com.igormaznitsa.mindmap.swing.panel.utils.MiscIcons.java Source code

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Here is the source code for com.igormaznitsa.mindmap.swing.panel.utils.MiscIcons.java

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/*
 * Copyright 2016 Igor Maznitsa.
 *
 * 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.igormaznitsa.mindmap.swing.panel.utils;

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.imageio.ImageIO;
import org.apache.commons.io.IOUtils;
import com.igormaznitsa.meta.annotation.MustNotContainNull;
import com.igormaznitsa.mindmap.model.logger.Logger;
import com.igormaznitsa.mindmap.model.logger.LoggerFactory;

public class MiscIcons {

    private static final Logger LOGGER = LoggerFactory.getLogger(MiscIcons.class);

    private static final String[] ICON_NAMES;

    static {
        final InputStream iconListReadStream = MiscIcons.class
                .getResourceAsStream("/com/igormaznitsa/mindmap/swing/miscicons/icon.lst");
        try {
            ICON_NAMES = IOUtils.readLines(iconListReadStream).toArray(new String[0]);
        } catch (Exception ex) {
            throw new Error("Can't read list of icons", ex);
        } finally {
            IOUtils.closeQuietly(iconListReadStream);
        }
    }

    private static final Map<String, Image> IMAGE_CACHE = new HashMap<String, Image>();

    @Nullable
    private static Image loadImage(@Nonnull final String name) {
        if ("empty".equals(name)) {
            final BufferedImage result = new BufferedImage(32, 32, BufferedImage.TYPE_INT_ARGB);
            return result;
        }
        final InputStream in = MiscIcons.class
                .getResourceAsStream("/com/igormaznitsa/mindmap/swing/miscicons/" + name + ".png");
        if (in == null) {
            return null;
        }
        try {
            return ImageIO.read(in);
        } catch (IOException ex) {
            LOGGER.error("IO exception for icon '" + name + '\'');
            return null;
        } finally {
            IOUtils.closeQuietly(in);
        }
    }

    @Nullable
    public static Image findForName(@Nonnull final String name) {
        synchronized (IMAGE_CACHE) {
            Image img = IMAGE_CACHE.get(name);
            if (img == null) {
                img = loadImage(name);
                if (img != null) {
                    IMAGE_CACHE.put(name, img);
                }
            }
            return img;
        }
    }

    @Nonnull
    @MustNotContainNull
    public static String[] getNames() {
        return ICON_NAMES.clone();
    }
}