com.amazonaws.demo.messageboard.MessageQueueAdapter.java Source code

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Here is the source code for com.amazonaws.demo.messageboard.MessageQueueAdapter.java

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/*
 * Copyright 2010-2012 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

package com.amazonaws.demo.messageboard;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.core.type.TypeReference;

import com.amazonaws.services.sqs.model.Message;

import android.content.Context;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class MessageQueueAdapter extends ArrayAdapter<Message> {

    protected List<Message> messages = new ArrayList<Message>(1000);

    public MessageQueueAdapter(Context context, int resourceId) {
        super(context, resourceId);
    }

    public int getCount() {
        return this.messages.size();
    }

    public Message getItem(int pos) {
        return this.messages.get(pos);
    }

    public String getMessageText(int pos) {
        String messageText = "";

        Message message = this.getItem(pos);
        if (message != null && message.getBody() != null) {
            messageText = this.extractMessageFromJsonObject(message.getBody());
        }

        return messageText;
    }

    public void removeItemAt(int pos) {
        this.messages.remove(pos);
    }

    public View getView(int pos, View convertView, ViewGroup parent) {
        TextView messageText = new TextView(parent.getContext());
        messageText.setText(this.getMessageText(pos));
        messageText.setGravity(Gravity.LEFT);
        messageText.setPadding(10, 10, 10, 10);
        messageText.setMaxWidth(200);
        messageText.setMinWidth(200);
        messageText.setTextSize(16);

        return messageText;
    }

    private String extractMessageFromJsonObject(String json) {
        try {
            ObjectMapper mapper = new ObjectMapper();
            Map<String, Object> jsonDic = mapper.readValue(json, new TypeReference<Map<String, Object>>() {
            });

            return (String) jsonDic.get("Message");
        } catch (Exception exception) {
            return null;
        }
    }

    public List<Message> getMessages() {
        return messages;
    }
}