src/com/android/mms/model/CarrierContentRestriction.java

/*
 * 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.android.mms.model;

import java.util.ArrayList;

import android.content.ContentResolver;
import android.provider.Settings;

import com.google.android.mms.ContentType;
import com.android.mms.ContentRestrictionException;
import com.android.mms.ExceedMessageSizeException;
import com.android.mms.ResolutionException;
import com.android.mms.UnsupportContentTypeException;

public class CarrierContentRestriction implements ContentRestriction {
    public static final int IMAGE_WIDTH_LIMIT  = 640;
    public static final int IMAGE_HEIGHT_LIMIT = 480;
    public static final int MESSAGE_SIZE_LIMIT = 300 * 1024;

    private static final ArrayList<String> sSupportedImageTypes;
    private static final ArrayList<String> sSupportedAudioTypes;
    private static final ArrayList<String> sSupportedVideoTypes;

    static {
        sSupportedImageTypes = ContentType.getImageTypes();
        sSupportedAudioTypes = ContentType.getAudioTypes();
        sSupportedVideoTypes = ContentType.getVideoTypes();
    }

    public CarrierContentRestriction() {
    }

    public void checkMessageSize(int messageSize, int increaseSize, ContentResolver resolver)
            throws ContentRestrictionException {
        if ( (messageSize < 0) || (increaseSize < 0) ) {
            throw new ContentRestrictionException("Negative message size"
                    + " or increase size");
        }
        int messageSizeLimit;
        try {
            // Don't cache the max message size. Grab it each time so we'll dynamically
            // respond to changes made on the server.
            messageSizeLimit = Integer.parseInt(
                    Settings.Gservices.getString(resolver,
                            Settings.Gservices.MMS_MAXIMUM_MESSAGE_SIZE));
        } catch (java.lang.NumberFormatException e) {
            messageSizeLimit = MESSAGE_SIZE_LIMIT;
        }
        int newSize = messageSize + increaseSize;
        if ( (newSize < 0) || (newSize > messageSizeLimit) ) {
            throw new ExceedMessageSizeException("Exceed message size limitation");
        }
    }

    public void checkResolution(int width, int height) throws ContentRestrictionException {
        if ( (width > IMAGE_WIDTH_LIMIT) || (height > IMAGE_HEIGHT_LIMIT) ) {
            throw new ResolutionException("content resolution exceeds restriction.");
        }
    }

    public void checkImageContentType(String contentType)
            throws ContentRestrictionException {
        if (null == contentType) {
            throw new ContentRestrictionException("Null content type to be check");
        }

        if (!sSupportedImageTypes.contains(contentType)) {
            throw new UnsupportContentTypeException("Unsupported image content type : "
                    + contentType);
        }
    }

    public void checkAudioContentType(String contentType)
            throws ContentRestrictionException {
        if (null == contentType) {
            throw new ContentRestrictionException("Null content type to be check");
        }

        if (!sSupportedAudioTypes.contains(contentType)) {
            throw new UnsupportContentTypeException("Unsupported audio content type : "
                    + contentType);
        }
    }

    public void checkVideoContentType(String contentType)
            throws ContentRestrictionException {
        if (null == contentType) {
            throw new ContentRestrictionException("Null content type to be check");
        }

        if (!sSupportedVideoTypes.contains(contentType)) {
            throw new UnsupportContentTypeException("Unsupported video content type : "
                    + contentType);
        }
    }
}