| /* |
| * Copyright 2005 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. |
| */ |
| |
| /* |
| * CharIdentity.java |
| * |
| */ |
| |
| package javax.jdo.identity; |
| |
| import java.io.IOException; |
| import java.io.ObjectInput; |
| import java.io.ObjectOutput; |
| |
| import javax.jdo.spi.I18NHelper; |
| |
| /** This class is for identity with a single character field. |
| * @version 2.0 |
| */ |
| public class CharIdentity extends SingleFieldIdentity { |
| |
| /** The Internationalization message helper. |
| */ |
| private static I18NHelper msg = I18NHelper.getInstance ("javax.jdo.Bundle"); //NOI18N |
| |
| /** The key. |
| */ |
| private char key; |
| |
| private void construct(char key) { |
| this.key = key; |
| hashCode = hashClassName() ^ key; |
| } |
| |
| /** Constructor with class and key. |
| * @param pcClass the target class |
| * @param key the key |
| */ |
| public CharIdentity (Class pcClass, char key) { |
| super (pcClass); |
| construct(key); |
| } |
| |
| /** Constructor with class and key. |
| * @param pcClass the target class |
| * @param key the key |
| */ |
| public CharIdentity (Class pcClass, Character key) { |
| super (pcClass); |
| setKeyAsObject(key); |
| construct(key.charValue()); |
| } |
| |
| /** Constructor with class and key. The String must have exactly one |
| * character. |
| * @param pcClass the target class |
| * @param str the key |
| */ |
| public CharIdentity (Class pcClass, String str) { |
| super(pcClass); |
| assertKeyNotNull(str); |
| if (str.length() != 1) |
| throw new IllegalArgumentException( |
| msg.msg("EXC_StringWrongLength")); //NOI18N |
| construct(str.charAt(0)); |
| } |
| |
| /** Constructor only for Externalizable. |
| */ |
| public CharIdentity () { |
| } |
| |
| /** Return the key. |
| * @return the key |
| */ |
| public char getKey () { |
| return key; |
| } |
| |
| /** Return the String form of the key. |
| * @return the String form of the key |
| */ |
| public String toString () { |
| return String.valueOf(key); |
| } |
| |
| /** Determine if the other object represents the same object id. |
| * @param obj the other object |
| * @return true if both objects represent the same object id |
| */ |
| public boolean equals (Object obj) { |
| if (this == obj) { |
| return true; |
| } else if (!super.equals (obj)) { |
| return false; |
| } else { |
| CharIdentity other = (CharIdentity) obj; |
| return key == other.key; |
| } |
| } |
| |
| /** Create the key as an Object. |
| * @return the key as an Object |
| * @since 2.0 |
| */ |
| protected Object createKeyAsObject() { |
| return new Character(key); |
| } |
| |
| /** Write this object. Write the superclass first. |
| * @param out the output |
| */ |
| public void writeExternal(ObjectOutput out) throws IOException { |
| super.writeExternal (out); |
| out.writeChar(key); |
| } |
| |
| /** Read this object. Read the superclass first. |
| * @param in the input |
| */ |
| public void readExternal(ObjectInput in) |
| throws IOException, ClassNotFoundException { |
| super.readExternal (in); |
| key = in.readChar(); |
| } |
| |
| private void computeHashCode() { |
| hashCode = hashClassName() ^ key; |
| } |
| } |