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Lightweight Object Relational Model (ORM) Android classes
package com.j256.ormlite.android;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import com.j256.ormlite.db.DatabaseType;
import com.j256.ormlite.field.DataPersister;
import com.j256.ormlite.field.DataType;
import com.j256.ormlite.field.DatabaseField;
import com.j256.ormlite.field.DatabaseFieldConfig;
import com.j256.ormlite.support.ConnectionSource;
import com.j256.ormlite.table.DatabaseTableConfig;
/**
* Class which uses reflection to make the job of processing the {@link DatabaseField} annotation more efficient. In
* current (as of 11/2011) versions of Android, Annotations are ghastly slow. This uses reflection on the Android
* classes to work around this issue. Gross and a hack but a significant (~20x) performance improvement.
*
*
* Thanks much go to Josh Guilfoyle for the idea and the code framework to make this happen.
*
*
* @author joshguilfoyle, graywatson
*/
public class DatabaseTableConfigUtil {
private static Class annotationFactoryClazz;
private static Field elementsField;
private static Class annotationMemberClazz;
private static Field nameField;
private static Field valueField;
private static int workedC = 0;
private static final int[] configFieldNums = lookupClasses();
/**
* Build our list table config from a class using some annotation fu around.
*/
public static DatabaseTableConfig fromClass(ConnectionSource connectionSource, Class clazz)
throws SQLException {
DatabaseType databaseType = connectionSource.getDatabaseType();
String tableName = DatabaseTableConfig.extractTableName(clazz);
List fieldConfigs = new ArrayList();
for (Class classWalk = clazz; classWalk != null; classWalk = classWalk.getSuperclass()) {
for (Field field : classWalk.getDeclaredFields()) {
DatabaseFieldConfig config = configFromField(databaseType, tableName, field);
if (config != null && config.isPersisted()) {
fieldConfigs.add(config);
}
}
}
if (fieldConfigs.size() == 0) {
return null;
} else {
return new DatabaseTableConfig(clazz, tableName, fieldConfigs);
}
}
/**
* Return the number of fields configured using our reflection hack. This is for testing.
*/
public static int getWorkedC() {
return workedC;
}
/**
* This does all of the class reflection fu to find our classes, find the order of field names, and construct our
* array of ConfigField entries the correspond to the AnnotationMember array.
*/
private static int[] lookupClasses() {
Class annotationMemberArrayClazz;
try {
annotationFactoryClazz = Class.forName("org.apache.harmony.lang.annotation.AnnotationFactory");
annotationMemberClazz = Class.forName("org.apache.harmony.lang.annotation.AnnotationMember");
annotationMemberArrayClazz = Class.forName("[Lorg.apache.harmony.lang.annotation.AnnotationMember;");
} catch (ClassNotFoundException e) {
return null;
}
Field fieldField;
try {
elementsField = annotationFactoryClazz.getDeclaredField("elements");
elementsField.setAccessible(true);
nameField = annotationMemberClazz.getDeclaredField("name");
nameField.setAccessible(true);
valueField = annotationMemberClazz.getDeclaredField("value");
valueField.setAccessible(true);
fieldField = DatabaseFieldSample.class.getDeclaredField("field");
} catch (SecurityException e) {
return null;
} catch (NoSuchFieldException e) {
return null;
}
DatabaseField databaseField = fieldField.getAnnotation(DatabaseField.class);
InvocationHandler proxy = Proxy.getInvocationHandler(databaseField);
if (proxy.getClass() != annotationFactoryClazz) {
return null;
}
try {
// this should be an array of AnnotationMember objects
Object elements = elementsField.get(proxy);
if (elements == null || elements.getClass() != annotationMemberArrayClazz) {
return null;
}
Object[] elementArray = (Object[]) elements;
int[] configNums = new int[elementArray.length];
// build our array of field-numbers that match the AnnotationMember array
for (int i = 0; i < elementArray.length; i++) {
String name = (String) nameField.get(elementArray[i]);
configNums[i] = configFieldNameToNum(name);
}
return configNums;
} catch (IllegalAccessException e) {
return null;
}
}
/*
* NOTE: we are doing this instead of an enum (which otherwise would be much better) because we don't want to take
* the class-size hit that comes with each enum being its own class.
