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/*
 * Copyright 1999-2101 Alibaba Group Holding Ltd.
 *
 * 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.sharksharding.sql.ast.statement;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import com.sharksharding.exception.SqlParserException;
import com.sharksharding.sql.ast.SQLExpr;
import com.sharksharding.sql.ast.SQLObjectImpl;
import com.sharksharding.sql.visitor.SQLASTVisitor;

public class SQLSelectQueryBlock extends SQLObjectImpl implements SQLSelectQuery {

	protected int distionOption;
	protected final List selectList = new ArrayList();

	protected SQLTableSource from;
	protected SQLExprTableSource into;
	protected SQLExpr where;
	protected SQLSelectGroupByClause groupBy;
	protected boolean parenthesized = false;

	public SQLSelectQueryBlock() {

	}

	public SQLExprTableSource getInto() {
		return into;
	}

	public void setInto(SQLExpr into) {
		this.setInto(new SQLExprTableSource(into));
	}

	public void setInto(SQLExprTableSource into) {
		if (into != null) {
			into.setParent(this);
		}
		this.into = into;
	}

	public SQLSelectGroupByClause getGroupBy() {
		return this.groupBy;
	}

	public void setGroupBy(SQLSelectGroupByClause groupBy) {
		this.groupBy = groupBy;
	}

	public SQLExpr getWhere() {
		return this.where;
	}

	/**
	 * 通过正则表达式拆分where后的数据
	 * 
	 * @author gaoxianglong
	 * 
	 * @throws SqlParserException
	 * 
	 * @return List columns
	 */
	public List getWhere_() {
		List columns = null;
		if (null == where) {
			throw new SqlParserException("no condition");
		} else {
			columns = Arrays.asList(where.toString().split("\\s"));
		}
		return columns;
	}

	public void setWhere(SQLExpr where) {
		if (where != null) {
			where.setParent(this);
		}
		this.where = where;
	}

	public int getDistionOption() {
		return this.distionOption;
	}

	public void setDistionOption(int distionOption) {
		this.distionOption = distionOption;
	}

	public List getSelectList() {
		return this.selectList;
	}

	public void addSelectItem(SQLSelectItem item) {
		this.selectList.add(item);
		item.setParent(this);
	}

	public SQLTableSource getFrom() {
		return this.from;
	}

	public void setFrom(SQLTableSource from) {
		this.from = from;
	}

	public boolean isParenthesized() {
		return parenthesized;
	}

	public void setParenthesized(boolean parenthesized) {
		this.parenthesized = parenthesized;
	}

	@Override
	protected void accept0(SQLASTVisitor visitor) {
		if (visitor.visit(this)) {
			acceptChild(visitor, this.selectList);
			acceptChild(visitor, this.from);
			acceptChild(visitor, this.where);
			acceptChild(visitor, this.groupBy);
		}
		visitor.endVisit(this);
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + (Boolean.valueOf(parenthesized).hashCode());
		result = prime * result + distionOption;
		result = prime * result + ((from == null) ? 0 : from.hashCode());
		result = prime * result + ((groupBy == null) ? 0 : groupBy.hashCode());
		result = prime * result + ((into == null) ? 0 : into.hashCode());
		result = prime * result + ((selectList == null) ? 0 : selectList.hashCode());
		result = prime * result + ((where == null) ? 0 : where.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		SQLSelectQueryBlock other = (SQLSelectQueryBlock) obj;
		if (parenthesized ^ other.parenthesized)
			return false;
		if (distionOption != other.distionOption)
			return false;
		if (from == null) {
			if (other.from != null)
				return false;
		} else if (!from.equals(other.from))
			return false;
		if (groupBy == null) {
			if (other.groupBy != null)
				return false;
		} else if (!groupBy.equals(other.groupBy))
			return false;
		if (into == null) {
			if (other.into != null)
				return false;
		} else if (!into.equals(other.into))
			return false;
		if (selectList == null) {
			if (other.selectList != null)
				return false;
		} else if (!selectList.equals(other.selectList))
			return false;
		if (where == null) {
			if (other.where != null)
				return false;
		} else if (!where.equals(other.where))
			return false;
		return true;
	}

}