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Create specific class to manage a map of URI prefixes
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Julian Mendez
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Jun 10, 2017
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91 changes: 91 additions & 0 deletions
91
tabula-core/src/main/java/de/tudresden/inf/lat/tabula/table/PrefixMap.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| package de.tudresden.inf.lat.tabula.table; | ||
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| import java.net.URI; | ||
| import java.util.Optional; | ||
| import java.util.stream.Stream; | ||
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| /** | ||
| * This models a map of URI prefixes. | ||
| */ | ||
| public interface PrefixMap { | ||
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| /** | ||
| * Start of the prefix. | ||
| */ | ||
| String PREFIX_AMPERSAND = "&"; | ||
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| /** | ||
| * End of the prefix. | ||
| */ | ||
| String PREFIX_SEMICOLON = ";"; | ||
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| /** | ||
| * Returns the expansion for the given prefix. | ||
| * | ||
| * @param key | ||
| * the prefix | ||
| * @return expansion for the given prefix | ||
| */ | ||
| Optional<URI> get(URI key); | ||
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| /** | ||
| * Assigns a prefix to an expansion. | ||
| * | ||
| * @param key | ||
| * prefix | ||
| * @param value | ||
| * expansion | ||
| * @return an optional containing the previous value of the given key, or | ||
| * empty if there was no value for that key | ||
| */ | ||
| Optional<URI> put(URI key, URI value); | ||
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| /** | ||
| * Returns a URI with the prefix, i.e. a shortened URI. | ||
| * | ||
| * @param uri | ||
| * URI | ||
| * @return a URI with the prefix | ||
| */ | ||
| URI getWithPrefix(URI uri); | ||
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| /** | ||
| * Returns a URI without the prefix, i.e. with the prefix already expanded. | ||
| * | ||
| * @param uri | ||
| * URI | ||
| * @return a URI without the prefix | ||
| */ | ||
| URI getWithoutPrefix(URI uri); | ||
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| /** | ||
| * Returns an optional with the prefix for the given URI, or empty if there | ||
| * is none. | ||
| * | ||
| * @param uri | ||
| * URI | ||
| * @return an optional with the prefix for the given URI, or empty if there | ||
| * is none | ||
| */ | ||
| Optional<URI> getPrefixFor(URI uri); | ||
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| /** | ||
| * Returns a stream to iterate on the keys. | ||
| * | ||
| * @return a stream to iterate on the keys | ||
| */ | ||
| Stream<URI> getKeysAsStream(); | ||
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| /** | ||
| * Clears the content. | ||
| */ | ||
| void clear(); | ||
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| /** | ||
| * Returns the size of this prefix map. | ||
| * | ||
| * @return the size of this prefix map | ||
| */ | ||
| int size(); | ||
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| } |
99 changes: 99 additions & 0 deletions
99
tabula-core/src/main/java/de/tudresden/inf/lat/tabula/table/PrefixMapImpl.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| package de.tudresden.inf.lat.tabula.table; | ||
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| import java.net.URI; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.Optional; | ||
| import java.util.TreeMap; | ||
| import java.util.stream.Stream; | ||
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| import de.tudresden.inf.lat.tabula.common.OptMap; | ||
| import de.tudresden.inf.lat.tabula.common.OptMapImpl; | ||
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| /** | ||
| * An object of this class is a map of URI prefixes. This implementation | ||
| * iterates on the keys keeping the order in which they were added for the first | ||
| * time. | ||
| * | ||
| */ | ||
| public class PrefixMapImpl implements PrefixMap { | ||
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| private OptMap<URI, URI> prefixMap = new OptMapImpl<URI, URI>(new TreeMap<>()); | ||
| private List<URI> keyList = new ArrayList<URI>(); | ||
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| public Optional<URI> get(URI key) { | ||
| return this.prefixMap.get(key); | ||
| } | ||
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| public Optional<URI> put(URI key, URI value) { | ||
| if (!this.prefixMap.containsKey(key)) { | ||
| this.keyList.add(key); | ||
| } | ||
| return this.prefixMap.put(key, value); | ||
| } | ||
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| @Override | ||
| public Optional<URI> getPrefixFor(URI uri) { | ||
| String uriStr = uri.toASCIIString(); | ||
| Optional<URI> key = prefixMap.keySet().stream() | ||
| .filter((URI e) -> uriStr.startsWith(prefixMap.get(e).get().toASCIIString())).findFirst(); | ||
| if (key.isPresent()) { | ||
| return Optional.of(key.get()); | ||
| } else { | ||
| return Optional.empty(); | ||
| } | ||
| } | ||
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| @Override | ||
| public URI getWithoutPrefix(URI uri) { | ||
| URI ret = uri; | ||
| String uriStr = uri.toASCIIString(); | ||
| if (uriStr.startsWith(PREFIX_AMPERSAND)) { | ||
| int pos = uriStr.indexOf(PREFIX_SEMICOLON, PREFIX_AMPERSAND.length()); | ||
| if (pos != -1) { | ||
| URI prefix = URI.create(uriStr.substring(PREFIX_AMPERSAND.length(), pos)); | ||
| Optional<URI> optExpansion = this.prefixMap.get(prefix); | ||
| if (optExpansion.isPresent()) { | ||
| ret = URI.create( | ||
| optExpansion.get().toASCIIString() + uriStr.substring(pos + PREFIX_SEMICOLON.length())); | ||
| } | ||
| } | ||
| } | ||
| return ret; | ||
| } | ||
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| @Override | ||
| public URI getWithPrefix(URI uri) { | ||
| URI ret = uri; | ||
| Optional<URI> optPrefix = getPrefixFor(uri); | ||
| if (optPrefix.isPresent()) { | ||
| String uriStr = uri.toASCIIString(); | ||
| URI key = optPrefix.get(); | ||
| String keyStr = key.toASCIIString(); | ||
| Optional<URI> optExpansion = get(key); | ||
| String expansionStr = optExpansion.get().toASCIIString(); | ||
| if (keyStr.isEmpty()) { | ||
| ret = URI.create(uriStr.substring(expansionStr.length())); | ||
| } else { | ||
| ret = URI.create(PREFIX_AMPERSAND + keyStr + PREFIX_SEMICOLON + uriStr.substring(expansionStr.length())); | ||
| } | ||
| } | ||
| return ret; | ||
| } | ||
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| @Override | ||
| public Stream<URI> getKeysAsStream() { | ||
| return this.keyList.stream(); | ||
| } | ||
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| @Override | ||
| public void clear() { | ||
| this.prefixMap.clear(); | ||
| this.keyList.clear(); | ||
| } | ||
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| public int size() { | ||
| return this.prefixMap.size(); | ||
| } | ||
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| } |
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