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Package for running Aspectran-based Java applications as background processes on Unix-based or Windows operating systems

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/*
 * Copyright (c) 2008-2018 The Aspectran Project
 *
 * 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.aspectran.daemon.command.builtin;

import com.aspectran.core.activity.Activity;
import com.aspectran.core.activity.InstantActivity;
import com.aspectran.core.activity.request.parameter.ParameterMap;
import com.aspectran.core.context.expr.ItemEvaluator;
import com.aspectran.core.context.expr.ItemExpressionParser;
import com.aspectran.core.context.rule.IllegalRuleException;
import com.aspectran.core.context.rule.ItemRuleMap;
import com.aspectran.daemon.command.AbstractCommand;
import com.aspectran.daemon.command.CommandRegistry;
import com.aspectran.daemon.command.polling.CommandParameters;

import java.util.Map;

public class TemplateCommand extends AbstractCommand {

    private static final String NAMESPACE = "builtin";

    private static final String COMMAND_NAME = "template";

    private CommandDescriptor descriptor = new CommandDescriptor();

    public TemplateCommand(CommandRegistry registry) {
        super(registry);
    }

    @Override
    public String execute(CommandParameters parameters) throws Exception {
        String templateName = parameters.getTemplateName();
        ItemRuleMap parameterItemRuleMap = parameters.getParameterItemRuleMap();
        ItemRuleMap attributeItemRuleMap = parameters.getAttributeItemRuleMap();

        if (templateName == null) {
            throw new IllegalRuleException("Parameter 'template' is not specified");
        }

        ParameterMap parameterMap = null;
        Map attrs = null;
        if (parameterItemRuleMap != null || attributeItemRuleMap != null) {
            Activity activity = new InstantActivity(getService().getActivityContext());
            ItemEvaluator evaluator = new ItemExpressionParser(activity);
            if (parameterItemRuleMap != null) {
                parameterMap = evaluator.evaluateAsParameterMap(parameterItemRuleMap);
            }
            if (attributeItemRuleMap != null) {
                attrs = evaluator.evaluate(attributeItemRuleMap);
            }
        }

        String output = getService().template(templateName, parameterMap, attrs);
        return output;
    }

    @Override
    public Descriptor getDescriptor() {
        return descriptor;
    }

    private class CommandDescriptor implements Descriptor {

        @Override
        public String getNamespace() {
            return NAMESPACE;
        }

        @Override
        public String getName() {
            return COMMAND_NAME;
        }

        @Override
        public String getDescription() {
            return "Executes a template";
        }

    }

}