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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.syncope.client.console.commons;
20  
21  import java.io.Serializable;
22  import java.util.Optional;
23  import org.apache.commons.lang3.StringUtils;
24  import org.apache.syncope.client.console.init.ClassPathScanImplementationLookup;
25  import org.apache.syncope.client.ui.commons.markup.html.form.preview.BinaryPreviewer;
26  import org.apache.syncope.client.ui.commons.markup.html.form.preview.DefaultPreviewer;
27  import org.slf4j.Logger;
28  import org.slf4j.LoggerFactory;
29  import org.springframework.util.ClassUtils;
30  
31  public class PreviewUtils implements Serializable {
32  
33      private static final long serialVersionUID = 2765845550328631887L;
34  
35      protected static final Logger LOG = LoggerFactory.getLogger(PreviewUtils.class);
36  
37      protected final ClassPathScanImplementationLookup lookup;
38  
39      public PreviewUtils(final ClassPathScanImplementationLookup lookup) {
40          this.lookup = lookup;
41      }
42  
43      public BinaryPreviewer getPreviewer(final String mimeType) {
44          if (StringUtils.isBlank(mimeType)) {
45              return new DefaultPreviewer(mimeType);
46          }
47  
48          return Optional.ofNullable(lookup.getPreviewerClass(mimeType)).map(clazz -> {
49              try {
50                  return ClassUtils.getConstructorIfAvailable(clazz, String.class).
51                          newInstance(new Object[] { mimeType });
52              } catch (Exception e) {
53                  LOG.error("While getting BinaryPreviewer for {}", mimeType, e);
54  
55                  return new DefaultPreviewer(mimeType);
56              }
57          }).orElseGet(() -> new DefaultPreviewer(mimeType));
58      }
59  }