*/
private static final int COLUMN_NAME = 1;
private static final int DATA_TYPE = 2;
private static final int DEFAULT_VALUE = 3;
private static final int WIDTH = 4;
private static final int CAN_BE_NULL = 5;
private static final int ID = 6;
private static final int GENERATED_ID = 7;
private static final int GENERATED_ID_SEQUENCE = 8;
private static final int FOREIGN = 9;
private static final int USE_GET_SET = 10;
private static final int UNKNOWN_ENUM_NAME = 11;
private static final int THROW_IF_NULL = 12;
private static final int PERSISTED = 13;
private static final int FORMAT = 14;
private static final int UNIQUE = 15;
private static final int UNIQUE_COMBO = 16;
private static final int INDEX = 17;
private static final int UNIQUE_INDEX = 18;
private static final int INDEX_NAME = 19;
private static final int UNIQUE_INDEX_NAME = 20;
private static final int FOREIGN_AUTO_REFRESH = 21;
private static final int MAX_FOREIGN_AUTO_REFRESH_LEVEL = 22;
private static final int PERSISTER_CLASS = 23;
private static final int ALLOW_GENERATED_ID_INSERT = 24;
private static final int COLUMN_DEFINITON = 25;
private static final int FOREIGN_AUTO_CREATE = 26;
private static final int VERSION = 27;
private static final int FOREIGN_COLUMN_NAME = 28;
private static final int READ_ONLY = 29;
/**
* Convert the name of the @DatabaseField fields into a number for easy processing later.
*/
private static int configFieldNameToNum(String configName) {
if (configName.equals("columnName")) {
return COLUMN_NAME;
} else if (configName.equals("dataType")) {
return DATA_TYPE;
} else if (configName.equals("defaultValue")) {
return DEFAULT_VALUE;
} else if (configName.equals("width")) {
return WIDTH;
} else if (configName.equals("canBeNull")) {
return CAN_BE_NULL;
} else if (configName.equals("id")) {
return ID;
} else if (configName.equals("generatedId")) {
return GENERATED_ID;
} else if (configName.equals("generatedIdSequence")) {
return GENERATED_ID_SEQUENCE;
} else if (configName.equals("foreign")) {
return FOREIGN;
} else if (configName.equals("useGetSet")) {
return USE_GET_SET;
} else if (configName.equals("unknownEnumName")) {
return UNKNOWN_ENUM_NAME;
} else if (configName.equals("throwIfNull")) {
return THROW_IF_NULL;
} else if (configName.equals("persisted")) {
return PERSISTED;
} else if (configName.equals("format")) {
return FORMAT;
} else if (configName.equals("unique")) {
return UNIQUE;
} else if (configName.equals("uniqueCombo")) {
return UNIQUE_COMBO;
} else if (configName.equals("index")) {
return INDEX;
} else if (configName.equals("uniqueIndex")) {
return UNIQUE_INDEX;
} else if (configName.equals("indexName")) {
return INDEX_NAME;
} else if (configName.equals("uniqueIndexName")) {
return UNIQUE_INDEX_NAME;
} else if (configName.equals("foreignAutoRefresh")) {
return FOREIGN_AUTO_REFRESH;
} else if (configName.equals("maxForeignAutoRefreshLevel")) {
return MAX_FOREIGN_AUTO_REFRESH_LEVEL;
} else if (configName.equals("persisterClass")) {
return PERSISTER_CLASS;
} else if (configName.equals("allowGeneratedIdInsert")) {
return ALLOW_GENERATED_ID_INSERT;
} else if (configName.equals("columnDefinition")) {
return COLUMN_DEFINITON;
} else if (configName.equals("foreignAutoCreate")) {
return FOREIGN_AUTO_CREATE;
} else if (configName.equals("version")) {
return VERSION;
} else if (configName.equals("foreignColumnName")) {
return FOREIGN_COLUMN_NAME;
} else if (configName.equals("readOnly")) {
return READ_ONLY;
} else {
throw new IllegalStateException("Could not find support for DatabaseField " + configName);
}
}
/**
* Extract our configuration information from the field by looking for a {@link DatabaseField} annotation.
*/
private static DatabaseFieldConfig configFromField(DatabaseType databaseType, String tableName, Field field)
throws SQLException {
if (configFieldNums == null) {
return DatabaseFieldConfig.fromField(databaseType, tableName, field);
}
/*
* This, unfortunately, we can't get around. This creates a AnnotationFactory, an array of AnnotationMember
* fields, and possibly another array of AnnotationMember values. This creates a lot of GC'd objects.
*/
DatabaseField databaseField = field.getAnnotation(DatabaseField.class);
DatabaseFieldConfig config = null;
try {
if (databaseField != null) {
config = buildConfig(databaseField, tableName, field);
}
} catch (Exception e) {
// ignored so we will configure normally below
}
if (config == null) {
/*
* We configure this the old way because we might be using javax annotations, have a ForeignCollectionField,
* or may still be using the deprecated annotations. At this point we know that there isn't a @DatabaseField
* or we can't do our reflection hacks for some reason.
