alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Android example source code file (PduCache.java)

This example Android source code file (PduCache.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

android, content, hashmap, hashset, local_logv, mms_all_id, mms_conversation_id, mms_drafts_id, mms_inbox_id, mms_outbox_id, mms_sent_id, network, override, pducache, pducacheentry, string, uri, util, utilities, utils

The PduCache.java Android example source code

/*
 * Copyright (C) 2008 Esmertec AG.
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License 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.google.android.mms.util;

import android.content.ContentUris;
import android.content.UriMatcher;
import android.net.Uri;
import android.provider.Telephony.Mms;
import android.util.Config;
import android.util.Log;

import java.util.HashMap;
import java.util.HashSet;

public final class PduCache extends AbstractCache<Uri, PduCacheEntry> {
    private static final String TAG = "PduCache";
    private static final boolean DEBUG = false;
    private static final boolean LOCAL_LOGV = DEBUG ? Config.LOGD : Config.LOGV;

    private static final int MMS_ALL             = 0;
    private static final int MMS_ALL_ID          = 1;
    private static final int MMS_INBOX           = 2;
    private static final int MMS_INBOX_ID        = 3;
    private static final int MMS_SENT            = 4;
    private static final int MMS_SENT_ID         = 5;
    private static final int MMS_DRAFTS          = 6;
    private static final int MMS_DRAFTS_ID       = 7;
    private static final int MMS_OUTBOX          = 8;
    private static final int MMS_OUTBOX_ID       = 9;
    private static final int MMS_CONVERSATION    = 10;
    private static final int MMS_CONVERSATION_ID = 11;

    private static final UriMatcher URI_MATCHER;
    private static final HashMap<Integer, Integer> MATCH_TO_MSGBOX_ID_MAP;

    private static PduCache sInstance;

    static {
        URI_MATCHER = new UriMatcher(UriMatcher.NO_MATCH);
        URI_MATCHER.addURI("mms", null,         MMS_ALL);
        URI_MATCHER.addURI("mms", "#",          MMS_ALL_ID);
        URI_MATCHER.addURI("mms", "inbox",      MMS_INBOX);
        URI_MATCHER.addURI("mms", "inbox/#",    MMS_INBOX_ID);
        URI_MATCHER.addURI("mms", "sent",       MMS_SENT);
        URI_MATCHER.addURI("mms", "sent/#",     MMS_SENT_ID);
        URI_MATCHER.addURI("mms", "drafts",     MMS_DRAFTS);
        URI_MATCHER.addURI("mms", "drafts/#",   MMS_DRAFTS_ID);
        URI_MATCHER.addURI("mms", "outbox",     MMS_OUTBOX);
        URI_MATCHER.addURI("mms", "outbox/#",   MMS_OUTBOX_ID);
        URI_MATCHER.addURI("mms-sms", "conversations",   MMS_CONVERSATION);
        URI_MATCHER.addURI("mms-sms", "conversations/#", MMS_CONVERSATION_ID);

        MATCH_TO_MSGBOX_ID_MAP = new HashMap<Integer, Integer>();
        MATCH_TO_MSGBOX_ID_MAP.put(MMS_INBOX,  Mms.MESSAGE_BOX_INBOX);
        MATCH_TO_MSGBOX_ID_MAP.put(MMS_SENT,   Mms.MESSAGE_BOX_SENT);
        MATCH_TO_MSGBOX_ID_MAP.put(MMS_DRAFTS, Mms.MESSAGE_BOX_DRAFTS);
        MATCH_TO_MSGBOX_ID_MAP.put(MMS_OUTBOX, Mms.MESSAGE_BOX_OUTBOX);
    }

    private final HashMap<Integer, HashSet mMessageBoxes;
    private final HashMap<Long, HashSet mThreads;

    private PduCache() {
        mMessageBoxes = new HashMap<Integer, HashSet();
        mThreads = new HashMap<Long, HashSet();
    }

    synchronized public static final PduCache getInstance() {
        if (sInstance == null) {
            if (LOCAL_LOGV) {
                Log.v(TAG, "Constructing new PduCache instance.");
            }
            sInstance = new PduCache();
        }
        return sInstance;
    }

