/*
* 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 2011-1-21)
*/
package com.alibaba.cobar.parser.ast.expression.primary;
import java.util.Map;
import com.alibaba.cobar.parser.visitor.SQLASTVisitor;
/**
* <code>'?'</code>
*
* @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a>
*/
public class ParamMarker extends PrimaryExpression {
private final int paramIndex;
/**
* @param paramIndex start from 1
*/
public ParamMarker(int paramIndex) {
this.paramIndex = paramIndex;
}
/**
* @return start from 1
*/
public int getParamIndex() {
return paramIndex;
}
@Override
public int hashCode() {
return paramIndex;
}
@Override
public boolean equals(Object obj) {
if (obj == this)
return true;
if (obj instanceof ParamMarker) {
ParamMarker that = (ParamMarker) obj;
return this.paramIndex == that.paramIndex;
}
return false;
}
@Override
public Object evaluationInternal(Map<? extends Object, ? extends Object> parameters) {
return parameters.get(paramIndex);
}
@Override
public void accept(SQLASTVisitor visitor) {
visitor.visit(this);
}
}