*/
return DatabaseFieldConfig.fromField(databaseType, tableName, field);
} else {
workedC++;
return config;
}
}
/**
* Instead of calling the annotation methods directly, we peer inside the proxy and investigate the array of
* AnnotationMember objects stored by the AnnotationFactory.
*/
private static DatabaseFieldConfig buildConfig(DatabaseField databaseField, String tableName, Field field)
throws Exception {
InvocationHandler proxy = Proxy.getInvocationHandler(databaseField);
if (proxy.getClass() != annotationFactoryClazz) {
return null;
}
// this should be an array of AnnotationMember objects
Object elementsObject = elementsField.get(proxy);
if (elementsObject == null) {
return null;
}
DatabaseFieldConfig config = new DatabaseFieldConfig(field.getName());
Object[] objs = (Object[]) elementsObject;
for (int i = 0; i < configFieldNums.length; i++) {
Object value = valueField.get(objs[i]);
if (value != null) {
assignConfigField(configFieldNums[i], config, field, value);
}
}
return config;
}
/**
* Converts from field/value from the {@link DatabaseField} annotation to {@link DatabaseFieldConfig} values. This
* is very specific to this annotation.
*/
private static void assignConfigField(int configNum, DatabaseFieldConfig config, Field field, Object value) {
switch (configNum) {
case COLUMN_NAME :
config.setColumnName(valueIfNotBlank((String) value));
break;
case DATA_TYPE :
config.setDataType((DataType) value);
break;
case DEFAULT_VALUE :
String defaultValue = (String) value;
if (!(defaultValue == null || defaultValue.equals(DatabaseField.DEFAULT_STRING))) {
config.setDefaultValue(defaultValue);
}
break;
case WIDTH :
config.setWidth((Integer) value);
break;
case CAN_BE_NULL :
config.setCanBeNull((Boolean) value);
break;
case ID :
config.setId((Boolean) value);
break;
case GENERATED_ID :
config.setGeneratedId((Boolean) value);
break;
case GENERATED_ID_SEQUENCE :
config.setGeneratedIdSequence(valueIfNotBlank((String) value));
break;
case FOREIGN :
config.setForeign((Boolean) value);
break;
case USE_GET_SET :
config.setUseGetSet((Boolean) value);
break;
case UNKNOWN_ENUM_NAME :
config.setUnknownEnumValue(DatabaseFieldConfig.findMatchingEnumVal(field, (String) value));
break;
case THROW_IF_NULL :
config.setThrowIfNull((Boolean) value);
break;
case PERSISTED :
config.setPersisted((Boolean) value);
break;
case FORMAT :
config.setFormat(valueIfNotBlank((String) value));
break;
case UNIQUE :
config.setUnique((Boolean) value);
break;
case UNIQUE_COMBO :
config.setUniqueCombo((Boolean) value);
break;
case INDEX :
config.setIndex((Boolean) value);
break;
case UNIQUE_INDEX :
config.setUniqueIndex((Boolean) value);
break;
case INDEX_NAME :
config.setIndexName(valueIfNotBlank((String) value));
break;
case UNIQUE_INDEX_NAME :
config.setUniqueIndexName(valueIfNotBlank((String) value));
break;
case FOREIGN_AUTO_REFRESH :
config.setForeignAutoRefresh((Boolean) value);
break;
case MAX_FOREIGN_AUTO_REFRESH_LEVEL :
config.setMaxForeignAutoRefreshLevel((Integer) value);
break;
case PERSISTER_CLASS :
@SuppressWarnings("unchecked")
Class clazz = (Class) value;
config.setPersisterClass(clazz);
break;
case ALLOW_GENERATED_ID_INSERT :
config.setAllowGeneratedIdInsert((Boolean) value);
break;
case COLUMN_DEFINITON :
config.setColumnDefinition(valueIfNotBlank((String) value));
break;
case FOREIGN_AUTO_CREATE :
config.setForeignAutoCreate((Boolean) value);
break;
case VERSION :
config.setVersion((Boolean) value);
break;
case FOREIGN_COLUMN_NAME :
config.setForeignColumnName(valueIfNotBlank((String) value));
break;
case READ_ONLY :
config.setReadOnly((Boolean) value);
break;
default :
throw new IllegalStateException("Could not find support for DatabaseField number " + configNum);
}
}
private static String valueIfNotBlank(String value) {
if (value == null || value.length() == 0) {
return null;
} else {
return value;
}
}
/**
* Class used to investigate the @DatabaseField annotation.
*/
private static class DatabaseFieldSample {
@SuppressWarnings("unused")
@DatabaseField
String field;
}
}