/*-
* 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 java.lang.reflect.Array;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.Set;
import com.sleepycat.compat.DbCompat;
import com.sleepycat.db.DatabaseEntry;
import com.sleepycat.persist.model.EntityModel;
import com.sleepycat.persist.raw.RawObject;
/**
* An array of objects having a specified number of dimensions. All
* multidimensional arrays are handled by this class, since even a primitive
* array of more than one dimension is an array of objects, where the component
* objects may be primitive arrays. The {@link PrimitiveArrayFormat} class
* handles primitive arrays of one dimension only.
*
* In this class, and {@link PrimitiveArrayFormat}, we resort to using
* reflection to allocate multidimensional arrays. If there is a need for it,
* reflection could be avoided in the future by generating code as new array
* formats are encountered.
*
* @author Mark Hayes
*/
public class ObjectArrayFormat extends Format {
private static final long serialVersionUID = 4317004346690441892L;
private Format componentFormat;
private int nDimensions;
private transient Format useComponentFormat;
ObjectArrayFormat(Catalog catalog, Class type) {
super(catalog, type);
String name = getClassName();
for (nDimensions = 0;
name.charAt(nDimensions) == '[';
nDimensions += 1) {
}
}
@Override
public boolean isArray() {
return true;
}
@Override
public int getDimensions() {
return nDimensions;
}
@Override
public Format getComponentType() {
return (useComponentFormat != null) ?
useComponentFormat : componentFormat;
}
@Override
void collectRelatedFormats(Catalog catalog,
Map<String, Format> newFormats) {
Class cls = getType().getComponentType();
catalog.createFormat(cls, newFormats);
}
@Override
void initialize(Catalog catalog, EntityModel model, int initVersion) {
/* Set the component format for a new (never initialized) format. */
if (componentFormat == null) {
Class cls = getType().getComponentType();
componentFormat = catalog.getFormat(cls.getName());
}
useComponentFormat = componentFormat.getLatestVersion();
}
@Override
boolean isAssignableTo(Format format) {
if (super.isAssignableTo(format)) {
return true;
}
if (format instanceof ObjectArrayFormat) {
ObjectArrayFormat other = (ObjectArrayFormat) format;
if (useComponentFormat.isAssignableTo(other.useComponentFormat)) {
return true;
}
}
return false;
}
@Override
Object newArray(int len) {
return Array.newInstance(getType(), len);
}
@Override
public Object newInstance(EntityInput input, boolean rawAccess) {
int len = input.readArrayLength();
if (rawAccess) {
return new RawObject(this, new Object[len]);
} else {
return useComponentFormat.newArray(len);
}
}
@Override
public Object readObject(Object o, EntityInput input, boolean rawAccess)
throws RefreshException {
Object[] a;
if (rawAccess) {
a = ((RawObject) o).getElements();
} else {
a = (Object[]) o;
}
if (useComponentFormat.getId() == Format.ID_STRING) {
for (int i = 0; i < a.length; i += 1) {
a[i] = input.readStringObject();
}
} else {
for (int i = 0; i < a.length; i += 1) {
a[i] = input.readObject();
}
}
return o;
}
@Override
void writeObject(Object o, EntityOutput output, boolean rawAccess)
throws RefreshException {
Object[] a;
if (rawAccess) {
a = ((RawObject) o).getElements();
} else {
a = (Object[]) o;
}
output.writeArrayLength(a.length);
if (useComponentFormat.getId() == Format.ID_STRING) {
for (int i = 0; i < a.length; i += 1) {
output.writeString((String)a[i]);
}
} else {
for (int i = 0; i < a.length; i += 1) {
output.writeObject(a[i], useComponentFormat);
}
}
}
@Override
Object convertRawObject(Catalog catalog,
boolean rawAccess,
RawObject rawObject,
IdentityHashMap converted)
throws RefreshException {
RawArrayInput input = new RawArrayInput
(catalog, rawAccess, converted, rawObject, useComponentFormat);
Object a = newInstance(input, rawAccess);
converted.put(rawObject, a);
return readObject(a, input, rawAccess);
}
@Override
void skipContents(RecordInput input)
throws RefreshException {
int len = input.readPackedInt();
for (int i = 0; i < len; i += 1) {
input.skipField(useComponentFormat);
}
}
@Override
void copySecMultiKey(RecordInput input, Format keyFormat, Set results)
throws RefreshException {
int len = input.readPackedInt();
for (int i = 0; i < len; i += 1) {
KeyLocation loc = input.getKeyLocation(useComponentFormat);
if (loc == null) {
throw new IllegalArgumentException
("Secondary key values in array may not be null");
}
if (loc.format != useComponentFormat) {
throw DbCompat.unexpectedState
(useComponentFormat.getClassName());
}
int off1 = loc.input.getBufferOffset();
useComponentFormat.skipContents(loc.input);
int off2 = loc.input.getBufferOffset();
DatabaseEntry entry = new DatabaseEntry
(loc.input.getBufferBytes(), off1, off2 - off1);
results.add(entry);
}
}
@Override
boolean evolve(Format newFormat, Evolver evolver) {
/*
* When the class name of the component changes, we need a new format
* that references it. Otherwise, don't propogate changes from
* components upward to their arrays.
*/
Format latest = componentFormat.getLatestVersion();
if (latest != componentFormat &&
!latest.getClassName().equals(componentFormat.getClassName())) {
evolver.useEvolvedFormat(this, newFormat, newFormat);
} else {
evolver.useOldFormat(this, newFormat);
}
return true;
}
}