com.sepgil.ral.FetchNodeTask.java Source code

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Here is the source code for com.sepgil.ral.FetchNodeTask.java

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package com.sepgil.ral;

/**
 * This file is part of RestWS Android Library (RAL).
 * RAL is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * RAL is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with RAL.  If not, see <http://www.gnu.org/licenses/>.
 */

import org.apache.http.HttpStatus;
import org.apache.http.StatusLine;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpRequestBase;
import org.json.JSONException;
import org.json.JSONObject;

/**
 * Fetches a node.
 * @author Sebastian Gilits
 *
 */
public class FetchNodeTask extends DrupalOperationTask {
    public enum ErrorState {
        ERROR_PARSE, ERROR_HTTP,
    }

    private int mNodeID;
    private OnNodeFetchedListener mListener = null;

    /**
     * Create a new task which should fetch the node with the given node.
     * @param nodeID The node id of the node, which should be fetched.
     */
    public FetchNodeTask(int nodeID) {
        mNodeID = nodeID;
    }

    /**
     * Register a callback to be invoked when the node was fetched.
     * @param listener The callback that will run.
     */
    public void setOnNodeFetchedListener(OnNodeFetchedListener listener) {
        mListener = listener;
    }

    @Override
    public String getPath() {
        return "/node/" + mNodeID;
    }

    @Override
    public HttpRequestBase getHttpRequest(String url) {
        return new HttpGet(url);
    }

    @Override
    public void onResponse(JSONObject response) {
        if (mListener == null)
            return;
        try {
            mListener.onNodeFetched(new Node(response));
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            mListener.onError(ErrorState.ERROR_PARSE);
        }
    }

    @Override
    public void onJSONError(JSONException e) {
        if (mListener == null)
            return;
        mListener.onError(ErrorState.ERROR_PARSE);
    }

    @Override
    public void onHttpError(StatusLine statusLine) {
        if (mListener == null)
            return;
        switch (statusLine.getStatusCode()) {
        case HttpStatus.SC_FORBIDDEN:
            mListener.onNoAccess(mNodeID);
            break;
        case HttpStatus.SC_NOT_FOUND:
            mListener.onNotFound(mNodeID);
            break;
        default:
            mListener.onError(ErrorState.ERROR_HTTP);
        }

    }

    @Override
    public void onParserError(Exception e) {
        if (mListener == null)
            return;
        mListener.onError(ErrorState.ERROR_PARSE);
    }

    /**
     * Interface definition for a callback to be invoked when the node was fetched (or not).
     * @author Sebastian Gilits
     *
     */
    public interface OnNodeFetchedListener {
        public void onNodeFetched(Node node);

        public void onNoAccess(int nid);

        public void onNotFound(int nid);

        public void onError(ErrorState error);
    }
}