import org.wso2.balana.finder.impl.SelectorModule; //导入依赖的package包/类
/**
 * Helper method to init engine
 */
private void setUpAttributeFinders() {

    // Creates carbon attribute finder instance  and init it
    carbonAttributeFinder = new CarbonAttributeFinder(tenantId);
    carbonAttributeFinder.init();

    // Now setup attribute finder modules for the current date/time and
    // AttributeSelectors (selectors are optional, but this project does
    // support a basic implementation)
    CurrentEnvModule envAttributeModule = new CurrentEnvModule();
    SelectorModule selectorAttributeModule = new SelectorModule();

    attributeModules.add(carbonAttributeFinder);
    attributeModules.add(envAttributeModule);
    attributeModules.add(selectorAttributeModule);

    for (AttributeFinderModule module : balana.getPdpConfig().getAttributeFinder().getModules()) {
        if (module instanceof CurrentEnvModule || module instanceof SelectorModule) {
            continue;
        }
        attributeModules.add(module);
    }
}