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20 package org.settings4j.contentresolver;
21
22 import org.apache.commons.lang3.Validate;
23 import org.settings4j.ContentResolver;
24 import org.settings4j.Filter;
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32 public class FilteredContentResolverWrapper implements ContentResolver {
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34 private final ContentResolver targetContentResolver;
35 private final Filter filter;
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42 public FilteredContentResolverWrapper(final ContentResolver targetContentResolver, final Filter filter) {
43 super();
44 Validate.notNull(targetContentResolver, "FilteredContentResolverWrapper needs a ContentResolver Object");
45 Validate.notNull(filter, "FilteredContentResolverWrapper needs a Filter Object");
46 this.targetContentResolver = targetContentResolver;
47 this.filter = filter;
48 }
49
50 @Override
51 public void addContentResolver(final ContentResolver contentResolver) {
52 this.targetContentResolver.addContentResolver(contentResolver);
53 }
54
55 @Override
56 public byte[] getContent(final String key) {
57 if (!this.filter.isValid(key)) {
58 return null;
59 }
60 return this.targetContentResolver.getContent(key);
61 }
62 }