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win.doyto.query.core.QueryBuilder Maven / Gradle / Ivy
// Generated by delombok at Sat Aug 10 11:56:00 CST 2019
package win.doyto.query.core;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.reflect.FieldUtils;
import win.doyto.query.config.GlobalConfiguration;
import win.doyto.query.entity.Persistable;
import java.lang.reflect.Field;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.regex.Pattern;
import javax.persistence.Id;
import javax.persistence.Table;
import static win.doyto.query.core.CommonUtil.*;
import static win.doyto.query.core.Constant.*;
/**
* QueryBuilder
*
* @author f0rb
*/
public class QueryBuilder {
@java.lang.SuppressWarnings("all")
@lombok.Generated
private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(QueryBuilder.class);
private static final Pattern PTN_REPLACE = Pattern.compile("\\w+");
private static final Pattern PTN_SORT = Pattern.compile(",(asc|desc)", Pattern.CASE_INSENSITIVE);
private static final Map classFieldsMap = new ConcurrentHashMap<>();
protected static final String EQUALS_REPLACE_HOLDER = " = " + Constant.REPLACE_HOLDER;
protected final String tableName;
protected final String idColumn;
protected final String whereId;
public QueryBuilder(String tableName, String idColumn) {
this.tableName = tableName;
this.idColumn = idColumn;
this.whereId = " WHERE " + idColumn + EQUALS_REPLACE_HOLDER;
}
public QueryBuilder(Class entityClass) {
tableName = entityClass.getAnnotation(Table.class).name();
Field idField = FieldUtils.getFieldsWithAnnotation(entityClass, Id.class)[0];
idColumn = resolveColumn(idField);
whereId = " WHERE " + idColumn + EQUALS_REPLACE_HOLDER;
}
private String build(PageQuery pageQuery, List argList, String... columns) {
return build(pageQuery, argList, Constant.SELECT, columns, tableName);
}
@SuppressWarnings("squid:S4973")
static String build(PageQuery pageQuery, List argList, String operation, String[] columns, String from) {
String sql;
sql = buildStart(operation, columns, from);
sql = buildWhere(sql, pageQuery, argList);
// intentionally use ==
if (!(columns.length == 1 && COUNT == columns[0])) {
// not SELECT COUNT(*)
sql = buildOrderBy(sql, pageQuery, operation);
sql = buildPaging(sql, pageQuery);
}
return sql;
}
static String buildStart(String operation, String[] columns, String from) {
return operation + StringUtils.join(columns, SEPARATOR) + FROM + from;
}
@SuppressWarnings("squid:S4973")
static String buildOrderBy(String sql, PageQuery pageQuery, String operation) {
// intentionally use ==
if (SELECT == operation && pageQuery.getSort() != null) {
sql += " ORDER BY " + PTN_SORT.matcher(pageQuery.getSort()).replaceAll(" $1").replaceAll(";", SEPARATOR);
}
return sql;
}
static String buildPaging(String sql, PageQuery pageQuery) {
if (pageQuery.needPaging()) {
sql = GlobalConfiguration.instance().getDialect().buildPageSql(sql, pageQuery.getPageSize(), pageQuery.getOffset());
}
return sql;
}
public static String buildWhere(String sql, Object query, List argList) {
initFields(query);
Field[] fields = classFieldsMap.get(query.getClass());
List whereList = new ArrayList<>(fields.length);
for (Field field : fields) {
String fieldName = field.getName();
Object value = readFieldGetter(field, query);
if (isValidValue(value, field)) {
if (sql.contains("${" + fieldName + "}") && value instanceof String && PTN_REPLACE.matcher((String) value).matches()) {
sql = sql.replaceAll("\\$\\{" + fieldName + "}", String.valueOf(value));
} else {
String and = FieldProcessor.execute(argList, field, value);
if (and != null) {
whereList.add(and);
}
}
}
}
if (!whereList.isEmpty()) {
sql += WHERE + StringUtils.join(whereList, " AND ");
}
return sql;
}
private static void initFields(Object query) {
Class clazz = query.getClass();
if (!classFieldsMap.containsKey(clazz)) {
classFieldsMap.put(clazz, Arrays.stream(clazz.getDeclaredFields()).filter(field -> !ignoreField(field)).toArray(Field[]::new));
for (Field field : classFieldsMap.get(clazz)) {
FieldProcessor.init(field);
}
}
}
public String buildSelectAndArgs(PageQuery query, List argList) {
return buildSelectColumnsAndArgs(query, argList, "*");
}
public String buildCountAndArgs(PageQuery query, List argList) {
return build(query, argList, COUNT);
}
public SqlAndArgs buildCountAndArgs(PageQuery query) {
ArrayList argList = new ArrayList<>();
return new SqlAndArgs(buildCountAndArgs(query, argList), argList);
}
public String buildSelectColumnsAndArgs(PageQuery query, List argList, String... columns) {
return build(query, argList, columns);
}
public SqlAndArgs buildSelectColumnsAndArgs(PageQuery query, String... columns) {
ArrayList argList = new ArrayList<>();
return new SqlAndArgs(buildSelectColumnsAndArgs(query, argList, columns), argList);
}
protected SqlAndArgs buildSelectById(Object entity, String... columns) {
if (columns.length == 0) {
columns = new String[] {"*"};
}
String selectFrom = SELECT + StringUtils.join(columns, SEPARATOR) + FROM;
if (entity instanceof Persistable) {
return new SqlAndArgs(selectFrom + replaceHolderInString(entity, tableName) + whereId, Collections.singletonList(((Persistable) entity).getId()));
}
return new SqlAndArgs(selectFrom + tableName + whereId, Collections.singletonList(entity));
}
protected SqlAndArgs buildSelectIdAndArgs(PageQuery query) {
return buildSelectColumnsAndArgs(query, idColumn);
}
}
