1 files changed, 160 insertions, 0 deletions
diff --git a/src/de/lmu/ifi/dbs/elki/database/ids/integer/UnmodifiableIntegerArrayDBIDs.java b/src/de/lmu/ifi/dbs/elki/database/ids/integer/UnmodifiableIntegerArrayDBIDs.java
new file mode 100644
index 00000000..14e26748
--- /dev/null
+++ b/src/de/lmu/ifi/dbs/elki/database/ids/integer/UnmodifiableIntegerArrayDBIDs.java
@@ -0,0 +1,160 @@
+package de.lmu.ifi.dbs.elki.database.ids.integer;
+
+/*
+ This file is part of ELKI:
+ Environment for Developing KDD-Applications Supported by Index-Structures
+
+ Copyright (C) 2012
+ Ludwig-Maximilians-Universität München
+ Lehr- und Forschungseinheit für Datenbanksysteme
+ ELKI Development Team
+
+ 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, either version 3 of the License, or
+ (at your option) any later version.
+
+ 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/>.
+ */
+
+import de.lmu.ifi.dbs.elki.database.ids.DBID;
+import de.lmu.ifi.dbs.elki.database.ids.DBIDMIter;
+import de.lmu.ifi.dbs.elki.database.ids.DBIDRef;
+import de.lmu.ifi.dbs.elki.database.ids.DBIDVar;
+
+/**
+ * Unmodifiable wrapper for DBIDs.
+ * 
+ * @author Erich Schubert
+ * 
+ * @apiviz.uses TroveArrayDBIDs
+ * @apiviz.has UnmodifiableDBIDIter
+ */
+public class UnmodifiableIntegerArrayDBIDs implements IntegerArrayStaticDBIDs {
+  /**
+   * The DBIDs we wrap.
+   */
+  private final TroveArrayDBIDs inner;
+
+  /**
+   * Constructor.
+   * 
+   * @param inner Inner DBID collection.
+   */
+  public UnmodifiableIntegerArrayDBIDs(TroveArrayDBIDs inner) {
+    super();
+    this.inner = inner;
+  }
+
+  @Override
+  public boolean contains(DBIDRef o) {
+    return inner.contains(o);
+  }
+
+  @Override
+  public boolean isEmpty() {
+    return inner.isEmpty();
+  }
+
+  @Override
+  public IntegerDBIDArrayIter iter() {
+    IntegerDBIDArrayIter it = inner.iter();
+    if (it instanceof DBIDMIter) {
+      return new UnmodifiableDBIDIter(it);
+    }
+    return it;
+  }
+
+  @Override
+  public int size() {
+    return inner.size();
+  }
+
+  @Override
+  public String toString() {
+    return inner.toString();
+  }
+
+  @Override
+  public DBID get(int i) {
+    return inner.get(i);
+  }
+
+  @Override
+  public void assign(int index, DBIDVar var) {
+    inner.assign(index, var);
+  }
+
+  @Override
+  public int binarySearch(DBIDRef key) {
+    return inner.binarySearch(key);
+  }
+
+  /**
+   * Make an existing DBIDMIter unmodifiable.
+   * 
+   * @author Erich Schubert
+   */
+  class UnmodifiableDBIDIter implements IntegerDBIDArrayIter {
+    /**
+     * Wrapped iterator.
+     */
+    private IntegerDBIDArrayIter it;
+
+    /**
+     * Constructor.
+     * 
+     * @param it inner iterator
+     */
+    public UnmodifiableDBIDIter(IntegerDBIDArrayIter it) {
+      super();
+      this.it = it;
+    }
+
+    @Override
+    public boolean valid() {
+      return it.valid();
+    }
+
+    @Override
+    public void advance() {
+      it.advance();
+    }
+
+    @Override
+    public void advance(int count) {
+      it.advance(count);
+    }
+
+    @Override
+    public void retract() {
+      it.retract();
+    }
+
+    @Override
+    public void seek(int off) {
+      it.seek(off);
+    }
+
+    @Override
+    public int getOffset() {
+      return it.getOffset();
+    }
+
+    @Override
+    public int internalGetIndex() {
+      return it.internalGetIndex();
+    }
+    
+    @Override
+    public String toString() {
+      return it.toString();
+    }
+  }
+}