net.hasor.dataql.parser.ast.inst.HintInst Maven / Gradle / Ivy

/*
 * Copyright 2008-2009 the original author or authors.
 *
 * 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.
 */
package net.hasor.dataql.parser.ast.inst;
import net.hasor.dataql.Hints;
import net.hasor.dataql.parser.ast.AstVisitor;
import net.hasor.dataql.parser.ast.FormatWriter;
import net.hasor.dataql.parser.ast.Inst;
import net.hasor.dataql.parser.ast.InstVisitorContext;
import net.hasor.dataql.parser.ast.token.StringToken;
import net.hasor.dataql.parser.ast.value.PrimitiveVariable;
import net.hasor.dataql.parser.location.BlockLocation;
import net.hasor.utils.StringUtils;

import java.io.IOException;

/**
 * 查询选项
 * @author 赵永春 ([email protected])
 * @version : 2017-03-23
 */
public class HintInst extends BlockLocation implements Inst {
    private final StringToken       hint;
    private final PrimitiveVariable value;

    public HintInst(StringToken hint, PrimitiveVariable value) {
        this.hint = hint;
        this.value = value;
    }

    public StringToken getHint() {
        return hint;
    }

    public PrimitiveVariable getValue() {
        return value;
    }

    @Override
    public void accept(AstVisitor astVisitor) {
        astVisitor.visitInst(new InstVisitorContext(this) {
            @Override
            public void visitChildren(AstVisitor astVisitor) {
                value.accept(astVisitor);
            }
        });
    }

    @Override
    public void doFormat(int depth, Hints formatOption, FormatWriter writer) throws IOException {
        String fixedString = StringUtils.repeat(' ', depth * fixedLength);
        String opt = fixedString + "hint " + this.hint.getValue() + " = ";
        writer.write(opt);
        this.value.doFormat(depth + 1, formatOption, writer);
        writer.write(";\n");
    }
}