Subversion Repositories SmartDukaan

/**

 * Copyright 2010-present Facebook.

 *

 * 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.facebook.internal;

import android.content.Context;

import android.net.Uri;

import java.net.URI;

import java.net.URISyntaxException;

public class ImageRequest {

    public interface Callback {

        /**

         * This method should always be called on the UI thread. ImageDownloader makes

         * sure to do this when it is responsible for issuing the ImageResponse

         * @param response

         */

        void onCompleted(ImageResponse response);

    }

    public static final int UNSPECIFIED_DIMENSION = 0;

    private static final String PROFILEPIC_URL_FORMAT =

            "https://graph.facebook.com/%s/picture";

    private static final String HEIGHT_PARAM = "height";

    private static final String WIDTH_PARAM = "width";

    private static final String MIGRATION_PARAM = "migration_overrides";

    private static final String MIGRATION_VALUE = "{october_2012:true}";

    private Context context;

    private URI imageUri;

    private Callback callback;

    private boolean allowCachedRedirects;

    private Object callerTag;

    public static URI getProfilePictureUrl(

            String userId,

            int width,

            int height)

            throws URISyntaxException {

        Validate.notNullOrEmpty(userId, "userId");

        width = Math.max(width, UNSPECIFIED_DIMENSION);

        height = Math.max(height, UNSPECIFIED_DIMENSION);

        if (width == UNSPECIFIED_DIMENSION && height == UNSPECIFIED_DIMENSION) {

            throw new IllegalArgumentException("Either width or height must be greater than 0");

        }

        Uri.Builder builder = new Uri.Builder().encodedPath(String.format(PROFILEPIC_URL_FORMAT, userId));

        if (height != UNSPECIFIED_DIMENSION) {

            builder.appendQueryParameter(HEIGHT_PARAM, String.valueOf(height));

        }

        if (width != UNSPECIFIED_DIMENSION) {

            builder.appendQueryParameter(WIDTH_PARAM, String.valueOf(width));

        }

        builder.appendQueryParameter(MIGRATION_PARAM, MIGRATION_VALUE);

        return new URI(builder.toString());

    }

    private ImageRequest(Builder builder) {

        this.context = builder.context;

        this.imageUri = builder.imageUrl;

        this.callback = builder.callback;

        this.allowCachedRedirects = builder.allowCachedRedirects;

        this.callerTag = builder.callerTag == null ? new Object() : builder.callerTag;

    }

    public Context getContext() {

        return context;

    }

    public URI getImageUri() {

        return imageUri;

    }

    public Callback getCallback() {

        return callback;

    }

    public boolean isCachedRedirectAllowed() {

        return allowCachedRedirects;

    }

    public Object getCallerTag() {

        return callerTag;

    }

    public static class Builder {

        // Required

        private Context context;

        private URI imageUrl;

        // Optional

        private Callback callback;

        private boolean allowCachedRedirects;

        private Object callerTag;

        public Builder(Context context, URI imageUrl) {

            Validate.notNull(imageUrl, "imageUrl");

            this.context = context;

            this.imageUrl = imageUrl;

        }

        public Builder setCallback(Callback callback) {

            this.callback = callback;

            return this;

        }

        public Builder setCallerTag(Object callerTag) {

            this.callerTag = callerTag;

            return this;

        }

        public Builder setAllowCachedRedirects(boolean allowCachedRedirects) {

            this.allowCachedRedirects = allowCachedRedirects;

            return this;

        }

        public ImageRequest build() {

            return new ImageRequest(this);

        }

    }

}