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src/main/java/tools/IntervalBuilder.java

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+/*
+    This file is part of the HeavenMS MapleStory Server
+    Copyleft (L) 2016 - 2019 RonanLana
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as
+    published by the Free Software Foundation version 3 as published by
+    the Free Software Foundation. You may not use, modify or distribute
+    this program under any other version of the GNU Affero General Public
+    License.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+package tools;
+
+import java.awt.geom.Line2D;
+import java.util.ArrayList;
+import java.util.List;
+import net.server.audit.locks.MonitoredLockType;
+import net.server.audit.locks.MonitoredReadLock;
+import net.server.audit.locks.MonitoredReentrantReadWriteLock;
+import net.server.audit.locks.MonitoredWriteLock;
+import net.server.audit.locks.factory.MonitoredReadLockFactory;
+import net.server.audit.locks.factory.MonitoredWriteLockFactory;
+
+/**
+ *
+ * @author Ronan
+ */
+public class IntervalBuilder {
+        
+    private List<Line2D> intervalLimits = new ArrayList<>();
+    
+    protected MonitoredReadLock intervalRlock;
+    protected MonitoredWriteLock intervalWlock;
+    
+    public IntervalBuilder() {
+        MonitoredReentrantReadWriteLock locks = new MonitoredReentrantReadWriteLock(MonitoredLockType.INTERVAL, true);
+        intervalRlock = MonitoredReadLockFactory.createLock(locks);
+        intervalWlock = MonitoredWriteLockFactory.createLock(locks);
+    }
+
+    private void refitOverlappedIntervals(int st, int en, int newFrom, int newTo) {
+        List<Line2D> checkLimits = new ArrayList<>(intervalLimits.subList(st, en));
+
+        float newLimitX1, newLimitX2;
+        if (!checkLimits.isEmpty()) {
+            Line2D firstLimit = checkLimits.get(0);
+            Line2D lastLimit = checkLimits.get(checkLimits.size() - 1);
+
+            newLimitX1 = (float) ((newFrom < firstLimit.getX1()) ? newFrom : firstLimit.getX1());
+            newLimitX2 = (float) ((newTo > lastLimit.getX2()) ? newTo : lastLimit.getX2());
+
+            for (Line2D limit : checkLimits) {
+                intervalLimits.remove(st);
+            }
+        } else {
+            newLimitX1 = newFrom;
+            newLimitX2 = newTo;
+        }
+
+        intervalLimits.add(st, new Line2D.Float((float) newLimitX1, 0, (float) newLimitX2, 0));
+    }
+
+    private int bsearchInterval(int point) {
+        int st = 0, en = intervalLimits.size() - 1;
+
+        int mid, idx;
+        while (en >= st) {
+            idx = (st + en) / 2;
+            mid = (int) intervalLimits.get(idx).getX1();
+
+            if (mid == point) {
+                return idx;
+            } else if (mid < point) {
+                st = idx + 1;
+            } else {
+                en = idx - 1;
+            }
+        }
+
+        return en;
+    }
+
+    public void addInterval(int from, int to) {
+        intervalWlock.lock();
+        try {
+            int st = bsearchInterval(from);
+            if (st < 0) {
+                st = 0;
+            } else if (intervalLimits.get(st).getX2() < from) {
+                st += 1;
+            }
+
+            int en = bsearchInterval(to);
+            if (en < st) en = st - 1;
+
+            refitOverlappedIntervals(st, en + 1, from, to);
+        } finally {
+            intervalWlock.unlock();
+        }
+    }
+
+    public boolean inInterval(int point) {
+        return inInterval(point, point);
+    }
+    
+    public boolean inInterval(int from, int to) {
+        intervalRlock.lock();
+        try {
+            int idx = bsearchInterval(from);
+            return idx >= 0 && to <= intervalLimits.get(idx).getX2();
+        } finally {
+            intervalRlock.unlock();
+        }
+    }
+
+    public void clear() {
+        intervalWlock.lock();
+        try {
+            intervalLimits.clear();
+        } finally {
+            intervalWlock.unlock();
+        }
+    }
+    
+}