Encode/Decode genres using CSV (b2a23513) · Commits · e / os / android_frameworks_base

media/java/android/media/tv/TvContract.java

+78 −16

Original line number	Original line	Diff line number	Diff line
	@@ -27,6 +27,7 @@ import android.os.IBinder;
	import android.provider.BaseColumns;		import android.provider.BaseColumns;
	import android.util.ArraySet;		import android.util.ArraySet;

			import java.util.ArrayList;
	import java.util.HashMap;		import java.util.HashMap;
	import java.util.List;		import java.util.List;
	import java.util.Map;		import java.util.Map;
	@@ -1020,22 +1021,28 @@ public final class TvContract {
	*		*
	* <p>Use the same language appeared in the underlying broadcast standard, if applicable.		* <p>Use the same language appeared in the underlying broadcast standard, if applicable.
	* (For example, one can refer to the genre strings used in Genre Descriptor of ATSC A/65 or		* (For example, one can refer to the genre strings used in Genre Descriptor of ATSC A/65 or
	* Content Descriptor of ETSI EN 300 468, if appropriate.) Otherwise, leave empty.		* Content Descriptor of ETSI EN 300 468, if appropriate.) Otherwise, leave empty. Use
			* {@link Genres#encode} to create a text that can be stored in this column. Use
			* {@link Genres#decode} to get the broadcast genre strings from the text stored in the
			* column.
	*		*
	* <p>Type: TEXT		* <p>Type: TEXT
			* @see Genres#encode
			* @see Genres#decode
	*/		*/
	public static final String COLUMN_BROADCAST_GENRE = "broadcast_genre";		public static final String COLUMN_BROADCAST_GENRE = "broadcast_genre";

	/**		/**
	* The comma-separated canonical genre string of this TV program.		* The comma-separated canonical genre string of this TV program.
	*		*
	* <p>Canonical genres are defined in {@link Genres}. Use		* <p>Canonical genres are defined in {@link Genres}. Use {@link Genres#encode} to create a
	* {@link Genres#encode Genres.encode()} to create a text that can be stored in this column.		* text that can be stored in this column. Use {@link Genres#decode} to get the canonical
	* Use {@link Genres#decode Genres.decode()} to get the canonical genre strings from the		* genre strings from the text stored in the column.
	* text stored in this column.
	*		*
	* <p>Type: TEXT		* <p>Type: TEXT
	* @see Genres		* @see Genres
			* @see Genres#encode
			* @see Genres#decode
	*/		*/
	public static final String COLUMN_CANONICAL_GENRE = "canonical_genre";		public static final String COLUMN_CANONICAL_GENRE = "canonical_genre";

	@@ -1303,34 +1310,86 @@ public final class TvContract {
	CANONICAL_GENRES.add(TECH_SCIENCE);		CANONICAL_GENRES.add(TECH_SCIENCE);
	}		}

			private static final char DOUBLE_QUOTE = '"';
			private static final char COMMA = ',';

	private Genres() {}		private Genres() {}

	/**		/**
	* Encodes canonical genre strings to a text that can be put into the database.		* Encodes genre strings to a text that can be put into the database.
	*		*
	* @param genres Canonical genre strings. Use the strings defined in this class.		* @param genres Genre strings.
	* @return an encoded genre string that can be inserted into the		* @return an encoded genre string that can be inserted into the
	* {@link #COLUMN_CANONICAL_GENRE} column.		* {@link #COLUMN_BROADCAST_GENRE} or {@link #COLUMN_CANONICAL_GENRE} column.
	*/		*/
	public static String encode(String... genres) {		public static String encode(String... genres) {
	StringBuilder sb = new StringBuilder();		StringBuilder sb = new StringBuilder();
	String separator = "";		String separator = "";
	for (String genre : genres) {		for (String genre : genres) {
	sb.append(separator).append(genre);		sb.append(separator).append(encodeToCsv(genre));
	separator = ",";		separator = COMMA;
			}
			return sb.toString();
			}

