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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.sling.thumbnails.internal.transformers;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.sling.api.resource.ValueMap;
import org.apache.sling.thumbnails.extension.TransformationHandler;
import org.apache.sling.thumbnails.BadRequestException;
import org.apache.sling.thumbnails.TransformationHandlerConfig;
import org.osgi.service.component.annotations.Component;
import net.coobird.thumbnailator.Thumbnails;
import net.coobird.thumbnailator.Thumbnails.Builder;
/**
* A transformer for resizing an image
*/
@Component(service = TransformationHandler.class, immediate = true)
public class ScaleHandler implements TransformationHandler {
public static final String RESOURCE_TYPE = "sling/thumbnails/transformers/scale";
public static final String PN_BOTH = "both";
@Override
public String getResourceType() {
return RESOURCE_TYPE;
}
@Override
public void handle(InputStream inputStream, OutputStream outputStream, TransformationHandlerConfig config)
throws IOException {
ValueMap properties = config.getProperties();
double both = properties.get(PN_BOTH, -1.0);
double width = properties.get(ResizeHandler.PN_WIDTH, -1.0);
double height = properties.get(ResizeHandler.PN_HEIGHT, -1.0);
try {
Builder<? extends InputStream> builder = Thumbnails.of(inputStream);
if (both >= 0) {
builder.scale(both);
} else if (width >= 0 && height >= 0) {
builder.scale(width, height);
} else {
throw new BadRequestException("Could not scale thumbnail, invalid parameters: \n%s", properties);
}
builder.toOutputStream(outputStream);
} catch (IllegalArgumentException e) {
throw new BadRequestException("Unable to resize due to invalid configuration: \n%s", config.getProperties(),
e);
}
}
}