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Apache Commons Imaging (previously Sanselan) is a pure-Java image library.

There is a newer version: 1.0.0-alpha4

/*
 * 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.commons.imaging.common;

import java.io.IOException;
import java.util.Map;

import org.apache.commons.imaging.ImageReadException;
import org.apache.commons.imaging.common.bytesource.ByteSource;

/**
 * Implementations support embedding the Extensible Metadata Platform
 * tags.
 *
 * @see https://en.wikipedia.org/wiki/Extensible_Metadata_Platform
 * @since 1.0
 */
public interface XmpEmbeddable {

    /**
     * Get a string containing XML-formatted text conforming to the Extensible
     * Metadata  Platform (EXP) standard for representing information about
     * image content.  Not all image formats support EXP information and
     * even for those that do, there is no guarantee that such information
     * will be present in an image.
     *
     * @param byteSource A valid reference to a ByteSource.
     * @param params     Optional instructions for special-handling or
     *                   interpretation of the input data.
     * @return If XMP metadata is present, a valid string;
     *         if it is not present, a null.
     * @throws ImageReadException In the event that the specified content
     *                            does not conform to the format of the specific
     *                            parser implementation.
     * @throws IOException        In the event of unsuccessful read or access operation.
     */
    String getXmpXml(ByteSource byteSource, Map params)
            throws ImageReadException, IOException;

}