001: /* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com
002:
003: This file is part of the db4o open source object database.
004:
005: db4o is free software; you can redistribute it and/or modify it under
006: the terms of version 2 of the GNU General Public License as published
007: by the Free Software Foundation and as clarified by db4objects' GPL
008: interpretation policy, available at
009: http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
010: Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
011: Suite 350, San Mateo, CA 94403, USA.
012:
013: db4o is distributed in the hope that it will be useful, but WITHOUT ANY
014: WARRANTY; without even the implied warranty of MERCHANTABILITY or
015: FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
016: for more details.
017:
018: You should have received a copy of the GNU General Public License along
019: with this program; if not, write to the Free Software Foundation, Inc.,
020: 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
021: package com.db4o.internal;
022:
023: import java.lang.ref.*;
024:
025: import com.db4o.*;
026: import com.db4o.config.*;
027: import com.db4o.foundation.*;
028: import com.db4o.internal.handlers.*;
029: import com.db4o.internal.handlers.net.*;
030: import com.db4o.reflect.generic.*;
031: import com.db4o.types.*;
032:
033: class JDK_1_2 extends JDKReflect {
034:
035: JDK_1_2() {
036: }
037:
038: public Class loadClass(String className, Object loader)
039: throws ClassNotFoundException {
040: if (loader == null) {
041: loader = getClass().getClassLoader();
042: }
043: return Class.forName(className, false, (ClassLoader) loader);
044: }
045:
046: public static void link() {
047: // link standard translators, so they won't get deleted
048: // by deployment
049:
050: new TCollection();
051: new TMap();
052: new TSerializable();
053: new TTreeMap();
054: new TTreeSet();
055: }
056:
057: Db4oCollections collections(Transaction transaction) {
058: return new P2Collections(transaction);
059: }
060:
061: Object createReferenceQueue() {
062: return new ReferenceQueue4();
063: }
064:
065: public Object createWeakReference(Object obj) {
066: return new WeakReference(obj);
067: }
068:
069: Object createActivateObjectReference(Object a_queue,
070: ObjectReference a_yapObject, Object a_object) {
071: return new ActiveObjectReference(a_queue, a_yapObject, a_object);
072: }
073:
074: Object getContextClassLoader() {
075: return Thread.currentThread().getContextClassLoader();
076: }
077:
078: void forEachCollectionElement(Object a_object, Visitor4 a_visitor) {
079: java.util.Iterator i = null;
080: if (a_object instanceof java.util.Collection) {
081: i = ((java.util.Collection) a_object).iterator();
082: } else if (a_object instanceof java.util.Map) {
083: i = ((java.util.Map) a_object).keySet().iterator();
084: }
085: if (i != null) {
086: while (i.hasNext()) {
087: a_visitor.visit(i.next());
088: }
089: }
090: }
091:
092: Object getYapRefObject(Object a_object) {
093: if (a_object instanceof ActiveObjectReference) {
094: return ((ActiveObjectReference) a_object).get();
095: }
096: return a_object;
097: }
098:
099: boolean isCollectionTranslator(Config4Class a_config) {
100: if (a_config != null) {
101: ObjectTranslator ot = a_config.getTranslator();
102: if (ot != null) {
103: return ot instanceof TCollection || ot instanceof TMap
104: || ot instanceof THashtable;
105: }
106: }
107: return false;
108: }
109:
110: public int ver() {
111: return 2;
112: }
113:
114: void killYapRef(Object obj) {
115: if (obj instanceof ActiveObjectReference) {
116: ((ActiveObjectReference) obj)._referent = null;
117: }
118: }
119:
120: void pollReferenceQueue(ObjectContainerBase container,
121: Object referenceQueue) {
122: if (referenceQueue != null) {
123: ReferenceQueue4 queue = (ReferenceQueue4) referenceQueue;
124: ActiveObjectReference ref;
125: synchronized (container.lock()) {
126: while ((ref = queue.yapPoll()) != null) {
127: container
128: .removeFromAllReferenceSystems(ref._referent);
129: }
130: }
131: }
132: }
133:
134: public void registerCollections(GenericReflector reflector) {
135: reflector.registerCollection(java.util.Collection.class);
136: reflector.registerCollection(java.util.Map.class);
137: reflector.registerCollectionUpdateDepth(java.util.Map.class, 3);
138: }
139:
140: void setAccessible(Object a_accessible) {
141: try {
142: ((java.lang.reflect.AccessibleObject) a_accessible)
143: .setAccessible(true);
144: } catch (SecurityException e) {
145:
146: }
147: }
148:
149: public NetTypeHandler[] types(ObjectContainerBase container) {
150: return new NetTypeHandler[] { new NetDateTime(container),
151: new NetDecimal(container), new NetSByte(container),
152: new NetUInt(container), new NetULong(container),
153: new NetUShort(container) };
154: }
155:
156: public Object weakReferenceTarget(Object weakRef) {
157: if (weakRef instanceof WeakReference) {
158: return ((WeakReference) weakRef).get();
159: }
160: return weakRef;
161: }
162:
163: }
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