src/com/android/camera/gallery/UriImage.java

/*
 * Copyright (C) 2009 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.camera.gallery;

import com.android.camera.BitmapManager;
import com.android.camera.Util;

import android.content.ContentResolver;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.ParcelFileDescriptor;
import android.util.Log;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.InputStream;

class UriImage implements IImage {
    private static final String TAG = "UriImage";
    private final Uri mUri;
    private final BaseImageList mContainer;
    private final ContentResolver mContentResolver;

    UriImage(BaseImageList container, ContentResolver cr, Uri uri) {
        mContainer = container;
        mContentResolver = cr;
        mUri = uri;
    }

    public String getDataPath() {
        return mUri.getPath();
    }

    private InputStream getInputStream() {
        try {
            if (mUri.getScheme().equals("file")) {
                String path = mUri.getPath();
                return new java.io.FileInputStream(mUri.getPath());
            } else {
                return mContentResolver.openInputStream(mUri);
            }
        } catch (FileNotFoundException ex) {
            return null;
        }
    }

    private ParcelFileDescriptor getPFD() {
        try {
            if (mUri.getScheme().equals("file")) {
                String path = mUri.getPath();
                return ParcelFileDescriptor.open(new File(path),
                        ParcelFileDescriptor.MODE_READ_ONLY);
            } else {
                return mContentResolver.openFileDescriptor(mUri, "r");
            }
        } catch (FileNotFoundException ex) {
            return null;
        }
    }

    public Bitmap fullSizeBitmap(int targetWidthHeight) {
        return fullSizeBitmap(targetWidthHeight, IImage.ROTATE_AS_NEEDED,
                IImage.NO_NATIVE);
    }

    public Bitmap fullSizeBitmap(int targetWidthHeight, boolean rotateAsNeeded,
            boolean useNative) {
        try {
            ParcelFileDescriptor pfdInput = getPFD();
            Bitmap b = Util.makeBitmap(targetWidthHeight, pfdInput,
                    useNative);
            return b;
        } catch (Exception ex) {
            Log.e(TAG, "got exception decoding bitmap ", ex);
            return null;
        }
    }

    final class LoadBitmapCancelable extends BaseCancelable<Bitmap> {
        ParcelFileDescriptor mPfdInput;
        BitmapFactory.Options mOptions;
        int mTargetWidthOrHeight;

        public LoadBitmapCancelable(ParcelFileDescriptor pfd,
                int targetWidthOrHeight, BitmapFactory.Options options) {
            mPfdInput = pfd;
            mTargetWidthOrHeight = targetWidthOrHeight;
            if (options != null) {
                mOptions = options;
           } else {
                mOptions = new BitmapFactory.Options();
           }
        }

        @Override
        public boolean requestCancel() {
            if (super.requestCancel()) {
                mOptions.requestCancelDecode();
                return true;
            }
            return false;
        }

        @Override
        protected Bitmap execute() {
            try {
                Bitmap b = Util.makeBitmap(mTargetWidthOrHeight,
                        fullSizeImageUri(), mContentResolver, mPfdInput,
                        mOptions);
                return b;
            } catch (Exception ex) {
                return null;
            }
        }
    }

    public Cancelable<Bitmap> fullSizeBitmapCancelable(
            int targetWidthOrHeight, BitmapFactory.Options options) {
        try {
            ParcelFileDescriptor pfdInput = getPFD();
            if (pfdInput == null) return null;
            return new LoadBitmapCancelable(pfdInput,
                    targetWidthOrHeight, options);
        } catch (UnsupportedOperationException ex) {
            return null;
        }
    }

    public Uri fullSizeImageUri() {
        return mUri;
    }

    public InputStream fullSizeImageData() {
        return getInputStream();
    }

    public Bitmap miniThumbBitmap() {
        return thumbBitmap();
    }

    public String getTitle() {
        return mUri.toString();
    }

    public String getDisplayName() {
        return getTitle();
    }

    public Bitmap thumbBitmap() {
        return fullSizeBitmap(THUMBNAIL_TARGET_SIZE);
    }

    private BitmapFactory.Options snifBitmapOptions() {
        ParcelFileDescriptor input = getPFD();
        if (input == null) return null;
        try {
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inJustDecodeBounds = true;
            BitmapManager.instance().decodeFileDescriptor(
                    input.getFileDescriptor(), options);
            return options;
        } finally {
            Util.closeSilently(input);
        }
    }

    public String getMimeType() {
        BitmapFactory.Options options = snifBitmapOptions();
        return (options != null) ? options.outMimeType : "";
    }

    public int getHeight() {
        BitmapFactory.Options options = snifBitmapOptions();
        return (options != null) ? options.outHeight : 0;
    }

    public int getWidth() {
        BitmapFactory.Options options = snifBitmapOptions();
        return (options != null) ? options.outWidth : 0;
    }

    public long fullSizeImageId() {
        return 0;
    }

    public IImageList getContainer() {
        return mContainer;
    }

    public long getDateTaken() {
        return 0;
    }

    public int getRow() {
        return 0;
    }

    public boolean isReadonly() {
        return true;
    }

    public boolean isDrm() {
        return false;
    }

    public boolean rotateImageBy(int degrees) {
        return false;
    }

    public void setTitle(String name) {
        throw new UnsupportedOperationException();
    }

    public Uri thumbUri() {
        throw new UnsupportedOperationException();
    }
}