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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 || String concatenation in a SQL expression
 *
 * 
 * @since 0.1
 */
public class StringConcatParseNode extends CompoundParseNode {

    StringConcatParseNode(List children) {
        super(children);
    }

    @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 void toSQL(ColumnResolver resolver, StringBuilder buf) {
        buf.append('(');
        List children = getChildren();
        children.get(0).toSQL(resolver, buf);
        for (int i = 1 ; i < children.size(); i++) {
            buf.append(" || ");
            children.get(i).toSQL(resolver, buf);
        }
        buf.append(')');
    }
}