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the hasor DataQL project.
There is a newer version: 4.2.5
/*
 * 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.runtime.inset;
import net.hasor.dataql.InvokerProcessException;
import net.hasor.dataql.ProcessException;
import net.hasor.dataql.result.ListModel;
import net.hasor.dataql.runtime.InsetProcess;
import net.hasor.dataql.runtime.InstSequence;
import net.hasor.dataql.runtime.ProcessContet;
import net.hasor.dataql.runtime.mem.MemStack;
import net.hasor.dataql.runtime.mem.StackStruts;
import net.hasor.utils.StringUtils;

import java.util.Collection;
/**
 * NO，创建一个集合对象
 * @author 赵永春([email protected])
 * @version : 2017-07-19
 */
class NA implements InsetProcess {
    @Override
    public int getOpcode() {
        return NA;
    }
    @Override
    public void doWork(InstSequence sequence, MemStack memStack, StackStruts local, ProcessContet context) throws ProcessException {
        String typeString = sequence.currentInst().getString(0);
        Class listType = null;
        if (StringUtils.isNotBlank(typeString)) {
            try {
                listType = context.loadType(typeString);
            } catch (Exception e) {
                throw new InvokerProcessException(getOpcode(), "load type failed -> " + typeString, e);
            }
        }
        //
        ListModel data = null;
        try {
            if (listType != null) {
                if (!Collection.class.isAssignableFrom(listType)) {
                    throw new InvokerProcessException(getOpcode(), "NA -> type " + listType + " is not Collection");
                }
                data = new ListModel(listType.newInstance());
            } else {
                data = new ListModel();
            }
            memStack.push(data);
        } catch (Exception e) {
            throw new InvokerProcessException(getOpcode(), "NA -> " + e.getMessage(), e);
        }
    }
}