    @Override
    synchronized public boolean put(Uri uri, PduCacheEntry entry) {
        int msgBoxId = entry.getMessageBox();
        HashSet<Uri> msgBox = mMessageBoxes.get(msgBoxId);
        if (msgBox == null) {
            msgBox = new HashSet<Uri>();
            mMessageBoxes.put(msgBoxId, msgBox);
        }

        long threadId = entry.getThreadId();
        HashSet<Uri> thread = mThreads.get(threadId);
        if (thread == null) {
            thread = new HashSet<Uri>();
            mThreads.put(threadId, thread);
        }

        Uri finalKey = normalizeKey(uri);
        boolean result = super.put(finalKey, entry);
        if (result) {
            msgBox.add(finalKey);
            thread.add(finalKey);
        }
        return result;
    }

    @Override
    synchronized public PduCacheEntry purge(Uri uri) {
        int match = URI_MATCHER.match(uri);
        switch (match) {
            case MMS_ALL_ID:
                return purgeSingleEntry(uri);
            case MMS_INBOX_ID:
            case MMS_SENT_ID:
            case MMS_DRAFTS_ID:
            case MMS_OUTBOX_ID:
                String msgId = uri.getLastPathSegment();
                return purgeSingleEntry(Uri.withAppendedPath(Mms.CONTENT_URI, msgId));
            // Implicit batch of purge, return null.
            case MMS_ALL:
            case MMS_CONVERSATION:
                purgeAll();
                return null;
            case MMS_INBOX:
            case MMS_SENT:
            case MMS_DRAFTS:
            case MMS_OUTBOX:
                purgeByMessageBox(MATCH_TO_MSGBOX_ID_MAP.get(match));
                return null;
            case MMS_CONVERSATION_ID:
                purgeByThreadId(ContentUris.parseId(uri));
                return null;
            default:
                return null;
        }
    }

    private PduCacheEntry purgeSingleEntry(Uri key) {
        PduCacheEntry entry = super.purge(key);
        if (entry != null) {
            removeFromThreads(key, entry);
            removeFromMessageBoxes(key, entry);
            return entry;
        }
        return null;
    }

    @Override
    synchronized public void purgeAll() {
        super.purgeAll();

        mMessageBoxes.clear();
        mThreads.clear();
    }

    /**
     * @param uri The Uri to be normalized.
     * @return Uri The normalized key of cached entry.
     */
    private Uri normalizeKey(Uri uri) {
        int match = URI_MATCHER.match(uri);
        Uri normalizedKey = null;

        switch (match) {
            case MMS_ALL_ID:
                normalizedKey = uri;
                break;
            case MMS_INBOX_ID:
            case MMS_SENT_ID:
            case MMS_DRAFTS_ID:
            case MMS_OUTBOX_ID:
                String msgId = uri.getLastPathSegment();
                normalizedKey = Uri.withAppendedPath(Mms.CONTENT_URI, msgId);
                break;
            default:
                return null;
        }

        if (LOCAL_LOGV) {
            Log.v(TAG, uri + " -> " + normalizedKey);
        }
        return normalizedKey;
    }

    private void purgeByMessageBox(Integer msgBoxId) {
        if (LOCAL_LOGV) {
            Log.v(TAG, "Purge cache in message box: " + msgBoxId);
        }

        if (msgBoxId != null) {
            HashSet<Uri> msgBox = mMessageBoxes.remove(msgBoxId);
            if (msgBox != null) {
                for (Uri key : msgBox) {
                    PduCacheEntry entry = super.purge(key);
                    if (entry != null) {
                        removeFromThreads(key, entry);
                    }
                }
            }
        }
    }

    private void removeFromThreads(Uri key, PduCacheEntry entry) {
        HashSet<Uri> thread = mThreads.get(entry.getThreadId());
        if (thread != null) {
            thread.remove(key);
        }
    }

    private void purgeByThreadId(long threadId) {
        if (LOCAL_LOGV) {
            Log.v(TAG, "Purge cache in thread: " + threadId);
        }

        HashSet<Uri> thread = mThreads.remove(threadId);
        if (thread != null) {
            for (Uri key : thread) {
                PduCacheEntry entry = super.purge(key);
                if (entry != null) {
                    removeFromMessageBoxes(key, entry);
                }
            }
        }
    }

    private void removeFromMessageBoxes(Uri key, PduCacheEntry entry) {
        HashSet<Uri> msgBox = mThreads.get(entry.getMessageBox());
        if (msgBox != null) {
            msgBox.remove(key);
        }
    }
}

Other Android examples (source code examples)

Here is a short list of links related to this Android PduCache.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.