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package org.traccar.storage;
import org.traccar.storage.query.Columns;
import org.traccar.storage.query.Condition;
import org.traccar.storage.query.Limit;
import org.traccar.storage.query.Order;
import org.traccar.storage.query.Request;
import javax.sql.DataSource;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;
public class DatabaseStorage extends Storage {
private final DataSource dataSource;
public DatabaseStorage(DataSource dataSource) {
this.dataSource = dataSource;
}
@Override
public <T> List<T> getObjects(Class<T> clazz, Request request) throws StorageException {
StringBuilder query = new StringBuilder("SELECT ");
query.append(formatColumns(request.getColumns(), clazz, "get", c -> c));
query.append(" FROM ").append(getTableName(clazz));
query.append(formatCondition(request.getCondition()));
query.append(formatOrder(request.getOrder()));
try {
QueryBuilder builder = QueryBuilder.create(dataSource, query.toString());
for (Map.Entry<String, Object> variable : getConditionVariables(request.getCondition()).entrySet()) {
builder.setValue(variable.getKey(), variable.getValue());
}
return builder.executeQuery(clazz);
} catch (SQLException e) {
throw new StorageException(e);
}
}
@Override
public <T> long addObject(T entity, Request request) throws StorageException {
StringBuilder query = new StringBuilder("INSERT INTO ");
query.append(getTableName(entity.getClass()));
query.append("(");
query.append(formatColumns(request.getColumns(), entity.getClass(), "set", c -> c));
query.append(") VALUES (");
query.append(formatColumns(request.getColumns(), entity.getClass(), "set", c -> ':' + c));
query.append(")");
try {
QueryBuilder builder = QueryBuilder.create(dataSource, query.toString(), true);
builder.setObject(entity);
return builder.executeUpdate();
} catch (SQLException e) {
throw new StorageException(e);
}
}
@Override
public <T> void updateObject(T entity, Request request) throws StorageException {
StringBuilder query = new StringBuilder("UPDATE ");
query.append(getTableName(entity.getClass()));
query.append(" SET ");
query.append(formatColumns(request.getColumns(), entity.getClass(), "set", c -> c + " = :" + c));
query.append(formatCondition(request.getCondition()));
try {
QueryBuilder builder = QueryBuilder.create(dataSource, query.toString());
builder.setObject(entity);
for (Map.Entry<String, Object> variable : getConditionVariables(request.getCondition()).entrySet()) {
builder.setValue(variable.getKey(), variable.getValue());
}
builder.executeUpdate();
} catch (SQLException e) {
throw new StorageException(e);
}
}
@Override
public void removeObject(Class<?> clazz, Request request) throws StorageException {
StringBuilder query = new StringBuilder("DELETE FROM ");
query.append(getTableName(clazz));
query.append(formatCondition(request.getCondition()));
try {
QueryBuilder builder = QueryBuilder.create(dataSource, query.toString());
for (Map.Entry<String, Object> variable : getConditionVariables(request.getCondition()).entrySet()) {
builder.setValue(variable.getKey(), variable.getValue());
}
builder.executeUpdate();
} catch (SQLException e) {
throw new StorageException(e);
}
}
private String getTableName(Class<?> clazz) throws StorageException {
StorageName storageName = clazz.getAnnotation(StorageName.class);
if (storageName == null) {
throw new StorageException("StorageName annotation is missing");
}
return storageName.value();
}
private Map<String, Object> getConditionVariables(Condition genericCondition) {
Map<String, Object> results = new HashMap<>();
if (genericCondition instanceof Condition.Compare) {
Condition.Compare condition = (Condition.Compare) genericCondition;
if (condition.getValue() != null) {
results.put(condition.getVariable(), condition.getValue());
}
} else if (genericCondition instanceof Condition.Between) {
Condition.Between condition = (Condition.Between) genericCondition;
results.put(condition.getFromVariable(), condition.getFromValue());
results.put(condition.getToVariable(), condition.getToValue());
} else if (genericCondition instanceof Condition.Binary) {
Condition.Binary condition = (Condition.Binary) genericCondition;
results.putAll(getConditionVariables(condition.getFirst()));
results.putAll(getConditionVariables(condition.getSecond()));
}
return results;
}
private String formatColumns(
Columns columns, Class<?> clazz, String type, Function<String, String> mapper) {
return columns.getColumns(clazz, type).stream().map(mapper).collect(Collectors.joining(", "));
}
private String formatCondition(Condition genericCondition) {
return formatCondition(genericCondition, true);
}
private String formatCondition(Condition genericCondition, boolean appendWhere) {
StringBuilder result = new StringBuilder();
if (genericCondition != null) {
if (appendWhere) {
result.append(" WHERE ");
}
if (genericCondition instanceof Condition.Compare) {
Condition.Compare condition = (Condition.Compare) genericCondition;
result.append(condition.getColumn());
result.append(" ");
result.append(condition.getOperator());
result.append(" :");
result.append(condition.getVariable());
} else if (genericCondition instanceof Condition.Between) {
Condition.Between condition = (Condition.Between) genericCondition;
result.append(condition.getColumn());
result.append(" BETWEEN :");
result.append(condition.getFromVariable());
result.append(" AND :");
result.append(condition.getToVariable());
} else if (genericCondition instanceof Condition.Binary) {
Condition.Binary condition = (Condition.Binary) genericCondition;
result.append(formatCondition(condition.getFirst(), false));
result.append(" ");
result.append(condition.getOperator());
result.append(" ");
result.append(formatCondition(condition.getSecond(), false));
}
}
return result.toString();
}
private String formatOrder(Order order) {
StringBuilder result = new StringBuilder();
if (order != null) {
result.append(" ORDER BY ");
result.append(order.getColumn());
if (order.getDescending()) {
result.append(" DESC");
}
}
return result.toString();
}
private String formatLimit(Limit limit) {
StringBuilder result = new StringBuilder();
if (limit != null) {
result.append(" LIMIT ");
result.append(limit.getValue());
}
return result.toString();
}
}
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