diff options
Diffstat (limited to 'framework/src/onos/utils/misc')
-rw-r--r-- | framework/src/onos/utils/misc/src/main/java/org/onlab/util/DefaultHashMap.java | 42 | ||||
-rw-r--r-- | framework/src/onos/utils/misc/src/test/java/org/onlab/util/DefaultHashMapTest.java | 81 |
2 files changed, 123 insertions, 0 deletions
diff --git a/framework/src/onos/utils/misc/src/main/java/org/onlab/util/DefaultHashMap.java b/framework/src/onos/utils/misc/src/main/java/org/onlab/util/DefaultHashMap.java new file mode 100644 index 00000000..f9d878ab --- /dev/null +++ b/framework/src/onos/utils/misc/src/main/java/org/onlab/util/DefaultHashMap.java @@ -0,0 +1,42 @@ +/* + * Copyright 2015 Open Networking Laboratory + * + * 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.onlab.util; + +import java.util.HashMap; + +/** + * HashMap that returns a default value for unmapped keys. + */ +public class DefaultHashMap<K, V> extends HashMap<K, V> { + + /** Default value to return when no key binding exists. */ + protected V defaultValue; + + /** + * Constructs an empty map with the given default value. + * + * @param defaultValue the default value + */ + public DefaultHashMap(V defaultValue) { + this.defaultValue = defaultValue; + } + + @Override + public V get(Object k) { + return containsKey(k) ? super.get(k) : defaultValue; + } +}
\ No newline at end of file diff --git a/framework/src/onos/utils/misc/src/test/java/org/onlab/util/DefaultHashMapTest.java b/framework/src/onos/utils/misc/src/test/java/org/onlab/util/DefaultHashMapTest.java new file mode 100644 index 00000000..db6b5fb7 --- /dev/null +++ b/framework/src/onos/utils/misc/src/test/java/org/onlab/util/DefaultHashMapTest.java @@ -0,0 +1,81 @@ +/* + * Copyright 2015 Open Networking Laboratory + * + * 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.onlab.util; + +import org.junit.Test; + +import static org.junit.Assert.assertEquals; + +/** + * Unit tests for {@link DefaultHashMap}. + */ +public class DefaultHashMapTest { + + private static final String ONE = "one"; + private static final String TWO = "two"; + private static final String THREE = "three"; + private static final String FOUR = "four"; + + private static final String ALPHA = "Alpha"; + private static final String BETA = "Beta"; + private static final String OMEGA = "Omega"; + + private DefaultHashMap<String, Integer> map; + private DefaultHashMap<String, String> chartis; + + private void loadMap() { + map.put(ONE, 1); + map.put(TWO, 2); + } + + private void fortioCharti() { + chartis.put(ONE, ALPHA); + chartis.put(TWO, BETA); + } + + @Test + public void nullDefaultIsAllowed() { + // but makes this class behave no different than HashMap + map = new DefaultHashMap<>(null); + loadMap(); + assertEquals("missing 1", 1, (int) map.get(ONE)); + assertEquals("missing 2", 2, (int) map.get(TWO)); + assertEquals("three?", null, map.get(THREE)); + assertEquals("four?", null, map.get(FOUR)); + } + + @Test + public void defaultToFive() { + map = new DefaultHashMap<>(5); + loadMap(); + assertEquals("missing 1", 1, (int) map.get(ONE)); + assertEquals("missing 2", 2, (int) map.get(TWO)); + assertEquals("three?", 5, (int) map.get(THREE)); + assertEquals("four?", 5, (int) map.get(FOUR)); + } + + @Test + public void defaultToOmega() { + chartis = new DefaultHashMap<>(OMEGA); + fortioCharti(); + assertEquals("missing 1", ALPHA, chartis.get(ONE)); + assertEquals("missing 2", BETA, chartis.get(TWO)); + assertEquals("three?", OMEGA, chartis.get(THREE)); + assertEquals("four?", OMEGA, chartis.get(FOUR)); + } + +} |