import org.apache.tapestry5.internal.InternalConstants; //导入依赖的package包/类
protected SymbolProvider createSymbolProvider(Map<String, String> diSymbols) {

        Map<String, String> params = new HashMap<>(diSymbols);

        // override DI symbols if set explicitly in the factory
        if (productionMode != null) {
            params.put(SymbolConstants.PRODUCTION_MODE, Boolean.toString(productionMode));
        }

        if (executionModes != null) {
            params.put(SymbolConstants.EXECUTION_MODE, executionModes);
        }

        if (charset != null) {
            params.put(SymbolConstants.CHARSET, charset);
        }

        if (appPackage != null) {
            params.put(InternalConstants.TAPESTRY_APP_PACKAGE_PARAM, appPackage);
        } else {
            // sanity check
            if (!params.containsKey(InternalConstants.TAPESTRY_APP_PACKAGE_PARAM)) {
                throw new IllegalStateException("Tapestry app package is not defined. Use 'tapestry.appPackage' config " +
                        "or inject 'tapestry.app-package' symbol with this value.");
            }
        }

        if (supportedLocales != null) {
            params.put(SymbolConstants.SUPPORTED_LOCALES, supportedLocales);
        }

        // provide default values for symbols if not defined in DI
        if (!params.containsKey(SymbolConstants.GZIP_COMPRESSION_ENABLED)) {
            // compression should be configured at the Jetty level
            params.put(SymbolConstants.GZIP_COMPRESSION_ENABLED, "false");
        }

        return new MapSymbolProvider(params);
    }
 

import org.apache.tapestry5.internal.InternalConstants; //导入依赖的package包/类
@Contribute(SymbolProvider.class)
@ApplicationDefaults
public static void defaultsSymbols(MappedConfiguration<String, Object> configuration)
{
    configuration.add(InternalConstants.TAPESTRY_APP_PACKAGE_PARAM, JpaTestModule.class.getPackage().getName());
    // configuration.add(InternalSymbols.APP_PACKAGE_PATH, "org/tynamo/model/jpa");
}
 

import org.apache.tapestry5.internal.InternalConstants; //导入依赖的package包/类
public ContentType getTransformedContentType() {
  return InternalConstants.JAVASCRIPT_CONTENT_TYPE;
}
 

import org.apache.tapestry5.internal.InternalConstants; //导入依赖的package包/类
@Override
public ContentType getTransformedContentType() {
  return InternalConstants.JAVASCRIPT_CONTENT_TYPE;
}
 

import org.apache.tapestry5.internal.InternalConstants; //导入依赖的package包/类
public ContentType getContentType() {		
	String type = response.getHeader(InternalConstants.CONTENT_TYPE_ATTRIBUTE_NAME);

	return new ContentType(type);
}