Android Open Source - Billy Custom String Request

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License

The source code is released under:

GNU General Public License

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Java Source Code

package com.vibin.billy;
/* w w w  .j ava2 s  .c o m*/
import android.util.Log;

import com.android.volley.Cache;
import com.android.volley.NetworkResponse;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.toolbox.HttpHeaderParser;

import java.io.UnsupportedEncodingException;
import java.util.Map;

public class CustomStringRequest extends Request<String> {
    private final Response.Listener<String> mListener;
    private static final String TAG = CustomStringRequest.class.getSimpleName();
    public CustomStringRequest(int method, String url, Response.Listener<String> listener, Response.ErrorListener errorListener) {
        super(method, url, errorListener);
        mListener = listener;
    }

    @Override
    protected Response<String> parseNetworkResponse(NetworkResponse response) {
        String parsed="";
        try {
            parsed = new String(response.data, HttpHeaderParser.parseCharset(response.headers));
        } catch (UnsupportedEncodingException e) {
            Log.d(TAG, e.toString());
        }
        return Response.success(parsed,parseIgnoreCacheHeaders(response));
    }

    @Override
    protected void deliverResponse(String response) {
        mListener.onResponse(response);
    }

    /**
     * Extracts a {@link Cache.Entry} from a {@link NetworkResponse}.
     * Cache-control headers are ignored. SoftTtl == 3 mins, ttl == 24 hours.
     * @param response The network response to parse headers from
     * @return a cache entry for the given response, or null if the response is not cacheable.
     */
    public static Cache.Entry parseIgnoreCacheHeaders(NetworkResponse response) {
        long now = System.currentTimeMillis();

        Map<String, String> headers = response.headers;
        long serverDate = 0;
        String serverEtag = null;
        String headerValue;

        headerValue = headers.get("Date");
        if (headerValue != null) {
            serverDate = HttpHeaderParser.parseDateAsEpoch(headerValue);
        }

        serverEtag = headers.get("ETag");

        final long cacheHitButRefreshed = 12 * 60 * 60 * 1000; // in 12 hours cache will be hit, but also refreshed on background
        final long cacheExpired = 24 * 60 * 60 * 1000; // in 24 hours this cache entry expires completely
        final long softExpire = now + cacheHitButRefreshed;
        final long ttl = now + cacheExpired;

        Cache.Entry entry = new Cache.Entry();
        entry.data = response.data;
        entry.etag = serverEtag;
        entry.softTtl = softExpire;
        entry.ttl = ttl;
        entry.serverDate = serverDate;
        entry.responseHeaders = headers;

        return entry;
    }

}

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