diff options
| -rw-r--r-- | cmds/uinput/src/com/android/commands/uinput/EvemuParser.java | 33 |
1 files changed, 22 insertions, 11 deletions
diff --git a/cmds/uinput/src/com/android/commands/uinput/EvemuParser.java b/cmds/uinput/src/com/android/commands/uinput/EvemuParser.java index da991624e685..d3e62d5351f0 100644 --- a/cmds/uinput/src/com/android/commands/uinput/EvemuParser.java +++ b/cmds/uinput/src/com/android/commands/uinput/EvemuParser.java @@ -48,12 +48,17 @@ public class EvemuParser implements EventParser { private static class CommentAwareReader { private final LineNumberReader mReader; - private String mPreviousLine; - private String mNextLine; + /** The previous line of the file, or {@code null} if we're at the start of the file. */ + private @Nullable String mPreviousLine; + /** + * The next line of the file to be returned from {@link #peekLine()}, or {@code null} if we + * haven't peeked since the last {@link #advance()} or are at the end of the file. + */ + private @Nullable String mNextLine; + private boolean mAtEndOfFile = false; - CommentAwareReader(LineNumberReader in) throws IOException { + CommentAwareReader(LineNumberReader in) { mReader = in; - mNextLine = findNextLine(); } private @Nullable String findNextLine() throws IOException { @@ -61,7 +66,7 @@ public class EvemuParser implements EventParser { while (line != null && line.length() == 0) { String unstrippedLine = mReader.readLine(); if (unstrippedLine == null) { - // End of file. + mAtEndOfFile = true; return null; } line = stripComments(unstrippedLine); @@ -85,22 +90,28 @@ public class EvemuParser implements EventParser { * {@code null} if the end of the file is reached. However, it does not advance to the * next line of the file. */ - public @Nullable String peekLine() { + public @Nullable String peekLine() throws IOException { + if (mNextLine == null && !mAtEndOfFile) { + mNextLine = findNextLine(); + } return mNextLine; } /** Moves to the next line of the file. */ - public void advance() throws IOException { + public void advance() { mPreviousLine = mNextLine; - mNextLine = findNextLine(); + mNextLine = null; } public boolean isAtEndOfFile() { - return mNextLine == null; + return mAtEndOfFile; } - /** Returns the previous line, for error messages. */ - public String getPreviousLine() { + /** + * Returns the previous line, for error messages. Will be {@code null} if we're at the start + * of the file. + */ + public @Nullable String getPreviousLine() { return mPreviousLine; } |