			private static String encodeToCsv(String genre) {
			StringBuilder sb = new StringBuilder();
			int length = genre.length();
			for (int i = 0; i < length; ++i) {
			char c = genre.charAt(i);
			switch (c) {
			case DOUBLE_QUOTE:
			sb.append(DOUBLE_QUOTE);
			break;
			case COMMA:
			sb.append(DOUBLE_QUOTE);
			break;
			}
			sb.append(c);
	}		}
	return sb.toString();		return sb.toString();
	}		}

	/**		/**
	* Decodes the canonical genre strings from the text stored in the database.		* Decodes the genre strings from the text stored in the database.
	*		*
	* @param genres The encoded genre string retrieved from the		* @param genres The encoded genre string retrieved from the
	* {@link #COLUMN_CANONICAL_GENRE} column.		* {@link #COLUMN_BROADCAST_GENRE} or {@link #COLUMN_CANONICAL_GENRE} column.
	* @return canonical genre strings.		* @return genre strings.
	*/		*/
	public static String[] decode(String genres) {		public static String[] decode(String genres) {
	return genres.split("\\s,\\s");		StringBuilder sb = new StringBuilder();
			List<String> results = new ArrayList<>();
			int length = genres.length();
			boolean escape = false;
			for (int i = 0; i < length; ++i) {
			char c = genres.charAt(i);
			switch (c) {
			case DOUBLE_QUOTE:
			if (!escape) {
			escape = true;
			continue;
			}
			break;
			case COMMA:
			if (!escape) {
			String string = sb.toString().trim();
			if (string.length() > 0) {
			results.add(string);
			}
			sb = new StringBuilder();
			continue;
			}
			break;
			}
			sb.append(c);
			escape = false;
			}
			String string = sb.toString().trim();
			if (string.length() > 0) {
			results.add(string);
			}
			return results.toArray(new String[results.size()]);
	}		}

	/**		/**
	@@ -1441,7 +1500,10 @@ public final class TvContract {
	*		*
	* <p>Use the same language appeared in the underlying broadcast standard, if applicable.		* <p>Use the same language appeared in the underlying broadcast standard, if applicable.
	* (For example, one can refer to the genre strings used in Genre Descriptor of ATSC A/65 or		* (For example, one can refer to the genre strings used in Genre Descriptor of ATSC A/65 or
	* Content Descriptor of ETSI EN 300 468, if appropriate.) Otherwise, leave empty.		* Content Descriptor of ETSI EN 300 468, if appropriate.) Otherwise, leave empty. Use
			* {@link Genres#encode Genres.encode()} to create a text that can be stored in this column.
			* Use {@link Genres#decode Genres.decode()} to get the broadcast genre strings from the
			* text stored in the column.
	*		*
	* <p>Type: TEXT		* <p>Type: TEXT
	* @see Programs#COLUMN_BROADCAST_GENRE		* @see Programs#COLUMN_BROADCAST_GENRE
	@@ -1454,7 +1516,7 @@ public final class TvContract {
	* <p>Canonical genres are defined in {@link Programs.Genres}. Use		* <p>Canonical genres are defined in {@link Programs.Genres}. Use
	* {@link Programs.Genres#encode Genres.encode()} to create a text that can be stored in		* {@link Programs.Genres#encode Genres.encode()} to create a text that can be stored in
	* this column. Use {@link Programs.Genres#decode Genres.decode()} to get the canonical		* this column. Use {@link Programs.Genres#decode Genres.decode()} to get the canonical
	* genre strings from the text stored in this column.		* genre strings from the text stored in the column.
	*		*
	* <p>Type: TEXT		* <p>Type: TEXT
	* @see Programs#COLUMN_CANONICAL_GENRE		* @see Programs#COLUMN_CANONICAL_GENRE