com.facebook.react.views.imagehelper.ResourceDrawableIdHelper.java Source code

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Here is the source code for com.facebook.react.views.imagehelper.ResourceDrawableIdHelper.java

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/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

package com.facebook.react.views.imagehelper;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import androidx.annotation.Nullable;
import java.util.HashMap;
import java.util.Map;
import javax.annotation.concurrent.ThreadSafe;

/** Helper class for obtaining information about local images. */
@ThreadSafe
public class ResourceDrawableIdHelper {

    private Map<String, Integer> mResourceDrawableIdMap;

    private static final String LOCAL_RESOURCE_SCHEME = "res";
    private static volatile ResourceDrawableIdHelper sResourceDrawableIdHelper;

    private ResourceDrawableIdHelper() {
        mResourceDrawableIdMap = new HashMap<String, Integer>();
    }

    public static ResourceDrawableIdHelper getInstance() {
        if (sResourceDrawableIdHelper == null) {
            synchronized (ResourceDrawableIdHelper.class) {
                if (sResourceDrawableIdHelper == null) {
                    sResourceDrawableIdHelper = new ResourceDrawableIdHelper();
                }
            }
        }
        return sResourceDrawableIdHelper;
    }

    public synchronized void clear() {
        mResourceDrawableIdMap.clear();
    }

    public int getResourceDrawableId(Context context, @Nullable String name) {
        if (name == null || name.isEmpty()) {
            return 0;
        }
        name = name.toLowerCase().replace("-", "_");

        // name could be a resource id.
        try {
            return Integer.parseInt(name);
        } catch (NumberFormatException e) {
            // Do nothing.
        }

        synchronized (this) {
            if (mResourceDrawableIdMap.containsKey(name)) {
                return mResourceDrawableIdMap.get(name);
            }
            int id = context.getResources().getIdentifier(name, "drawable", context.getPackageName());
            mResourceDrawableIdMap.put(name, id);
            return id;
        }
    }

    public @Nullable Drawable getResourceDrawable(Context context, @Nullable String name) {
        int resId = getResourceDrawableId(context, name);
        return resId > 0 ? context.getResources().getDrawable(resId) : null;
    }

    public Uri getResourceDrawableUri(Context context, @Nullable String name) {
        int resId = getResourceDrawableId(context, name);
        return resId > 0 ? new Uri.Builder().scheme(LOCAL_RESOURCE_SCHEME).path(String.valueOf(resId)).build()
                : Uri.EMPTY;
    }
}