io.wcm.handler.mediasource.dam.impl.CropRenditionHandler.java Source code

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Here is the source code for io.wcm.handler.mediasource.dam.impl.CropRenditionHandler.java

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/*
 * #%L
 * wcm.io
 * %%
 * Copyright (C) 2014 wcm.io
 * %%
 * 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.
 * #L%
 */
package io.wcm.handler.mediasource.dam.impl;

import io.wcm.handler.media.CropDimension;
import io.wcm.wcm.commons.contenttype.FileExtension;

import java.util.Iterator;
import java.util.Set;
import java.util.TreeSet;
import java.util.regex.Pattern;

import org.apache.commons.lang3.StringUtils;

import com.day.cq.dam.api.Asset;

/**
 * Handles resolving DAM renditions and resizing for media handler.
 */
class CropRenditionHandler extends DefaultRenditionHandler {

    private static final Pattern DEFAULT_WEB_RENDITION_PATTERN = Pattern.compile("^cq5dam\\.web\\..*$");
    private final CropDimension cropDimension;
    private final String assetFileExtension;

    /**
     * @param asset DAM asset
     * @param cropDimension Crop dimension
     */
    public CropRenditionHandler(Asset asset, CropDimension cropDimension) {
        super(asset);
        this.cropDimension = cropDimension;
        assetFileExtension = StringUtils.substringAfterLast(asset.getName(), ".");
    }

    /**
     * Searches for the biggest web enabled rendition and, if exists, adds a {@link VirtualCropRenditionMetadata} to the
     * list
     * @param candidates
     * @return {@link Set} of {@link RenditionMetadata}
     */
    @Override
    protected Set<RenditionMetadata> postProcessCandidates(Set<RenditionMetadata> candidates) {
        TreeSet<RenditionMetadata> processedCandidates = new TreeSet<>(candidates);
        Iterator<RenditionMetadata> descendingIterator = processedCandidates.descendingIterator();
        VirtualCropRenditionMetadata cropRendition = null;
        while (descendingIterator.hasNext()) {
            RenditionMetadata rendition = descendingIterator.next();
            if (DEFAULT_WEB_RENDITION_PATTERN.matcher(rendition.getRendition().getName()).matches()) {
                RenditionMetadata sourceRendition = new RenditionMetadata(rendition.getRendition());
                boolean isImage = FileExtension.isImage(assetFileExtension);
                if (isImage && sourceRendition.getWidth() >= cropDimension.getRight()
                        && sourceRendition.getHeight() >= cropDimension.getBottom()) {
                    // found biggest virtual rendition for cropped image
                    cropRendition = new VirtualCropRenditionMetadata(sourceRendition.getRendition(),
                            cropDimension.getWidth(), cropDimension.getHeight(), cropDimension);
                    break;
                }
            }
        }
        if (cropRendition != null) {
            processedCandidates.add(cropRendition);
        }
        return processedCandidates;
    }

}