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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 = new Long(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, null, 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, null, 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, null, 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, null, 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, null, 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, null, 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, null, x[0]);
stat.appendSQL(" LIKE ");
query.appendSQL(stat, x[0], x[1]);
stat.appendSQL(")");
}
});
}
}
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