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Dash UrlTemplate parses template using ArrayLists

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Hugo Houillon 2023-09-28 19:24:20 +02:00 committed by microkatz
parent 022444e751
commit 81e2472034
1 changed files with 22 additions and 31 deletions
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53
libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/manifest/UrlTemplate.java
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@ -16,9 +16,8 @@
package androidx.media3.exoplayer.dash.manifest;
import androidx.media3.common.util.UnstableApi;
import java.util.ArrayList;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* A template from which URLs can be built.
@ -41,7 +40,7 @@ public final class UrlTemplate {
private static final int TIME_ID = 4;
private final String[] urlPieces;
private final int[] identifiers;
private final Integer[] identifiers;
private final String[] identifierFormatTags;
private final int identifierCount;
@ -53,29 +52,20 @@ public final class UrlTemplate {
* @throws IllegalArgumentException If the template string is malformed.
*/
public static UrlTemplate compile(String template) {
// We can have more than once each identifier in the template so we need
// to count the total number of identifiers present in the template
int identifiersCount = 0;
String[] identifiersNames = { REPRESENTATION, NUMBER, BANDWIDTH, TIME };
for(String identifierName : identifiersNames){
Pattern pattern = Pattern.compile("(\\$" + identifierName + "\\$|" + ESCAPED_DOLLAR + "\\$" + identifierName + "\\$" + ESCAPED_DOLLAR +")");
Matcher matcher = pattern.matcher(template);
while(matcher.find())
identifiersCount++;
}
String[] urlPieces = new String[identifiersCount+1];
int[] identifiers = new int[identifiersCount];
String[] identifierFormatTags = new String[identifiersCount];
ArrayList<String> urlPieces = new ArrayList<>();
ArrayList<Integer> identifiers = new ArrayList<>();
ArrayList<String> identifierFormatTags = new ArrayList<>();
int identifierCount = parseTemplate(template, urlPieces, identifiers, identifierFormatTags);
return new UrlTemplate(urlPieces, identifiers, identifierFormatTags, identifierCount);
}
/** Internal constructor. Use {@link #compile(String)} to build instances of this class. */
private UrlTemplate(
String[] urlPieces, int[] identifiers, String[] identifierFormatTags, int identifierCount) {
this.urlPieces = urlPieces;
this.identifiers = identifiers;
this.identifierFormatTags = identifierFormatTags;
ArrayList<String> urlPieces, ArrayList<Integer> identifiers, ArrayList<String> identifierFormatTags, int identifierCount) {
this.urlPieces = urlPieces.toArray(new String[0]);
this.identifiers = identifiers.toArray(new Integer[0]);
this.identifierFormatTags = identifierFormatTags.toArray(new String[0]);
this.identifierCount = identifierCount;
}
@ -124,26 +114,27 @@ public final class UrlTemplate {
* @throws IllegalArgumentException If the template string is malformed.
*/
private static int parseTemplate(
String template, String[] urlPieces, int[] identifiers, String[] identifierFormatTags) {
urlPieces[0] = "";
String template, ArrayList<String> urlPieces, ArrayList<Integer> identifiers, ArrayList<String> identifierFormatTags) {
urlPieces.add("");
int templateIndex = 0;
int identifierCount = 0;
while (templateIndex < template.length()) {
int dollarIndex = template.indexOf("$", templateIndex);
if (dollarIndex == -1) {
urlPieces[identifierCount] += template.substring(templateIndex);
urlPieces.set(identifierCount, urlPieces.get(identifierCount) + template.substring(templateIndex));
templateIndex = template.length();
} else if (dollarIndex != templateIndex) {
urlPieces[identifierCount] += template.substring(templateIndex, dollarIndex);
urlPieces.set(identifierCount, urlPieces.get(identifierCount) + template.substring(templateIndex, dollarIndex));
templateIndex = dollarIndex;
} else if (template.startsWith(ESCAPED_DOLLAR, templateIndex)) {
urlPieces[identifierCount] += "$";
urlPieces.set(identifierCount, urlPieces.get(identifierCount) + "$");
templateIndex += 2;
} else {
identifierFormatTags.add(null);
int secondIndex = template.indexOf("$", templateIndex + 1);
String identifier = template.substring(templateIndex + 1, secondIndex);
if (identifier.equals(REPRESENTATION)) {
identifiers[identifierCount] = REPRESENTATION_ID;
identifiers.add(REPRESENTATION_ID);
} else {
int formatTagIndex = identifier.indexOf("%0");
String formatTag = DEFAULT_FORMAT_TAG;
@ -159,21 +150,21 @@ public final class UrlTemplate {
}
switch (identifier) {
case NUMBER:
identifiers[identifierCount] = NUMBER_ID;
identifiers.add(NUMBER_ID);
break;
case BANDWIDTH:
identifiers[identifierCount] = BANDWIDTH_ID;
identifiers.add(BANDWIDTH_ID);
break;
case TIME:
identifiers[identifierCount] = TIME_ID;
identifiers.add(TIME_ID);
break;
default:
throw new IllegalArgumentException("Invalid template: " + template);
}
identifierFormatTags[identifierCount] = formatTag;
identifierFormatTags.set(identifierCount, formatTag);
}
identifierCount++;
urlPieces[identifierCount] = "";
urlPieces.add("");
templateIndex = secondIndex + 1;
}
}