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Diffstat (limited to 'src/de/lmu/ifi/dbs/elki/data/type/SimpleTypeInformation.java')
-rw-r--r-- | src/de/lmu/ifi/dbs/elki/data/type/SimpleTypeInformation.java | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/src/de/lmu/ifi/dbs/elki/data/type/SimpleTypeInformation.java b/src/de/lmu/ifi/dbs/elki/data/type/SimpleTypeInformation.java new file mode 100644 index 00000000..cf381780 --- /dev/null +++ b/src/de/lmu/ifi/dbs/elki/data/type/SimpleTypeInformation.java @@ -0,0 +1,98 @@ +package de.lmu.ifi.dbs.elki.data.type; +/* +This file is part of ELKI: +Environment for Developing KDD-Applications Supported by Index-Structures + +Copyright (C) 2011 +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/>. +*/ + +/** + * Class wrapping a particular data type. + * + * @author Erich Schubert + * + * @param <T> Java type we represent. + */ +public class SimpleTypeInformation<T> implements TypeInformation { + /** + * The restriction class we represent. + */ + private Class<? super T> cls; + + /** + * Constructor. + * + * @param cls restriction class + */ + public SimpleTypeInformation(Class<? super T> cls) { + super(); + this.cls = cls; + } + + /** + * Get the raw restriction class. + * + * @return Restriction class + */ + public final Class<? super T> getRestrictionClass() { + return cls; + } + + @Override + public boolean isAssignableFromType(TypeInformation type) { + if(!(type instanceof SimpleTypeInformation)) { + return false; + } + final SimpleTypeInformation<?> simpleType = (SimpleTypeInformation<?>) type; + return cls.isAssignableFrom(simpleType.getRestrictionClass()); + } + + @Override + public boolean isAssignableFrom(Object other) { + return cls.isInstance(other); + } + + /** + * Cast the object to type T (actually to the given restriction class!) + * + * @param other Object to cast. + * @return Instance + */ + @SuppressWarnings("unchecked") + public T cast(Object other) { + return (T) cls.cast(other); + } + + /** + * Pseudo constructor that is often convenient to use when T is not completely + * known. + * + * @param <T> Type + * @param cls Class restriction + * @return Type + */ + public static <T> SimpleTypeInformation<T> get(Class<T> cls) { + return new SimpleTypeInformation<T>(cls); + } + + @Override + public String toString() { + return getRestrictionClass().getSimpleName(); + } +}
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