IndexOption.java

/*
 * 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 2012-8-13)
 */
package fm.liu.timo.parser.ast.fragment.ddl.index;

import fm.liu.timo.parser.ast.ASTNode;
import fm.liu.timo.parser.ast.expression.Expression;
import fm.liu.timo.parser.ast.expression.primary.Identifier;
import fm.liu.timo.parser.ast.expression.primary.literal.LiteralString;
import fm.liu.timo.parser.visitor.Visitor;

/**
 * @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a>
 */
public class IndexOption implements ASTNode {
    public static enum IndexType {
        BTREE, HASH
    }

    private final Expression    keyBlockSize;
    private final IndexType     indexType;
    private final Identifier    parserName;
    private final LiteralString comment;

    public IndexOption(Expression keyBlockSize) {
        this.keyBlockSize = keyBlockSize;
        this.indexType = null;
        this.parserName = null;
        this.comment = null;
    }

    public IndexOption(IndexType indexType) {
        this.keyBlockSize = null;
        this.indexType = indexType;
        this.parserName = null;
        this.comment = null;
    }

    public IndexOption(Identifier parserName) {
        this.keyBlockSize = null;
        this.indexType = null;
        this.parserName = parserName;
        this.comment = null;
    }

    public IndexOption(LiteralString comment) {
        this.keyBlockSize = null;
        this.indexType = null;
        this.parserName = null;
        this.comment = comment;
    }

    public Expression getKeyBlockSize() {
        return keyBlockSize;
    }

    public IndexType getIndexType() {
        return indexType;
    }

    public Identifier getParserName() {
        return parserName;
    }

    public LiteralString getComment() {
        return comment;
    }

    @Override
    public void accept(Visitor visitor) {
        visitor.visit(this);
    }

}