/*
 * Copyright Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags and
 * the COPYRIGHT.txt file distributed with this work.
 *
 * 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 org.teiid.query.sql.symbol;

import java.util.List;

import org.teiid.core.util.EquivalenceUtil;
import org.teiid.core.util.HashCodeUtil;
import org.teiid.query.sql.LanguageObject;
import org.teiid.query.sql.LanguageVisitor;
import org.teiid.query.sql.lang.OrderBy;
import org.teiid.query.sql.visitor.SQLStringVisitor;

public class WindowSpecification implements LanguageObject {
	
	private List<Expression> partition;
	private OrderBy orderBy;
	private WindowFrame windowFrame;
	
	public WindowSpecification() {
		
	}
	
	public List<Expression> getPartition() {
		return partition;
	}
	
	public void setPartition(List<Expression> grouping) {
		this.partition = grouping;
	}
	
	public OrderBy getOrderBy() {
		return orderBy;
	}
	
	public void setOrderBy(OrderBy orderBy) {
		this.orderBy = orderBy;
	}
	
	public WindowFrame getWindowFrame() {
        return windowFrame;
    }
	
	public void setWindowFrame(WindowFrame frame) {
        this.windowFrame = frame;
    }

	@Override
	public void acceptVisitor(LanguageVisitor visitor) {
		visitor.visit(this);
	}
	
	@Override
	public int hashCode() {
		return HashCodeUtil.hashCode(0, partition, orderBy, windowFrame);
	}
	
	@Override
	public boolean equals(Object obj) {
		if (obj == this) {
			return true;
		}
		if (!(obj instanceof WindowSpecification)) {
			return false;
		}
		WindowSpecification other = (WindowSpecification)obj;
		return EquivalenceUtil.areEqual(this.partition, other.partition) &&
		EquivalenceUtil.areEqual(this.orderBy, other.orderBy) &&
		EquivalenceUtil.areEqual(this.windowFrame, other.windowFrame);
	}
	
	@Override
	public WindowSpecification clone() {
		WindowSpecification clone = new WindowSpecification();
		if (this.partition != null) {
			clone.setPartition(LanguageObject.Util.deepClone(this.partition, Expression.class));
		}
		if (this.orderBy != null) {
			clone.setOrderBy(this.orderBy.clone());
		}
		if (this.windowFrame != null) {
		    clone.setWindowFrame(this.windowFrame.clone());
		}
		return clone;
	}
	
	@Override
	public String toString() {
		return SQLStringVisitor.getSQLString(this);
	}
	
}
