bundle/src/main/java/com/adobe/acs/commons/dam/RenditionPatternPicker.java
/*
* ACS AEM Commons
*
* Copyright (C) 2013 - 2023 Adobe
*
* 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.adobe.acs.commons.dam;
import org.osgi.annotation.versioning.ProviderType;
import com.day.cq.dam.api.Asset;
import com.day.cq.dam.api.Rendition;
import com.day.cq.dam.api.RenditionPicker;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* RenditionPicker that picks Assets based on a Regex pattern that matches against
* Rendition names.
*/
@ProviderType
public class RenditionPatternPicker implements RenditionPicker {
private final Pattern pattern;
/**
* Create an Asset Rendition Picker that will pick a Rendition by matching
* the supplied Regex pattern (as String).
*
* @param pattern Regex pattern to match against Rendition names.
*/
public RenditionPatternPicker(String pattern) {
this.pattern = Pattern.compile(pattern);
}
/**
* Create an Asset Rendition Picker that will pick a Rendition by matching
* the supplied Regex pattern.
*
* @param pattern Pattern used to find the Asset rendition
*/
public RenditionPatternPicker(final Pattern pattern) {
this.pattern = pattern;
}
private Pattern getPattern() {
return this.pattern;
}
/**
* Gets the rendition which matches against the constructor's Regex pattern.
* <p>
* If no matches are made and an Original exists, returns the Original.
* <p>
* If no matches are made and an Original doesn't exist, return the first Rendition.
*
* @param asset Asset whose Renditions will be selected.
* @return The first rendition whose name matches the supplied pattern (via constructor).
*/
@Override
public final Rendition getRendition(final Asset asset) {
final List<Rendition> renditions = asset.getRenditions();
final Pattern p = getPattern();
boolean hasOriginal = asset.getOriginal() != null;
boolean hasRenditions = renditions.size() > 0;
for (final Rendition rendition : renditions) {
final Matcher m = p.matcher(rendition.getName());
if (m.find()) {
return rendition;
}
}
if (hasOriginal) {
return asset.getOriginal();
} else if (hasRenditions) {
return renditions.get(0);
} else {
return null;
}
}
}