/*
* #%L
* =====================================================
* _____ _ ____ _ _ _ _
* |_ _|_ __ _ _ ___| |_ / __ \| | | | ___ | | | |
* | | | '__| | | / __| __|/ / _` | |_| |/ __|| |_| |
* | | | | | |_| \__ \ |_| | (_| | _ |\__ \| _ |
* |_| |_| \__,_|___/\__|\ \__,_|_| |_||___/|_| |_|
* \____/
*
* =====================================================
*
* Hochschule Hannover
* (University of Applied Sciences and Arts, Hannover)
* Faculty IV, Dept. of Computer Science
* Ricklinger Stadtweg 118, 30459 Hannover, Germany
*
* Email: trust@f4-i.fh-hannover.de
* Website: http://trust.f4.hs-hannover.de/
*
* This file is part of visitmeta-visualization, version 0.6.0,
* implemented by the Trust@HsH research group at the Hochschule Hannover.
* %%
* Copyright (C) 2012 - 2016 Trust@HsH
* %%
* 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 de.hshannover.f4.trust.visitmeta.util;
import de.hshannover.f4.trust.visitmeta.IfmapStrings;
import de.hshannover.f4.trust.visitmeta.interfaces.Metadata;
/**
* Utility class that helps extracting information of {@link Metadata} objects.
*
* @author Bastian Hellmann
*
*/
public class MetadataHelper {
/**
* Private constructor, as the the class only contains static methods.
*/
private MetadataHelper() {
}
/**
* Tries to extract the IF-MAP publisher id of a {@link Metadata} object.
*
* @param metadata
* a {@link Metadata} object
* @return the IF-MAP publisher id for the given {@link Metadata} object, if
* it is found in the properties; otherwise, a empty string is
* returned
*/
public static String extractPublisherId(Metadata metadata) {
return extractProperty(metadata, "[@"
+ IfmapStrings.PUBLISHER_ID_ATTR + "]");
}
/**
* Tries to extract the IF-MAP publisher timestamp of a {@link Metadata} object.
*
* @param metadata
* a {@link Metadata} object
* @return the IF-MAP publisher timestamp for the given {@link Metadata} object, if
* it is found in the properties; otherwise, a empty string is
* returned
*/
public static String extractTimestamp(Metadata metadata) {
return extractProperty(metadata, "[@"
+ IfmapStrings.IFMAP_TIMESTAMP_ATTR + "]");
}
/**
* Tries to extract a property id of a {@link Metadata} object.
*
* @param metadata
* a {@link Metadata} object
* @param propertyKey
* key of the property
*
* @return the value of the property for the given {@link Metadata} object, if
* it is found in the properties; otherwise, a empty string is
* returned
*/
public static String extractProperty(Metadata metadata, String propertyKey) {
for (String property : metadata.getProperties()) {
if (property.contains(propertyKey)) {
return metadata.valueFor(property);
}
}
return "";
}
}