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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2002, 2015 Oracle and/or its affiliates. All rights reserved.
*
*/
package com.sleepycat.persist.impl;
import com.sleepycat.bind.EntryBinding;
import com.sleepycat.bind.tuple.TupleBase;
import com.sleepycat.compat.DbCompat;
import com.sleepycat.db.DatabaseEntry;
/**
* A persistence key binding for a given key class.
*
* @author Mark Hayes
*/
public class PersistKeyBinding implements EntryBinding {
/* See Store.refresh for an explanation of the use of volatile fields. */
volatile Catalog catalog;
volatile Format keyFormat;
final boolean rawAccess;
/**
* Creates a key binding for a given key class.
*/
public PersistKeyBinding(Catalog catalogParam,
String clsName,
boolean rawAccess) {
catalog = catalogParam;
try {
keyFormat = PersistEntityBinding.getOrCreateFormat
(catalog, clsName, rawAccess);
} catch (RefreshException e) {
/* Must assign catalog field in constructor. */
catalog = e.refresh();
try {
keyFormat = PersistEntityBinding.getOrCreateFormat
(catalog, clsName, rawAccess);
} catch (RefreshException e2) {
throw DbCompat.unexpectedException(e2);
}
}
if (!keyFormat.isSimple() &&
!keyFormat.isEnum() &&
!(keyFormat.getClassMetadata() != null &&
keyFormat.getClassMetadata().getCompositeKeyFields() != null)) {
throw new IllegalArgumentException
("Key class is not a simple type, an enum, or a composite " +
"key class (composite keys must include @KeyField " +
"annotations): " +
clsName);
}
this.rawAccess = rawAccess;
}
/**
* Creates a key binding dynamically for use by PersistComparator. Formats
* are created from scratch rather than using a shared catalog.
*/
PersistKeyBinding(final Catalog catalog,
final Class cls,
final String[] compositeFieldOrder) {
this.catalog = catalog;
keyFormat = new CompositeKeyFormat(catalog, cls, compositeFieldOrder);
keyFormat.initializeIfNeeded(catalog, null /*model*/);
rawAccess = false;
}
/**
* Binds bytes to an object for use by PersistComparator as well as
* entryToObject.
*/
Object bytesToObject(byte[] bytes, int offset, int length)
throws RefreshException {
return readKey(keyFormat, catalog, bytes, offset, length, rawAccess);
}
/**
* Binds bytes to an object for use by PersistComparator as well as
* entryToObject.
*/
static Object readKey(Format keyFormat,
Catalog catalog,
byte[] bytes,
int offset,
int length,
boolean rawAccess)
throws RefreshException {
EntityInput input = new RecordInput
(catalog, rawAccess, null, 0, bytes, offset, length);
return input.readKeyObject(keyFormat);
}
public Object entryToObject(DatabaseEntry entry) {
try {
return entryToObjectInternal(entry);
} catch (RefreshException e) {
e.refresh();
try {
return entryToObjectInternal(entry);
} catch (RefreshException e2) {
throw DbCompat.unexpectedException(e2);
}
}
}
private Object entryToObjectInternal(DatabaseEntry entry)
throws RefreshException {
return bytesToObject
(entry.getData(), entry.getOffset(), entry.getSize());
}
public void objectToEntry(Object object, DatabaseEntry entry) {
try {
objectToEntryInternal(object, entry);
} catch (RefreshException e) {
e.refresh();
try {
objectToEntryInternal(object, entry);
} catch (RefreshException e2) {
throw DbCompat.unexpectedException(e2);
}
}
}
private void objectToEntryInternal(Object object, DatabaseEntry entry)
throws RefreshException {
RecordOutput output = new RecordOutput(catalog, rawAccess);
output.writeKeyObject(object, keyFormat);
TupleBase.outputToEntry(output, entry);
}
/**
* See Store.refresh.
*/
void refresh(final PersistCatalog newCatalog) {
catalog = newCatalog;
keyFormat = catalog.getFormat(keyFormat.getClassName());
}
}
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