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Generate word(docx) with template
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/*
 * Copyright 2014-2019 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 com.deepoove.poi.render;

import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.deepoove.poi.NiceXWPFDocument;
import com.deepoove.poi.XWPFTemplate;
import com.deepoove.poi.config.Configure;
import com.deepoove.poi.exception.RenderException;
import com.deepoove.poi.policy.DocxRenderPolicy;
import com.deepoove.poi.policy.RenderPolicy;
import com.deepoove.poi.template.ElementTemplate;
import com.deepoove.poi.util.ObjectUtils;

/**
 * 渲染器，支持表达式计算接口RenderDataCompute的扩展
 * 
 * @author Sayi
 * @version
 * @since 1.5.0
 */
public class Render {

    private final Logger LOGGER = LoggerFactory.getLogger(Render.class);

    private RenderDataCompute renderDataCompute;

    /**
     * 默认计算器为ELObjectRenderDataCompute
     * 
     * @param root
     */
    public Render(Object root) {
        ObjectUtils.requireNonNull(root, "Data root is null, should be setted first.");
        renderDataCompute = new ELObjectRenderDataCompute(root, false);
    }

    public Render(RenderDataCompute dataCompute) {
        this.renderDataCompute = dataCompute;
    }

    public void render(XWPFTemplate template) {
        ObjectUtils.requireNonNull(template, "Template is null, should be setted first.");
        LOGGER.info("Render the template file start...");

        // 模板
        List elementTemplates = template.getElementTemplates();
        if (null == elementTemplates || elementTemplates.isEmpty()) { return; }
        // 策略
        RenderPolicy policy = null;

        try {
            int docxCount = 0;
            for (ElementTemplate runTemplate : elementTemplates) {
                policy = findPolicy(template.getConfig(), runTemplate);

                if (policy instanceof DocxRenderPolicy) {
                    docxCount++;
                    continue;
                }
                doRender(runTemplate, policy, template);
            }

            if (docxCount >= 1) template.reload(template.getXWPFDocument().generate());

            NiceXWPFDocument current = null;
            for (int i = 0; i < docxCount; i++) {
                current = template.getXWPFDocument();
                elementTemplates = template.getElementTemplates();
                if (null == elementTemplates || elementTemplates.isEmpty()) {
                    break;
                }

                for (ElementTemplate runTemplate : elementTemplates) {
                    policy = findPolicy(template.getConfig(), runTemplate);
                    if (!(policy instanceof DocxRenderPolicy)) {
                        continue;
                    }
                    doRender(runTemplate, policy, template);

                    // 没有最终合并，继续下一个合并
                    if (current == template.getXWPFDocument()) {
                        i++;
                        continue;
                    } else {
                        break;
                    }
                }
            }
        } catch (Exception e) {
            LOGGER.info("Render the template file failed.");
            throw new RenderException("Render docx failed.", e);
        }
        LOGGER.info("Render the template file successed.");
    }

    private RenderPolicy findPolicy(Configure config, ElementTemplate runTemplate) {
        RenderPolicy policy;
        policy = config.getPolicy(runTemplate.getTagName(), runTemplate.getSign());
        if (null == policy) { throw new RenderException(
                "Cannot find render policy: [" + runTemplate.getTagName() + "]"); }
        return policy;
    }

    private void doRender(ElementTemplate ele, RenderPolicy policy, XWPFTemplate template) {
        LOGGER.debug("Start render TemplateName:{}, Sign:{}, policy:{}", ele.getTagName(),
                ele.getSign(), policy.getClass().getSimpleName());
        policy.render(ele, renderDataCompute.compute(ele.getTagName()), template);
    }

}