ImageVisualAttributePlugin.java

/*
 * 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.plugins.attributes.images;

import java.awt.Image;
import java.io.ByteArrayInputStream;
import java.util.Map;
import java.util.WeakHashMap;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.imageio.ImageIO;
import javax.xml.bind.DatatypeConverter;
import com.igormaznitsa.mindmap.model.Topic;
import com.igormaznitsa.mindmap.model.logger.Logger;
import com.igormaznitsa.mindmap.model.logger.LoggerFactory;
import com.igormaznitsa.mindmap.plugins.api.MindMapPlugin;
import com.igormaznitsa.mindmap.plugins.api.VisualAttributePlugin;
import com.igormaznitsa.mindmap.swing.panel.MindMapPanel;
import com.igormaznitsa.mindmap.swing.panel.MindMapPanelConfig;
import com.igormaznitsa.mindmap.plugins.api.Renderable;

public class ImageVisualAttributePlugin implements VisualAttributePlugin {

  public static final String ATTR_KEY = "mmd.image";

  private static final Logger LOGGER = LoggerFactory.getLogger(ImageVisualAttributePlugin.class);
  private static final Map<Topic, Renderable> CACHED_IMAGES = new WeakHashMap<Topic, Renderable>();

  public static void clearCachedImages() {
    CACHED_IMAGES.clear();
  }

  @Override
  @Nullable
  public Renderable getScaledImage(@Nonnull final MindMapPanelConfig config, @Nonnull final Topic topic) {
    Renderable result = CACHED_IMAGES.get(topic);
    if (result == null) {
      result = new ScalableRenderableImage(extractImage(topic));
      CACHED_IMAGES.put(topic, result);
    }
    return result;
  }

  @Nullable
  private Image extractImage(@Nonnull final Topic topic) {
    Image result = null;
    final String encoded = topic.getAttribute(ATTR_KEY);
    if (encoded != null) {
      try {
        result = ImageIO.read(new ByteArrayInputStream(DatatypeConverter.parseBase64Binary(encoded)));
      } catch (Exception ex) {
        LOGGER.error("Can't extract image", ex);
      }
    }
    return result;
  }

  @Override
  public boolean onClick(@Nonnull MindMapPanel panel, @Nonnull final Topic topic, final int clickCount) {
    return false;
  }

  @Override
  @Nullable
  public String getToolTip(@Nonnull final MindMapPanel panel, @Nonnull final Topic topic) {
    return null;
  }

  @Override
  public boolean isClickable(@Nonnull final MindMapPanel panel, @Nonnull final Topic topic) {
    return false;
  }

  @Override
  @Nonnull
  public String getAttributeKey() {
    return ATTR_KEY;
  }

  @Override
  public int getOrder() {
    return Integer.MIN_VALUE + 100;
  }

  @Override
  public int compareTo(@Nonnull final MindMapPlugin o) {
    if (this.getOrder() == o.getOrder()) {
      return 0;
    } else if (this.getOrder() < o.getOrder()) {
      return -1;
    } else {
      return 1;
    }
  }

}