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This is a very small fork of lombok.ast as some Android tools needed a few modifications. The normal repository for lombok.ast is here https://github.com/rzwitserloot/lombok.ast and our changes for 0.2.3 are in this pull request: https://github.com/rzwitserloot/lombok.ast/pull/8

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/*
 * Copyright (C) 2010 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.ast;

public class NullLiteral extends AbstractNode.WithParens implements Literal, Expression {
	private String rawValue = "null";
	private String errorReasonForValue;
	
	@Override
	public boolean isStatementExpression() {
		return false;
	}
	
	public String getErrorReasonForValue() {
		return errorReasonForValue;
	}
	
	public NullLiteral rawValue(String raw) {
		if (raw == null) {
			this.rawValue = null;
			this.errorReasonForValue = "Missing value";
		} else {
			this.rawValue = raw;
			String v = raw.trim();
			if (!v.equals("null")) {
				this.errorReasonForValue = "Only 'null' is a valid null literal, not: " + v;
			} else {
				this.errorReasonForValue = null;
			}
		}
		
		return this;
	}
	
	@Override
	public String rawValue() {
		return rawValue;
	}
	
	public boolean astIsValid() {
		return errorReasonForValue == null;
	}
	
	@Override
	public void accept(AstVisitor visitor) {
		if (!visitor.visitNullLiteral(this)) visitor.endVisit(this);
		visitor.afterVisitNullLiteral(this);
	}
	
	@Override
	public NullLiteral copy() {
		NullLiteral result = new NullLiteral();
		result.rawValue = rawValue;
		result.errorReasonForValue = errorReasonForValue;
		return result;
	}
}