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/*******************************************************************************
* Copyright (c) 2006, 2007 Oracle. 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.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.core.internal.jdtutility;
import org.eclipse.jdt.core.dom.AST;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.NumberLiteral;
/**
* Convert a number literal to/from a string representation of a number
* (e.g. "48").
*/
public final class NumberStringExpressionConverter
extends AbstractExpressionConverter<NumberLiteral, String>
{
private static ExpressionConverter<NumberLiteral, String> INSTANCE;
/**
* Return the singleton.
*/
public static ExpressionConverter<NumberLiteral, String> instance() {
if (INSTANCE == null) {
INSTANCE = new NumberStringExpressionConverter();
}
return INSTANCE;
}
/**
* Ensure single instance.
*/
private NumberStringExpressionConverter() {
super();
}
@Override
protected NumberLiteral convert_(String string, AST ast) {
return ast.newNumberLiteral(string);
}
@Override
protected String convert_(NumberLiteral numberLiteral) {
return (numberLiteral.getNodeType() == ASTNode.NUMBER_LITERAL) ?
numberLiteral.getToken()
:
null;
}
}
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