BindVariableNode.java

/*
 * Copyright 2004-2010 the Seasar Foundation and the Others.
 *
 * 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 com.github.mygreen.splate.node;

import org.springframework.core.style.ToStringCreator;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.Expression;

import com.github.mygreen.splate.type.SqlTemplateValueType;

import lombok.Getter;

/**
 * （コメントによる定義の）バインド変数のための{@link Node}です。
 *
 * @version 0.2
 * @author higa
 * @author T.TSUCHIE
 */
public class BindVariableNode extends AbstractNode {

    /**
     * 式
     */
    @Getter
    private final String expression;

    /**
     * パース済みの式
     */
    private final Expression parsedExpression;

    /**
     * {@link BindVariableNode} を作成します。
     *
     * @param position テンプレートの位置情報
     * @param expression 式
     * @param parsedExpression パース済みの式
     */
    public BindVariableNode(final int position, final String expression, final Expression parsedExpression) {
        super(position);
        this.expression = expression;
        this.parsedExpression = parsedExpression;
    }

    @Override
    public void accept(final NodeProcessContext ctx) {

        final EvaluationContext evaluationContext = ctx.getEvaluationContext();
        Object value = evaluateExpression(parsedExpression, evaluationContext, Object.class, getPosition(), ctx.getParsedSql());
        Class<?> clazz = parsedExpression.getValueType(evaluationContext);

        SqlTemplateValueType<?> valueType = ctx.getValueTypeRegistry().findValueType(clazz, expression);
        value = getBindVariableValue(value, valueType, getPosition(), ctx.getParsedSql(), expression);
        ctx.addSql("?", value);
    }

    @Override
    public String toString() {
        return new ToStringCreator(this)
                .append("position", getPosition())
                .append("expression", expression)
                .append("parsedExpression", parsedExpression)
                .append("children", children)
                .toString();
    }
}