src/com/android/documentsui/picker/ActionHandler.java

/*
 * Copyright (C) 2016 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.documentsui.picker;

import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.provider.Settings;
import android.util.Log;

import com.android.documentsui.AbstractActionHandler;
import com.android.documentsui.Metrics;
import com.android.documentsui.base.DocumentInfo;
import com.android.documentsui.base.DocumentStack;
import com.android.documentsui.base.RootInfo;
import com.android.documentsui.dirlist.DocumentDetails;
import com.android.documentsui.dirlist.FragmentTuner;
import com.android.documentsui.dirlist.Model;
import com.android.documentsui.dirlist.MultiSelectManager;

import javax.annotation.Nullable;

/**
 * Provides {@link PickActivity} action specializations to fragments.
 */
class ActionHandler extends AbstractActionHandler<PickActivity> {

    private static final String TAG = "PickerActionHandler";

    private final FragmentTuner mTuner;
    private final Config mConfig;

    ActionHandler(PickActivity activity, FragmentTuner tuner) {
        super(activity);
        mTuner = tuner;
        mConfig = new Config();
    }

    @Override
    public void showAppDetails(ResolveInfo info) {
        final Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
        intent.setData(Uri.fromParts("package", info.activityInfo.packageName, null));
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_DOCUMENT);
        mActivity.startActivity(intent);
    }

    @Override
    public void openInNewWindow(DocumentStack path) {
        // Open new window support only depends on vanilla Activity, so it is
        // implemented in our parent class. But we don't support that in
        // picking. So as a matter of defensiveness, we override that here.
        throw new UnsupportedOperationException("Can't open in new window");
    }

    @Override
    public void openRoot(RootInfo root) {
        Metrics.logRootVisited(mActivity, root);
        mActivity.onRootPicked(root);
    }

    @Override
    public void openRoot(ResolveInfo info) {
        Metrics.logAppVisited(mActivity, info);
        mActivity.onAppPicked(info);
    }


    @Override
    public boolean viewDocument(DocumentDetails details) {
        return openDocument(details);
    }

    @Override
    public boolean openDocument(DocumentDetails details) {
        DocumentInfo doc = mConfig.model.getDocument(details.getModelId());
        if (doc == null) {
            Log.w(TAG,
                    "Can't view item. No Document available for modeId: " + details.getModelId());
            return false;
        }

        if (mTuner.isDocumentEnabled(doc.mimeType, doc.flags)) {
            mActivity.onDocumentPicked(doc, mConfig.model);
            mConfig.selectionMgr.clearSelection();
            return true;
        }
        return false;
    }

    ActionHandler reset(Model model, MultiSelectManager selectionMgr) {
        mConfig.reset(model, selectionMgr);
        return this;
    }

    private static final class Config {

        @Nullable Model model;
        @Nullable MultiSelectManager selectionMgr;

        public void reset(Model model, MultiSelectManager selectionMgr) {
            assert(model != null);
            assert(selectionMgr != null);

            this.model = model;
            this.selectionMgr = selectionMgr;
        }
    }
}