001: //$Id: BasicLazyInitializer.java 9210 2006-02-03 22:15:19Z steveebersole $
002: package org.hibernate.proxy.pojo;
003:
004: import java.io.Serializable;
005: import java.lang.reflect.Method;
006:
007: import org.hibernate.engine.EntityKey;
008: import org.hibernate.engine.SessionImplementor;
009: import org.hibernate.type.AbstractComponentType;
010: import org.hibernate.util.MarkerObject;
011: import org.hibernate.util.ReflectHelper;
012: import org.hibernate.proxy.AbstractLazyInitializer;
013:
014: /**
015: * Lazy initializer for POJOs
016: * @author Gavin King
017: */
018: public abstract class BasicLazyInitializer extends
019: AbstractLazyInitializer {
020:
021: protected static final Object INVOKE_IMPLEMENTATION = new MarkerObject(
022: "INVOKE_IMPLEMENTATION");
023:
024: protected Class persistentClass;
025: protected Method getIdentifierMethod;
026: protected Method setIdentifierMethod;
027: protected boolean overridesEquals;
028: private Object replacement;
029: protected AbstractComponentType componentIdType;
030:
031: protected BasicLazyInitializer(String entityName,
032: Class persistentClass, Serializable id,
033: Method getIdentifierMethod, Method setIdentifierMethod,
034: AbstractComponentType componentIdType,
035: SessionImplementor session) {
036: super (entityName, id, session);
037: this .persistentClass = persistentClass;
038: this .getIdentifierMethod = getIdentifierMethod;
039: this .setIdentifierMethod = setIdentifierMethod;
040: this .componentIdType = componentIdType;
041: overridesEquals = ReflectHelper
042: .overridesEquals(persistentClass);
043: }
044:
045: protected abstract Object serializableProxy();
046:
047: protected final Object invoke(Method method, Object[] args,
048: Object proxy) throws Throwable {
049:
050: String methodName = method.getName();
051: int params = args.length;
052:
053: if (params == 0) {
054:
055: if ("writeReplace".equals(methodName)) {
056: return getReplacement();
057: } else if (!overridesEquals
058: && "hashCode".equals(methodName)) {
059: return new Integer(System.identityHashCode(proxy));
060: } else if (isUninitialized()
061: && method.equals(getIdentifierMethod)) {
062: return getIdentifier();
063: }
064:
065: else if ("getHibernateLazyInitializer".equals(methodName)) {
066: return this ;
067: }
068:
069: } else if (params == 1) {
070:
071: if (!overridesEquals && "equals".equals(methodName)) {
072: return args[0] == proxy ? Boolean.TRUE : Boolean.FALSE;
073: } else if (method.equals(setIdentifierMethod)) {
074: initialize();
075: setIdentifier((Serializable) args[0]);
076: return INVOKE_IMPLEMENTATION;
077: }
078:
079: }
080:
081: //if it is a property of an embedded component, invoke on the "identifier"
082: if (componentIdType != null
083: && componentIdType.isMethodOf(method)) {
084: return method.invoke(getIdentifier(), args);
085: }
086:
087: // otherwise:
088: return INVOKE_IMPLEMENTATION;
089:
090: }
091:
092: private Object getReplacement() {
093:
094: final SessionImplementor session = getSession();
095: if (isUninitialized() && session != null && session.isOpen()) {
096: final EntityKey key = new EntityKey(getIdentifier(),
097: session.getFactory().getEntityPersister(
098: getEntityName()), session.getEntityMode());
099: final Object entity = session.getPersistenceContext()
100: .getEntity(key);
101: if (entity != null)
102: setImplementation(entity);
103: }
104:
105: if (isUninitialized()) {
106: if (replacement == null) {
107: replacement = serializableProxy();
108: }
109: return replacement;
110: } else {
111: return getTarget();
112: }
113:
114: }
115:
116: public final Class getPersistentClass() {
117: return persistentClass;
118: }
119:
120: }
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