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sphere-java-client
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package io.sphere.internal.request;

import io.sphere.client.SortDirection;
import io.sphere.internal.util.Util;
import io.sphere.client.QueryRequest;

import com.google.common.util.concurrent.ListenableFuture;
import io.sphere.client.model.QueryResult;
import org.codehaus.jackson.type.TypeReference;

import static com.google.common.base.Strings.isNullOrEmpty;

public class QueryRequestImpl implements QueryRequest, TestableRequest {
    RequestHolder> requestHolder;
    TypeReference> jsonParserTypeRef;
    private String where = "";
    private String sort = "";
    private int pageSize = 25;
    private int page = 0;

    public QueryRequestImpl(RequestHolder> requestHolder, TypeReference> jsonParserTypeRef) {
        this.requestHolder = requestHolder;
        this.jsonParserTypeRef = jsonParserTypeRef;
    }

    @Override public QueryRequest where(String predicate) {
        if(predicate != null) {
            where = predicate;
        } else {
            where = "";
        }
        return this;
    }

    @Override
    public QueryRequest sort(String fieldName, SortDirection sortDirection) {
        if(fieldName != null && sortDirection != null) {
            this.sort = fieldName + " " + sortDirection.toString().toLowerCase();
        } else {
            this.sort = "";
        }
        return this;
    }

    @Override public QueryRequest page(int page) {
        // added to the query parameters in fetchAsync()
        this.page = page;
        return this;
    }

    @Override public QueryRequest pageSize(int pageSize) {
        // added to the query parameters in fetchAsync()
        this.pageSize = pageSize;
        return this;
    }

    @Override public QueryResult fetch() {
        return Util.sync(fetchAsync());
    }

    @Override public ListenableFuture> fetchAsync() {
        if(!isNullOrEmpty(where)) {
            requestHolder.addQueryParameter("where",  where);
        }
        if(!isNullOrEmpty(sort)) {
            requestHolder.addQueryParameter("sort",  sort);
        }
        requestHolder.addQueryParameter("limit", Integer.toString(this.pageSize));
        requestHolder.addQueryParameter("offset", Integer.toString(this.page * this.pageSize));
        return RequestExecutor.executeAndThrowOnError(requestHolder, jsonParserTypeRef);
    }

    @Override public QueryRequest expand(String... paths) {
        for (String path: paths) {
            requestHolder.addQueryParameter("expand", path);
        }
        return this;
    }

    @Override public TestableRequestHolder getRequestHolder() {
        return requestHolder;
    }

    // logging and debugging purposes
    @Override public String toString() {
        return getRequestHolder().toString();
    }
}