com.android.tools.idea.npw.template.IconLoader.java Source code

Introduction

Here is the source code for com.android.tools.idea.npw.template.IconLoader.java

Source

/*
 * Copyright (C) 2015 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.tools.idea.npw.template;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.intellij.openapi.diagnostic.Logger;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Optional;

/**
 * Guava {@link CacheLoader} which can convert a file path to an icon. This is used to help us
 * load standard 256x256 icons out of template files.
 */
final class IconLoader extends CacheLoader<File, Optional<Icon>> {

    public static LoadingCache<File, Optional<Icon>> createLoadingCache() {
        return CacheBuilder.newBuilder().build(new IconLoader());
    }

    private static Logger getLog() {
        return Logger.getInstance(IconLoader.class);
    }

    @Nullable
    @Override
    public Optional<Icon> load(@NotNull File iconPath) {
        try {
            if (iconPath.isFile()) {
                BufferedImage image = ImageIO.read(iconPath);
                if (image != null) {
                    return Optional.of(new ImageIcon(image.getScaledInstance(256, 256, Image.SCALE_SMOOTH)));
                } else {
                    getLog().warn("File " + iconPath.getAbsolutePath() + " exists but is not a valid image");
                }
            } else {
                getLog().warn("Image file " + iconPath.getAbsolutePath() + " was not found");
            }
        } catch (IOException e) {
            getLog().warn(e);
        }
        return Optional.empty();
    }
}