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tasks/astrid/common-src/com/todoroo/andlib/sql/Query.java

173 lines
5.1 KiB
Java

package com.todoroo.andlib.sql;
import static com.todoroo.andlib.sql.Constants.ALL;
import static com.todoroo.andlib.sql.Constants.COMMA;
import static com.todoroo.andlib.sql.Constants.FROM;
import static com.todoroo.andlib.sql.Constants.GROUP_BY;
import static com.todoroo.andlib.sql.Constants.LEFT_PARENTHESIS;
import static com.todoroo.andlib.sql.Constants.ORDER_BY;
import static com.todoroo.andlib.sql.Constants.RIGHT_PARENTHESIS;
import static com.todoroo.andlib.sql.Constants.SELECT;
import static com.todoroo.andlib.sql.Constants.SPACE;
import static com.todoroo.andlib.sql.Constants.WHERE;
import static com.todoroo.andlib.sql.SqlTable.table;
import static java.util.Arrays.asList;
import java.util.ArrayList;
import com.todoroo.andlib.data.Property;
public final class Query {
private SqlTable table;
private final ArrayList<Criterion> criterions = new ArrayList<Criterion>();
private final ArrayList<Field> fields = new ArrayList<Field>();
private final ArrayList<Join> joins = new ArrayList<Join>();
private final ArrayList<Field> groupBies = new ArrayList<Field>();
private final ArrayList<Order> orders = new ArrayList<Order>();
private final ArrayList<Criterion> havings = new ArrayList<Criterion>();
private Query(Field... fields) {
this.fields.addAll(asList(fields));
}
public static Query select(Field... fields) {
return new Query(fields);
}
public Query from(SqlTable fromTable) {
this.table = fromTable;
return this;
}
public Query join(Join... join) {
joins.addAll(asList(join));
return this;
}
public Query where(Criterion criterion) {
criterions.add(criterion);
return this;
}
public Query groupBy(Field... groupBy) {
groupBies.addAll(asList(groupBy));
return this;
}
public Query orderBy(Order... order) {
orders.addAll(asList(order));
return this;
}
public Query appendSelectFields(Property<?>... selectFields) {
this.fields.addAll(asList(selectFields));
return this;
}
@Override
public boolean equals(Object o) {
return this == o || !(o == null || getClass() != o.getClass()) && this.toString().equals(o.toString());
}
@Override
public int hashCode() {
return toString().hashCode();
}
@Override
public String toString() {
StringBuilder sql = new StringBuilder();
visitSelectClause(sql);
visitFromClause(sql);
visitJoinClause(sql);
visitWhereClause(sql);
visitGroupByClause(sql);
visitOrderByClause(sql);
return sql.toString();
}
private void visitOrderByClause(StringBuilder sql) {
if (orders.isEmpty()) {
return;
}
sql.append(ORDER_BY);
for (Order order : orders) {
sql.append(SPACE).append(order).append(COMMA);
}
sql.deleteCharAt(sql.length() - 1).append(SPACE);
}
@SuppressWarnings("nls")
private void visitGroupByClause(StringBuilder sql) {
if (groupBies.isEmpty()) {
return;
}
sql.append(GROUP_BY);
for (Field groupBy : groupBies) {
sql.append(SPACE).append(groupBy).append(COMMA);
}
sql.deleteCharAt(sql.length() - 1).append(SPACE);
if (havings.isEmpty()) {
return;
}
sql.append("HAVING");
for (Criterion havingCriterion : havings) {
sql.append(SPACE).append(havingCriterion).append(COMMA);
}
sql.deleteCharAt(sql.length() - 1).append(SPACE);
}
private void visitWhereClause(StringBuilder sql) {
if (criterions.isEmpty()) {
return;
}
sql.append(WHERE);
for (Criterion criterion : criterions) {
sql.append(SPACE).append(criterion).append(SPACE);
}
}
private void visitJoinClause(StringBuilder sql) {
for (Join join : joins) {
sql.append(join).append(SPACE);
}
}
private void visitFromClause(StringBuilder sql) {
if (table == null) {
return;
}
sql.append(FROM).append(SPACE).append(table).append(SPACE);
}
private void visitSelectClause(StringBuilder sql) {
sql.append(SELECT).append(SPACE);
if (fields.isEmpty()) {
sql.append(ALL).append(SPACE);
return;
}
for (Field field : fields) {
sql.append(field.toStringInSelect()).append(COMMA);
}
sql.deleteCharAt(sql.length() - 1).append(SPACE);
}
public SqlTable as(String alias) {
return table(LEFT_PARENTHESIS + this.toString() + RIGHT_PARENTHESIS).as(alias);
}
public Query having(Criterion criterion) {
this.havings.add(criterion);
return this;
}
/**
* Gets a list of fields returned by this query
* @return
*/
public Property<?>[] getFields() {
return fields.toArray(new Property<?>[fields.size()]);
}
}