com.github.edgarespina.mwa.wro4j.JavaScriptExporter Maven / Gradle / Ivy

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package com.github.edgarespina.mwa.wro4j;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.springframework.web.servlet.ModelAndView;

import ro.isdc.wro.manager.factory.BaseWroManagerFactory;
import ro.isdc.wro.model.group.Group;
import ro.isdc.wro.model.resource.Resource;
import ro.isdc.wro.model.resource.ResourceType;

/**
 * Publish a module attribute that define a script elements.
 *
 * @author edgar.espina
 * @since 0.1
 */
final class JavaScriptExporter extends WroContribution {

  /**
   * The list of script resources.
   */
  public static final String RESOURCES = "javascript-resources";

  /**
   * The default variable's name.
   */
  public static final String VARIABLE_NAME = "scripts";

  /**
   * Creates a new {@link JavaScriptExporter} and js scripts under the
   * variable's name.
   *
   * @param wroManagerFactory The {@link BaseWroManagerFactory}. Required.
   */
  public JavaScriptExporter(final BaseWroManagerFactory wroManagerFactory) {
    super(wroManagerFactory);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void doContribution(final Group group,
      final ModelAndView modelAndView) throws IOException {
    String view = modelAndView.getViewName();
    Map model = modelAndView.getModel();
    StringBuilder buffer = new StringBuilder();
    String contextPath = (String) model.get(CONTEXT_PATH);
    if (useCache()) {
      buffer.append(script(contextPath, "/bundle/" + view + ".js", version));
    } else {
      List candidates = group.getResources();
      List resources = new ArrayList();
      for (Resource resource : candidates) {
        if (resource.getType() == ResourceType.JS) {
          buffer.append(script(contextPath, resource.getUri(), null));
          resources.add(resource);
        }
      }
      model.put(resourcesVarName(), resources);
    }
    // 2. Publish as a model attribute.
    model.put(varName(), buffer.toString());
    logger.trace("Publishing {}:\n{}", varName(), buffer);
  }

  /**
   * Generate a script element.
   *
   * @param contextPath The app context path.
   * @param path The location of the file.
   * @param version The version. Optional.
   * @return A script element.
   */
  private String script(final String contextPath, final String path,
      final String version) {
    String script = "\n";
    StringBuilder file = new StringBuilder(contextPath)
        .append(path);
    if (version != null) {
      file.append("?v=").append(version);
    }
    return String.format(script, file.toString());
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected String varName() {
    return VARIABLE_NAME;
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected String resourcesVarName() {
    return RESOURCES;
  }
}