From 2c9c848ae275705ce315b6061cd06640834c9d9d Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Mon, 13 Mar 2017 18:16:25 -0400
Subject: lazy-parse the version and startTime

---
 dslog/PdplogReader.java | 45 +++++++++++++++++++++++++++++++++++++--------
 1 file changed, 37 insertions(+), 8 deletions(-)

(limited to 'dslog/PdplogReader.java')

diff --git a/dslog/PdplogReader.java b/dslog/PdplogReader.java
index 3df9c2b..2618101 100644
--- a/dslog/PdplogReader.java
+++ b/dslog/PdplogReader.java
@@ -1,25 +1,54 @@
 package dslog;
 
+import java.io.BufferedInputStream;
 import java.io.Closeable;
 import java.io.IOException;
 import java.io.InputStream;
-import java.lang.UnsupportedOperationException;
 
 class PdplogReader implements Closeable {
-	private final InputStream reader;
 
-	public final int version;
+	/*============================================================*\
+	|| Primitive IO                                               ||
+	\*============================================================*/
 
+	private final InputStream reader;
 	public PdplogReader(InputStream reader) throws IOException {
+		if (!reader.markSupported()) {
+			reader = new BufferedInputStream(reader);
+		}
 		this.reader = reader;
-		this.version = Read.i32(reader);
-		switch (this.version) {
+	}
+
+	private boolean atEOF() throws IOException {
+		reader.mark(2);
+		boolean eof = (reader.read() < 0);
+		reader.reset();
+		return eof;
+	}
+
+
+	/*============================================================* \
+	|| Parsing                                                    ||
+	\*============================================================*/
+
+	private int m_version;
+	private boolean m_haveVersion = false;
+	public int version() throws IOException {
+		if (!m_haveVersion) {
+			m_version = Read.i32(reader);
+			m_haveVersion = true;
+		}
+		return m_version;
+	}
+
+	public void read() throws IOException {
+		switch (version()) {
 		case 0: // ????-????
-			throw new UnsupportedOperationException("TODO: PDPLOG v0 support");
+			throw new UnsupportedVersionException("PDPLOG (TODO)", 0);
 		case 1: // ????-2015
-			throw new UnsupportedOperationException("TODO: PDPLOG v1 support");
+			throw new UnsupportedVersionException("PDPLOG (TODO)", 1);
 		default:
-			throw new UnsupportedOperationException("Unrecognized PDPLOG version: "+this.version);
+			throw new UnsupportedVersionException("PDPLOG", version(), 1);
 		}
 	}
 
-- 
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