1 files changed, 90 insertions, 0 deletions
diff --git a/src/de/lmu/ifi/dbs/elki/utilities/optionhandling/constraints/ListEachConstraint.java b/src/de/lmu/ifi/dbs/elki/utilities/optionhandling/constraints/ListEachConstraint.java
new file mode 100644
index 00000000..7dab4006
--- /dev/null
+++ b/src/de/lmu/ifi/dbs/elki/utilities/optionhandling/constraints/ListEachConstraint.java
@@ -0,0 +1,90 @@
+package de.lmu.ifi.dbs.elki.utilities.optionhandling.constraints;
+
+/*
+ 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 java.util.ArrayList;
+import java.util.List;
+
+import de.lmu.ifi.dbs.elki.utilities.optionhandling.ParameterException;
+
+/**
+ * Applies constraints to all elements of a list.
+ * 
+ * @author Erich Schubert
+ * 
+ * @apiviz.composedOf ParameterConstraint oneway 1 n
+ */
+public class ListEachConstraint<T> implements ParameterConstraint<List<T>> {
+  /**
+   * Constraints
+   */
+  private List<ParameterConstraint<? super T>> constraints;
+
+  /**
+   * Constructor.
+   */
+  public ListEachConstraint() {
+    super();
+    this.constraints = new ArrayList<ParameterConstraint<? super T>>();
+  }
+
+  /**
+   * Constructor.
+   * 
+   * @param constraint Constraint to apply to all elements
+   */
+  public ListEachConstraint(ParameterConstraint<? super T> constraint) {
+    super();
+    this.constraints = new ArrayList<ParameterConstraint<? super T>>(1);
+    this.constraints.add(constraint);
+  }
+
+  /**
+   * Add a constraint to this operator.
+   * 
+   * @param constraint Constraint
+   */
+  public void addConstraint(ParameterConstraint<? super T> constraint) {
+    this.constraints.add(constraint);
+  }
+
+  @Override
+  public void test(List<T> t) throws ParameterException {
+    for (T e : t) {
+      for (ParameterConstraint<? super T> c : constraints) {
+        c.test(e);
+      }
+    }
+  }
+
+  @Override
+  public String getDescription(String parameterName) {
+    final String all = "all elements of " + parameterName;
+    StringBuilder b = new StringBuilder();
+    for (ParameterConstraint<? super T> c : constraints) {
+      b.append(c.getDescription(all));
+    }
+    return b.toString();
+  }
+}