Add a specialized token factory

[yangtools.git] / yang / yang-parser-rfc7950 / src / main / java / org / opendaylight / yangtools / yang / parser / rfc7950 / antlr / Token12144.java

diff --git a/yang/yang-parser-rfc7950/src/main/java/org/opendaylight/yangtools/yang/parser/rfc7950/antlr/Token12144.java b/yang/yang-parser-rfc7950/src/main/java/org/opendaylight/yangtools/yang/parser/rfc7950/antlr/Token12144.java
new file mode 100644 (file)
index 0000000..29dc881
--- /dev/null
+++ b/yang/yang-parser-rfc7950/src/main/java/org/opendaylight/yangtools/yang/parser/rfc7950/antlr/Token12144.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2020 PANTHEON.tech, s.r.o. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.yangtools.yang.parser.rfc7950.antlr;
+
+import org.antlr.v4.runtime.CharStream;
+import org.antlr.v4.runtime.TokenSource;
+import org.antlr.v4.runtime.misc.Pair;
+
+/**
+ * Intermediate general token implementation. This cuts {@code channel}, {@code text} fields completely, as we typically
+ * we do not use them. {@code type} and {@code charPositionInLine} are cut down to a single byte, and {@code line} is
+ * cut down to an unsigned short. {@code startIndex} and {@code stopIndex} are kept at full four-byte range, this making
+ * this implementation useful beyond 64K-char file mark.
+ *
+ * <p>
+ * This class ends up costing 32/48/32/32 bytes instead of 48/64/48/48 bytes, a saving of 33% in the same scenarios as
+ * {@link Token12122} across all possible file sizes.
+ */
+final class Token12144 extends AbstractSourceToken {
+    private final byte type;
+    private final short line;
+    private final byte charPositionInLine;
+
+    private final int startIndex;
+    private final int stopIndex;
+
+    Token12144(final Pair<TokenSource, CharStream> source, final int type, final int line, final int charPositionInLine,
+            final int startIndex, final int stopIndex) {
+        super(source);
+        this.type = (byte) type;
+        this.line = (short) line;
+        this.charPositionInLine = (byte) charPositionInLine;
+        this.startIndex = startIndex;
+        this.stopIndex = stopIndex;
+    }
+
+    @Override
+    public int getType() {
+        return type;
+    }
+
+    @Override
+    public int getLine() {
+        return Short.toUnsignedInt(line);
+    }
+
+    @Override
+    public int getCharPositionInLine() {
+        return Byte.toUnsignedInt(charPositionInLine);
+    }
+
+    @Override
+    public int getStartIndex() {
+        return startIndex;
+    }
+
+    @Override
+    public int getStopIndex() {
+        return stopIndex;
+    }
+}