org.apache.wicket.util.image.ImageUtil Maven / Gradle / Ivy
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A module that creates a .jar from the classes in wicket, wicket-util and wicket-request modules in order
to create a valid OSGi bundle of the wicket framework.
/*
* 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.wicket.util.image;
import java.io.IOException;
import java.io.InputStream;
import org.apache.wicket.request.resource.PackageResourceReference;
import org.apache.wicket.util.crypt.Base64;
import org.apache.wicket.util.io.IOUtils;
import org.apache.wicket.util.resource.IResourceStream;
import org.apache.wicket.util.resource.ResourceStreamNotFoundException;
/**
* Util class to provide basic image functionality like converting image data to base64 content
*
* @author Tobias Soloschenko
* @since 6.20.0
*
*/
public class ImageUtil
{
/**
* Creates a base64 encoded image string based on the given image reference
*
* @param imageReference
* the image reference to create the base64 encoded image string of
* @param removeWhitespaces
* if whitespaces should be removed from the output
* @return the base64 encoded image string
* @throws ResourceStreamNotFoundException
* if the resource couldn't be found
* @throws IOException
* if the stream couldn't be read
*/
public static CharSequence createBase64EncodedImage(PackageResourceReference imageReference,
boolean removeWhitespaces) throws ResourceStreamNotFoundException, IOException
{
IResourceStream resourceStream = imageReference.getResource().getResourceStream();
InputStream inputStream = resourceStream.getInputStream();
try
{
byte[] bytes = IOUtils.toByteArray(inputStream);
String base64EncodedImage = Base64.encodeBase64String(bytes);
return "data:" + resourceStream.getContentType() + ";base64," +
(removeWhitespaces ? base64EncodedImage.replaceAll("\\s", "") : base64EncodedImage);
}
finally
{
IOUtils.closeQuietly(inputStream);
}
}
}