orm-java/src/main/java/com/github/artbits/orm/Reflect.java at main · artbits/orm-java · GitHub

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/**

* <p>

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

* <p>

* http://www.apache.org/licenses/LICENSE-2.0

* <p>

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

package com.github.artbits.orm;

import java.lang.reflect.Field;

import java.sql.ResultSet;

import java.sql.ResultSetMetaData;

import java.util.HashMap;

import java.util.LinkedHashMap;

import java.util.Map;

import java.util.function.BiConsumer;

import java.util.function.Consumer;

final class Reflect<T> {

private final Map<String, Field> fieldMap = new LinkedHashMap<>();

private Class<?> tClass;

private T t;

Reflect(Class<?> tClass) {

this.tClass = tClass;

newInstance(tClass);

}

Reflect(T t) {

this.t = t;

newInstance(t.getClass());

}

private void newInstance(Class<?> tClass) {

Class<?> clazz = tClass;

while (clazz != null){

for (Field field : clazz.getDeclaredFields()) {

field.setAccessible(true);

if (!isIgnore(field)) {

fieldMap.put(field.getName(), field);

}

clazz = clazz.getSuperclass();

}

void setValue(String fieldName, Object value) {

try {

Field field = fieldMap.getOrDefault(fieldName, null);

if (field != null) {

field.set(t, value);

}

} catch (IllegalAccessException e) {

throw new RuntimeException(e);

}

Object getValue(String fieldName) {

try {

Field field = fieldMap.getOrDefault(fieldName, null);

return (field != null) ? field.get(t) : null;

} catch (IllegalAccessException e) {

throw new RuntimeException(e);

}

Class<?> getType(String fieldName) {

Field field = fieldMap.getOrDefault(fieldName, null);

return field.getType();

}

String getDatabaseType(String fieldName) {

String type = getType(fieldName).getSimpleName().toLowerCase();

if (Core.config.type() == Config.Type.SQLite) {

switch (type) {

case "byte":

case "short":

case "int":

case "integer":

case "long":

case "boolean": return "integer";

case "float":

case "double": return "real";

case "char":

case "character":

case "string": return "text";

default: throw new NullPointerException();

}

} else if (Core.config.type() == Config.Type.MySQL) {

switch (type) {

case "byte": return "tinyint";

case "short": return "smallint";

case "int":

case "integer": return "int";

case "long": return "bigint";

case "float": return "float";

case "double": return "double";

case "char":

case "character":

case "string": return "text";

case "boolean": return "boolean";

default: throw new NullPointerException();

}

} else if (Core.config.type() == Config.Type.PostgreSQL) {

switch (type) {

case "byte":

case "short": return "smallint";

case "int":

case "integer": return "int";

case "long": return "bigint";

case "float": return "real";

case "double": return "double precision";

case "char":

case "character":

case "string": return "text";

case "boolean": return "boolean";

default: throw new NullPointerException();

}

} else {

throw new RuntimeException("Unsupported database type.");

}

Object getDatabaseValue(Field field) {

try {

String fieldName = field.getName();

Field dbField = fieldMap.getOrDefault(fieldName, null);

Object dbValue = (dbField != null) ? dbField.get(t) : null;

if (dbField != null && dbValue != null) {

return getDatabaseType(fieldName).equals("text") ? String.format("'%s'", dbValue) : dbValue;

}

return null;

} catch (IllegalAccessException e) {

throw new RuntimeException(e);

}

void getDatabaseColumnsWithValue(BiConsumer<String, Object> consumer) {

for (Field field : fieldMap.values()) {

consumer.accept(field.getName(), getDatabaseValue(field));

}

void getDatabaseColumnsWithType(BiConsumer<String, String> consumer) {

for (Field field : fieldMap.values()) {

consumer.accept(field.getName(), getDatabaseType(field.getName()));

}

void getIndexList(BiConsumer<String, String> consumer) {

String table = tClass.getSimpleName().toLowerCase();

fieldMap.values().forEach(field -> {

if (isIndex(field)) {

String column = field.getName();

String index = String.format("idx_%s_%s", table, column);

consumer.accept(index, column);

}

});

}

T get() {

return t;

}

static <T> T toEntity(Class<T> tClass, ResultSet resultSet) {

try {

Map<String, Boolean> columnsMap = new HashMap<>();

ResultSetMetaData metaData = resultSet.getMetaData();

int count = metaData.getColumnCount();

for (int i = 1; i <= count; i++) {

columnsMap.put(metaData.getColumnName(i), true);

}

T t = tClass.getConstructor(Consumer.class).newInstance((Consumer<T>) (c -> {}));

Reflect<T> reflect = new Reflect<>(t);

for (Field field : reflect.fieldMap.values()) {

String name = field.getName();

if (!columnsMap.isEmpty() && !columnsMap.getOrDefault(name, false)) {

continue;

}

String type = field.getType().getSimpleName().toLowerCase();

switch (type) {

case "int":

case "integer":

reflect.setValue(name, resultSet.getInt(name));

break;

case "byte":

reflect.setValue(name, resultSet.getByte(name));

break;

case "short":

reflect.setValue(name, resultSet.getShort(name));

break;

case "long":

reflect.setValue(name, resultSet.getLong(name));

break;

case "float":

reflect.setValue(name, resultSet.getFloat(name));

break;

case "double":

reflect.setValue(name, resultSet.getDouble(name));

break;

case "char":

case "character":

case "string":

reflect.setValue(name, resultSet.getString(name));

break;

case "boolean" :

reflect.setValue(name, resultSet.getBoolean(name));

break;

}

return reflect.get();

} catch (Exception e) {

throw new RuntimeException(e);

}

static boolean isIgnore(Field field) {

if (field.isAnnotationPresent(Column.class)) {

Column column = field.getAnnotation(Column.class);

return column.ignore();

}

return false;

}

static boolean isIndex(Field field) {

if (field.isAnnotationPresent(Column.class)) {

Column column = field.getAnnotation(Column.class);

return column.index();

}

return false;

}

orm-java/src/main/java/com/github/artbits/orm/Reflect.java at main · artbits/orm-java · GitHub

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