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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.openjpa.util;
import java.security.AccessController;
import org.apache.openjpa.conf.OpenJPAConfiguration;
import org.apache.openjpa.lib.util.J2DoPrivHelper;
import org.apache.openjpa.lib.util.Localizer;
import serp.util.Numbers;
/**
* Datastore identity type. Implementations may choose to use this type,
* or choose to use their own datastore identity values.
*
* @author Abe White
*/
public final class Id
extends OpenJPAId {
private static final Localizer _loc = Localizer.forPackage(Id.class);
private final long _id;
/**
* Create an id from the given type and value; the value might be an
* id instnace, a stringified id, or a primary key value.
*/
public static Id newInstance(Class cls, Object val) {
if (val instanceof Id)
return (Id) val;
if (val instanceof String)
return new Id(cls, (String) val);
if (val instanceof Number)
return new Id(cls, ((Number) val).longValue());
if (val == null)
return new Id(cls, 0L);
throw new UserException(_loc.get("unknown-oid", cls, val,
val.getClass()));
}
/**
* Create an id from the result of a {@link #toString} call on another
* instance.
*/
public Id(String str) {
this(str, (ClassLoader) null);
}
/**
* Create an id from the result of an {@link #toString} call on another
* instance.
*/
public Id(String str, OpenJPAConfiguration conf, ClassLoader brokerLoader) {
this(str, (conf == null) ? brokerLoader : conf.
getClassResolverInstance().getClassLoader(Id.class, brokerLoader));
}
/**
* Create an id from the result of an {@link #toString} call on another
* instance.
*/
public Id(String str, ClassLoader loader) {
if (loader == null)
loader = (ClassLoader) AccessController.doPrivileged(
J2DoPrivHelper.getContextClassLoaderAction());
if (str == null)
_id = 0L;
else {
int dash = str.indexOf('-');
try {
type = Class.forName(str.substring(0, dash), true, loader);
} catch (Throwable t) {
throw new UserException(_loc.get("string-id", str), t);
}
_id = Long.parseLong(str.substring(dash + 1));
}
}
/**
* Construct from the result of a {@link #toString} call on another
* instance.
*/
public Id(Class cls, String key) {
super(cls);
if (key == null)
_id = 0L;
else {
// allow either stringified long or result of Id.toString
int dash = key.indexOf('-');
if (dash > 0) // don't check for -1; might be negative number
key = key.substring(dash + 1);
_id = Long.parseLong(key);
}
}
/**
* Construct from key value.
*/
public Id(Class cls, Long key) {
this(cls, (key == null) ? 0L : key.longValue());
}
/**
* Construct from key value.
*/
public Id(Class cls, long key) {
super(cls);
_id = key;
}
/**
* Construct from key value.
*/
public Id(Class cls, long key, boolean subs) {
super(cls, subs);
_id = key;
}
/**
* Primary key.
*/
public long getId() {
return _id;
}
public Object getIdObject() {
return Numbers.valueOf(_id);
}
protected int idHash() {
return (int) (_id ^ (_id >>> 32));
}
protected boolean idEquals(OpenJPAId other) {
return _id == ((Id) other)._id;
}
}
