1 files changed, 44 insertions, 0 deletions
diff --git a/src/eclipseAgent/lombok/eclipse/agent/PatchDiagnostics.java b/src/eclipseAgent/lombok/eclipse/agent/PatchDiagnostics.java
new file mode 100644
index 00000000..82c4f522
--- /dev/null
+++ b/src/eclipseAgent/lombok/eclipse/agent/PatchDiagnostics.java
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2012 The Project Lombok Authors.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package lombok.eclipse.agent;
+
+public class PatchDiagnostics {
+	/**
+	 * 
+	 * org.eclipse.jdt.core.dom.ASTNode#setSourceRange starts off doing some sanity checks on the input arguments, and, if these fail the sanity check,
+	 * a {@code IllegalArgumentException} is thrown. However, these IAEs do not have any message and are thus pretty much useless. We do the exact same
+	 * checks, and throw the exact same exception (thus, effectively, we don't change how eclipse operates), but, we <em>do</em> provide a useful message.
+	 */
+	public static boolean setSourceRangeCheck(Object astNode, int startPosition, int length) {
+		if (startPosition >= 0 && length < 0) {
+			throw new IllegalArgumentException("startPos = " + startPosition + " and length is " + length + ".\n" +
+					"This breaks the rule that lengths are not allowed to be negative. Affected Node:\n" + astNode);
+		}
+		
+		if (startPosition < 0 && length != 0) {
+			throw new IllegalArgumentException("startPos = " + startPosition + " and length is " + length + ".\n" +
+					"This breaks the rule that length must be 0 if startPosition is negative. Affected Node:\n" + astNode);
+		}
+		
+		return false;
+	}
+}