/*
* Copyright 1999-2012 Alibaba Group.
*
* 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.
*/
/**
* (created at 2011-1-20)
*/
package com.alibaba.cobar.parser.ast.expression.type;
import java.util.Map;
import com.alibaba.cobar.parser.ast.expression.AbstractExpression;
import com.alibaba.cobar.parser.ast.expression.Expression;
import com.alibaba.cobar.parser.visitor.SQLASTVisitor;
/**
* <code>higherExpr 'COLLATE' collateName</code>
*
* @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a>
*/
public class CollateExpression extends AbstractExpression {
private final String collateName;
private final Expression string;
public CollateExpression(Expression string, String collateName) {
if (collateName == null)
throw new IllegalArgumentException("collateName is null");
this.string = string;
this.collateName = collateName;
}
public String getCollateName() {
return collateName;
}
public Expression getString() {
return string;
}
@Override
public int getPrecedence() {
return PRECEDENCE_COLLATE;
}
@Override
public Object evaluationInternal(Map<? extends Object, ? extends Object> parameters) {
return string.evaluation(parameters);
}
@Override
public void accept(SQLASTVisitor visitor) {
visitor.visit(this);
}
}