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Diffstat (limited to 'qpid/java/client/src/main/java/org/apache/qpid/collections/keyvalue/AbstractMapEntry.java')
| -rw-r--r-- | qpid/java/client/src/main/java/org/apache/qpid/collections/keyvalue/AbstractMapEntry.java | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/qpid/java/client/src/main/java/org/apache/qpid/collections/keyvalue/AbstractMapEntry.java b/qpid/java/client/src/main/java/org/apache/qpid/collections/keyvalue/AbstractMapEntry.java new file mode 100644 index 0000000000..f4717a1c20 --- /dev/null +++ b/qpid/java/client/src/main/java/org/apache/qpid/collections/keyvalue/AbstractMapEntry.java @@ -0,0 +1,96 @@ +/* + * Copyright 2003-2006 The Apache Software Foundation + * + * 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.apache.qpid.collections.keyvalue; + +import java.util.Map; + +import org.apache.qpid.collections.keyvalue.AbstractKeyValue; + +/** + * Abstract Pair class to assist with creating correct + * {@link java.util.Map.Entry Map.Entry} implementations. + * + * @since Commons Collections 3.0 + * @version $Revision$ $Date$ + * + * @author James Strachan + * @author Michael A. Smith + * @author Neil O'Toole + * @author Stephen Colebourne + */ +public abstract class AbstractMapEntry extends AbstractKeyValue implements Map.Entry { + + /** + * Constructs a new entry with the given key and given value. + * + * @param key the key for the entry, may be null + * @param value the value for the entry, may be null + */ + protected AbstractMapEntry(Object key, Object value) { + super(key, value); + } + + // Map.Entry interface + //------------------------------------------------------------------------- + /** + * Sets the value stored in this <code>Map.Entry</code>. + * <p> + * This <code>Map.Entry</code> is not connected to a Map, so only the + * local data is changed. + * + * @param value the new value + * @return the previous value + */ + public Object setValue(Object value) { + Object answer = this.value; + this.value = value; + return answer; + } + + /** + * Compares this <code>Map.Entry</code> with another <code>Map.Entry</code>. + * <p> + * Implemented per API documentation of {@link java.util.Map.Entry#equals(Object)} + * + * @param obj the object to compare to + * @return true if equal key and value + */ + public boolean equals(Object obj) { + if (obj == this) { + return true; + } + if (obj instanceof Map.Entry == false) { + return false; + } + Map.Entry other = (Map.Entry) obj; + return + (getKey() == null ? other.getKey() == null : getKey().equals(other.getKey())) && + (getValue() == null ? other.getValue() == null : getValue().equals(other.getValue())); + } + + /** + * Gets a hashCode compatible with the equals method. + * <p> + * Implemented per API documentation of {@link java.util.Map.Entry#hashCode()} + * + * @return a suitable hash code + */ + public int hashCode() { + return (getKey() == null ? 0 : getKey().hashCode()) ^ + (getValue() == null ? 0 : getValue().hashCode()); + } + +}
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