From: erik Date: Sat, 30 Jul 2011 15:53:01 +0000 (+0000) Subject: UTILS-15: typesafe id. X-Git-Tag: BEFORE_SVN_TO_GIT X-Git-Url: http://wamblee.org/gitweb/?a=commitdiff_plain;h=22bc8b005cade7bb86acc58548aff47e266d155c;p=utils UTILS-15: typesafe id. --- diff --git a/support/general/src/main/java/org/wamblee/general/Id.java b/support/general/src/main/java/org/wamblee/general/Id.java new file mode 100644 index 00000000..925732fd --- /dev/null +++ b/support/general/src/main/java/org/wamblee/general/Id.java @@ -0,0 +1,72 @@ +/* + * Copyright 2005-2011 the original author or authors. + * + * Licensed 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.wamblee.general; + +/** + * This class provides a generic typesafe id wrapping a long value. + * + * @author Erik Brakkee + * + * @param + * Type the id refers to. + */ +public class Id implements Comparable> { + + private long id; + + /** + * Constructs the id. + * + * @param aId + * Integer id. + */ + public Id(long aId) { + id = aId; + } + + /** + * @return The underlying id. + */ + public long getId() { + return id; + } + + @Override + public int hashCode() { + return ((Long) id).hashCode(); + } + + @Override + public boolean equals(Object aObj) { + if (aObj == null) { + return false; + } + if (!(aObj instanceof Id)) { + return false; + } + return id == ((Id) aObj).id; + } + + @Override + public String toString() { + return id + ""; + } + + @Override + public int compareTo(org.wamblee.general.Id aId) { + return ((Long) id).compareTo((Long) aId.getId()); + } +} diff --git a/support/general/src/test/java/org/wamblee/general/IdTest.java b/support/general/src/test/java/org/wamblee/general/IdTest.java new file mode 100644 index 00000000..8a442cd5 --- /dev/null +++ b/support/general/src/test/java/org/wamblee/general/IdTest.java @@ -0,0 +1,45 @@ +/* + * Copyright 2005-2010 the original author or authors. + * + * Licensed 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.wamblee.general; + +import static junit.framework.Assert.*; + +import org.junit.Test; + +public class IdTest { + + @Test + public void testGetSet() { + Id id = new Id(100L); + assertEquals(100L, id.getId()); + } + + @Test + public void testEqualsHashCodeCompare() { + Id id1 = new Id(100L); + Id id2 = new Id(200L); + Id id3 = new Id(100L); + assertEquals(id1, id3); + assertFalse(id1.equals(id2)); + assertFalse(id1.equals(null)); + assertFalse(id1.equals("hello")); + assertEquals(id1.hashCode(), id3.hashCode()); + + assertTrue(id1.compareTo(id2) < 0); + assertTrue(id2.compareTo(id1) > 0); + assertEquals(0, id1.compareTo(id3)); + } +}