/*
* Copyright (C) 2003-2011 eXo Platform SAS.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.exoplatform.social.core.storage.query;
import com.google.caja.parser.js.QuotedExpression;
/**
* @author <a href="mailto:alain.defrance@exoplatform.com">Alain Defrance</a>
* @version $Revision$
*/
public class WhereExpression {
private static final String QUOTED = "'%s'";
private static final String DIRECT = "%s";
private final StringBuilder builder;
private int openGroup = 0;
public WhereExpression() {
builder = new StringBuilder();
}
public <T> WhereExpression equals(PropertyLiteralExpression<T> property, T value) {
checkParam(property, value);
builder.append(String.format("%s = %s ", property.getName(), espace(property, value)));
return this;
}
public <T> WhereExpression lesser(PropertyLiteralExpression<T> property, T value) {
checkParam(property, value);
builder.append(String.format("%s < %s ", property.getName(), value));
return this;
}
public <T> WhereExpression lessEq(PropertyLiteralExpression<T> property, T value) {
checkParam(property, value);
builder.append(String.format("%s <= %s ", property.getName(), value));
return this;
}
public <T> WhereExpression greater(PropertyLiteralExpression<T> property, T value) {
checkParam(property, value);
builder.append(String.format("%s > %s ", property.getName(), espace(property, value)));
return this;
}
public <T> WhereExpression greaterEq(PropertyLiteralExpression<T> property, T value) {
checkParam(property, value);
builder.append(String.format("%s >= '%s' ", property.getName(), value));
return this;
}
public <T> WhereExpression like(PropertyLiteralExpression<T> property, T value) {
checkParam(property, value);
builder.append(String.format("%s LIKE '%s' ", property.getName(), value));
return this;
}
public <T> WhereExpression like(CallExpression<T> call, T value) {
checkParam(call.getProperty(), value);
builder.append(String.format("%s(%s) LIKE '%s' ", call.getFunction(), call.getProperty().getName(), value));
return this;
}
public <T> WhereExpression contains(PropertyLiteralExpression<T> property, T value) {
checkParam(property, value);
builder.append(String.format("CONTAINS (%s, '%s') ", property.getName(), value));
return this;
}
public <T> WhereExpression orderBy(PropertyLiteralExpression<T> property, Order order) {
builder.append(String.format("ORDER BY %s %s", property.getName(), order.toString()));
return this;
}
public WhereExpression startGroup() {
builder.append("(");
++openGroup;
return this;
}
public WhereExpression endGroup() {
builder.append(") ");
--openGroup;
return this;
}
public WhereExpression endAllGroup() {
while (openGroup > 0) {
endGroup();
}
return this;
}
public WhereExpression not() {
builder.append("NOT ");
return this;
}
public WhereExpression or() {
builder.append("OR ");
return this;
}
public WhereExpression and() {
builder.append("AND ");
return this;
}
public String toString() {
return builder.toString();
}
public <T> CallExpression callFunction(QueryFunction function, PropertyLiteralExpression<T> property) {
return new CallExpression(function, property);
}
private <T> String espace(PropertyLiteralExpression<T> property, T value) {
String format = (property.getType().equals(Long.class) ? DIRECT : QUOTED);
return String.format(format, value);
}
private <T> void checkParam(PropertyLiteralExpression<T> property, T value) {
if (!property.getType().equals(value.getClass())) {
throw new IllegalArgumentException();
}
}
}