers expressed as a string. The string can contain |
| * non-negative integers separated by commas, ranges (represented by a |
| * hyphen between two integers), and exclusions (represented by a preceding |
| * hyphen). For example, "1,2,3-20,-7,-10-15,12". |
| * |
| * <p>Inclusions and exclusions are performed in the order that they are |
| * seen. For example, "1-10,-2-9,3-7,-4-6"</p> does contain 3, because it is |
| * included by "1-10", excluded by "-2-9" and last included by "3-7". But it |
| * does not include 4. |
| * |
| * @param s Range set |
| */ |
| public static Set<Integer> of(String s) { |
| return new IntegerIntervalSet(s); |
| } |
| |
| @SuppressWarnings("NullableProblems") |
| @Override public Iterator<Integer> iterator() { |
| return Linq4j.enumeratorIterator(enumerator()); |
| } |
| |
| @Override public int size() { |
| int n = 0; |
| Enumerator<Integer> e = enumerator(); |
| while (e.moveNext()) { |
| ++n; |
| } |
| return n; |
| } |
| |
| private Enumerator<Integer> enumerator() { |
| final int[] bounds = {Integer.MAX_VALUE, Integer.MIN_VALUE}; |
| visit( |
| s, |
| new Handler() { |
| public void range(int start, int end, boolean exclude) { |
| if (!exclude) { |
| bounds[0] = Math.min(bounds[0], start); |
| bounds[1] = Math.max(bounds[1], end); |
| } |
| } |
| }); |
| return new Enumerator<Integer>() { |
| int i = bounds[0] - 1; |
| |
| public Integer current() { |
| return i; |
| } |
| |
| public boolean moveNext() { |
| for (;;) { |
| if (++i > bounds[1]) { |
| return false; |
| } |
| if (contains(i)) { |
| return true; |
| } |
| } |
| } |
| |
| public void reset() { |
| i = bounds[0] - 1; |
| } |
| |
| public void close() { |
| // no resources |
| } |
| }; |
| } |
| |
| @Override public boolean contains(Object o) { |
| return o instanceof Number |
| && contains(((Number) o).intValue()); |
| } |
| |
| public boolean contains(final int n) { |
| final boolean[] bs = {false}; |
| visit( |
| s, |
| new Handler() { |
| public void range(int start, int end, boolean exclude) { |
| if (start <= n && n <= end) { |
| bs[0] = !exclude; |
| } |
| } |
| }); |
| return bs[0]; |
| } |
| |
| /** A callback. */ |
| private interface Handler { |
| void range(int start, int end, boolean exclude); |
| } |
| } |
| |
| // End IntegerIntervalSet.java |