LangFtlUtil.java 文件源码

/**
 * Combines two maps with the given operator into a new hash.
 */
public static TemplateHashModelEx combineMaps(TemplateHashModelEx first, TemplateHashModelEx second, SetOperations ops, 
        ObjectWrapper objectWrapper) throws TemplateModelException {
    SimpleHash res = new SimpleHash(objectWrapper);
    if (ops == null || ops == SetOperations.UNION) {
        // this is less efficient than freemarker + operator, but provides the "alternative" implementation, so have choice
        addToSimpleMap(res, first);
        addToSimpleMap(res, second);
    }
    else if (ops == SetOperations.INTERSECT) {
        Set<String> intersectKeys = toStringSet(second.keys());
        intersectKeys.retainAll(toStringSet(first.keys()));
        addToSimpleMap(res, second, intersectKeys);
    }
    else if (ops == SetOperations.DIFFERENCE) {
        Set<String> diffKeys = toStringSet(first.keys());
        diffKeys.removeAll(toStringSet(second.keys()));
        addToSimpleMap(res, first, diffKeys);
    }
    else {
        throw new TemplateModelException("Unsupported combineMaps operation");
    }
    return res;
}