/*
 * 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 jp.sf.amateras.mirage.parser;

import java.util.Map;

import ognl.ObjectPropertyAccessor;
import ognl.OgnlException;

/**
 * {@link SqlContext}のためのPropertyAccessorです。
 *
 * @author higa
 *
 */
public class SqlContextPropertyAccessor extends ObjectPropertyAccessor {

    private static final String HAS_PREFIX = "has_";

    @Override
    @SuppressWarnings("unchecked")
    public Object getProperty(Map cx, Object target, Object name)
            throws OgnlException {

        SqlContext ctx = (SqlContext) target;
        String argName = name.toString();
        if (argName.startsWith(HAS_PREFIX)) {
            return Boolean.valueOf(ctx.hasArg(argName.substring(HAS_PREFIX
                    .length())));
        }
        Object arg = ctx.getArg(argName);
        if (arg instanceof SqlArgWrapper) {
            SqlArgWrapper wrapper = (SqlArgWrapper) arg;
            return wrapper.getValue();
        }
        return arg;
    }

}