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Merge pull request #1565 from k9mail/boundary_generator_optimization

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Optimize BoundaryGenerator
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cketti 2016-12-12 00:42:37 +01:00 committed by GitHub
commit 8def88afcb
1 changed files with 15 additions and 6 deletions
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21
k9mail-library/src/main/java/com/fsck/k9/mail/BoundaryGenerator.java
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@ -1,7 +1,6 @@
package com.fsck.k9.mail;
import java.util.Locale;
import java.util.Random;
import android.support.annotation.VisibleForTesting;
@ -9,6 +8,14 @@ import android.support.annotation.VisibleForTesting;
public class BoundaryGenerator {
private static final BoundaryGenerator INSTANCE = new BoundaryGenerator(new Random());
private static final int BOUNDARY_CHARACTER_COUNT = 30;
private static final char[] BASE36_MAP = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
'U', 'V', 'W', 'X', 'Y', 'Z'
};
private final Random random;
@ -24,11 +31,13 @@ public class BoundaryGenerator {
}
public String generateBoundary() {
StringBuilder sb = new StringBuilder();
sb.append("----");
for (int i = 0; i < 30; i++) {
sb.append(Integer.toString(random.nextInt(36), 36));
StringBuilder builder = new StringBuilder(4 + BOUNDARY_CHARACTER_COUNT);
builder.append("----");
for (int i = 0; i < BOUNDARY_CHARACTER_COUNT; i++) {
builder.append(BASE36_MAP[random.nextInt(36)]);
}
return sb.toString().toUpperCase(Locale.US);
return builder.toString();
}
}