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- /*
- * Copyright 2004-2011 H2 Group.
- * Copyright 2011 James Moger.
- *
- * 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
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * 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.iciql;
-
- import com.iciql.util.Utils;
-
- /**
- * This class provides static methods that represents common SQL functions.
- */
- public class Function implements Token {
-
- // must be a new instance
- private static final Long COUNT_STAR = Long.valueOf(0);
-
- protected Object[] x;
- private String name;
-
- protected Function(String name, Object... x) {
- this.name = name;
- this.x = x;
- }
-
- public <T> void appendSQL(SQLStatement stat, Query<T> query) {
- stat.appendSQL(name).appendSQL("(");
- int i = 0;
- for (Object o : x) {
- if (i++ > 0) {
- stat.appendSQL(",");
- }
- query.appendSQL(stat, o);
- }
- stat.appendSQL(")");
- }
-
- public static Long count() {
- return COUNT_STAR;
- }
-
- public static Integer length(Object x) {
- return Db.registerToken(Utils.newObject(Integer.class), new Function("LENGTH", x));
- }
-
- @SuppressWarnings("unchecked")
- public static <T extends Number> T sum(T x) {
- return (T) Db.registerToken(Utils.newObject(x.getClass()), new Function("SUM", x));
- }
-
- public static Long count(Object x) {
- return Db.registerToken(Utils.newObject(Long.class), new Function("COUNT", x));
- }
-
- public static Boolean isNull(Object x) {
- return Db.registerToken(Utils.newObject(Boolean.class), new Function("", x) {
- public <T> void appendSQL(SQLStatement stat, Query<T> query) {
- query.appendSQL(stat, x[0]);
- stat.appendSQL(" IS NULL");
- }
- });
- }
-
- public static Boolean isNotNull(Object x) {
- return Db.registerToken(Utils.newObject(Boolean.class), new Function("", x) {
- public <T> void appendSQL(SQLStatement stat, Query<T> query) {
- query.appendSQL(stat, x[0]);
- stat.appendSQL(" IS NOT NULL");
- }
- });
- }
-
- public static Boolean not(Boolean x) {
- return Db.registerToken(Utils.newObject(Boolean.class), new Function("", x) {
- public <T> void appendSQL(SQLStatement stat, Query<T> query) {
- stat.appendSQL("NOT ");
- query.appendSQL(stat, x[0]);
- }
- });
- }
-
- public static Boolean or(Boolean... x) {
- return Db.registerToken(Utils.newObject(Boolean.class), new Function("", (Object[]) x) {
- public <T> void appendSQL(SQLStatement stat, Query<T> query) {
- int i = 0;
- for (Object o : x) {
- if (i++ > 0) {
- stat.appendSQL(" OR ");
- }
- query.appendSQL(stat, o);
- }
- }
- });
- }
-
- public static Boolean and(Boolean... x) {
- return Db.registerToken(Utils.newObject(Boolean.class), new Function("", (Object[]) x) {
- public <T> void appendSQL(SQLStatement stat, Query<T> query) {
- int i = 0;
- for (Object o : x) {
- if (i++ > 0) {
- stat.appendSQL(" AND ");
- }
- query.appendSQL(stat, o);
- }
- }
- });
- }
-
- @SuppressWarnings("unchecked")
- public static <X> X min(X x) {
- Class<X> clazz = (Class<X>) x.getClass();
- X o = Utils.newObject(clazz);
- return Db.registerToken(o, new Function("MIN", x));
- }
-
- @SuppressWarnings("unchecked")
- public static <X> X max(X x) {
- Class<X> clazz = (Class<X>) x.getClass();
- X o = Utils.newObject(clazz);
- return Db.registerToken(o, new Function("MAX", x));
- }
-
- public static Boolean like(String x, String pattern) {
- Boolean o = Utils.newObject(Boolean.class);
- return Db.registerToken(o, new Function("LIKE", x, pattern) {
- public <T> void appendSQL(SQLStatement stat, Query<T> query) {
- stat.appendSQL("(");
- query.appendSQL(stat, x[0]);
- stat.appendSQL(" LIKE ");
- query.appendSQL(stat, x[1]);
- stat.appendSQL(")");
- }
- });
- }
-
- }
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