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Provides a Java Domain Specific Language for building type-safe and refactoring proof JPA queries.
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/*
 * Copyright (C) 2008-2009 the original author or authors
 * 
 * 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.google.code.liquidform;

import java.util.Date;

import com.google.code.liquidform.conditions.ConditionalExpression;
import com.google.code.liquidform.internal.ObjectUtils;

/**
 * Represents the optional WHERE condition part of the query.
 * 
 * @param 
 *            the type that was selected by the {@link SelectClause SELECT
 *            construct}
 */
public class WhereClause extends AbstractClause implements SubQuery {

	private final ConditionalExpression conditionalExpression;

	/* default */WhereClause(FromClause previousClause,
			ConditionalExpression conditionalExpression) {
		super(previousClause);
		this.conditionalExpression = conditionalExpression;
	}

	@Override
	StringBuilder addTo(StringBuilder buffer) {
		buffer.append(" where ").append(
				conditionalExpression.getPreferredStringRepresentation());
		return buffer;
	}

	// ============================ G R O U P B Y ==============================
	public GroupByClause groupBy(Object groupByItem, Object... more) {
		return new GroupByClause(this, ObjectUtils.merge(Object.class,
				groupByItem, more));
	}

	// ============================ O R D E R B Y ==========================
	public OrderByClause orderBy(Number o) {
		return this.orderBy(o, SortDirection.ASC);
	}

	public OrderByClause orderBy(Number o, SortDirection dir) {
		return new OrderByClause(this, o, dir);
	}

	public OrderByClause orderBy(Date o) {
		return this.orderBy(o, SortDirection.ASC);
	}

	public OrderByClause orderBy(Date o, SortDirection dir) {
		return new OrderByClause(this, o, dir);
	}

	public OrderByClause orderBy(String o) {
		return this.orderBy(o, SortDirection.ASC);
	}

	public OrderByClause orderBy(String o, SortDirection dir) {
		return new OrderByClause(this, o, dir);
	}

	public OrderByClause orderBy(Character o) {
		return this.orderBy(o, SortDirection.ASC);
	}

	public OrderByClause orderBy(Character o, SortDirection dir) {
		return new OrderByClause(this, o, dir);
	}

	// TODO : legal or not?
	// public OrderByClause orderBy(Enum o) {
	// return this.orderBy(o, SortDirection.ASC);
	// }
	//
	// public OrderByClause orderBy(Enum o, SortDirection dir) {
	// return new OrderByClause(this, o, dir);
	// }
}