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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.phoenix.parse;

import java.sql.SQLException;
import java.util.Collections;
import java.util.List;

import org.apache.phoenix.compile.ColumnResolver;



/**
 * 
 * Node representing LIKE and NOT LIKE in SQL
 *
 * 
 * @since 0.1
 */
public class LikeParseNode extends BinaryParseNode {

    public enum LikeType {CASE_SENSITIVE, CASE_INSENSITIVE}

    private final boolean negate;
    private final LikeType likeType;

    LikeParseNode(ParseNode lhs, ParseNode rhs, boolean negate, LikeType likeType) {
        super(lhs, rhs);
        this.negate = negate;
        this.likeType = likeType;
    }

    public boolean isNegate() {
        return negate;
    }

    public LikeType getLikeType() {
      return likeType;
    }

    @Override
    public  T accept(ParseNodeVisitor visitor) throws SQLException {
        List l = Collections.emptyList();
        if (visitor.visitEnter(this)) {
            l = acceptChildren(visitor);
        }
        return visitor.visitLeave(this, l);
    }

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = super.hashCode();
		result = prime * result
				+ ((likeType == null) ? 0 : likeType.hashCode());
		result = prime * result + (negate ? 1231 : 1237);
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (!super.equals(obj))
			return false;
		if (getClass() != obj.getClass())
			return false;
		LikeParseNode other = (LikeParseNode) obj;
		if (likeType != other.likeType)
			return false;
		if (negate != other.negate)
			return false;
		return true;
	}

    
    @Override
    public void toSQL(ColumnResolver resolver, StringBuilder buf) {
        List children = getChildren();
        children.get(0).toSQL(resolver, buf);
        if (negate) buf.append(" NOT");
        buf.append(" " + (likeType == LikeType.CASE_SENSITIVE ? "LIKE" : "ILIKE") + " ");
        children.get(1).toSQL(resolver, buf);
    }
}