Amazon CloudSearch结构化查询解析器

Question

I need to parse Amazon CloudSearch "structured" queries, but could not find any related source. Does anyone know a parser to parse these queries?

Related documentation : http://docs.aws.amazon.com/cloudsearch/latest/developerguide/searching-compound-queries.html

Answer 1

Awsome has a very handy query builder for structured queries. The idea is to build the structured query string as

(and ('title:'star' (or actors:'Harrison Ford' actors:'William Shatner')

using an utility builder which takes field, value and the operator {and, or, eq, prefix etc.} and constructs the query. a simple example implementation of the query looks this like

class QueryBuilder {
    String field;
    String value;
    String operator;
    Set<QueryBuilder> queries;

    public QueryBuilder(String field, String value) {
         this.field = field;
         this.value = value;
    }

    public QueryBuilder(String field, String value, String operator, 
             QueryBuilder... queries) {
         this.field = field;
         this.value = value;
         this.operator = operator;
         this.queries = queries;
    }

    public static QueryBuilder and(QueryBuilder.. expr) {
         this("and", queries);
    }

    public static QueryBuilder or(QueryBuilder.. expr) {
         this("or", queries);
    }

    public String toString() {
        if(queries == null || queries.isEmpty() {
            ImmutableSet<String> queryParts = ImmutableSet.of("(",
                    operator, "field=", field, value, ")");
            return Joiner.on(' ').join(queryParts);
        } else {
            //nested queries for an operator
            String nestedQuery = Joiner.on(' ').join(queries);
            ImmutableSet<String> queryParts = ImmutableSet.of("(",
                     operator.toString(), nestedQuery, ")");
            return Joiner.on(' ').join(queryParts);
        }
    }
}

In your code simply call

QueryBuilder builder = QueryBuidler.and(new QueryBuilder("title", "star"), 
        QueryBuilder.or(new QueryBuilder("actors", "Harrison Ford"), 
            new QueryBuilder("actors", "William Shatner")));
String query = builder.toString();