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/*******************************************************************************
* Copyright (c) 2006 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.Expression;
import org.eclipse.jdt.core.dom.StringLiteral;
/**
* Convert an expression to/from a string (e.g. "text").
*/
public final class StringExpressionConverter extends AbstractExpressionConverter {
private static ExpressionConverter INSTANCE;
/**
* Return the singleton.
*/
public static ExpressionConverter instance() {
if (INSTANCE == null) {
INSTANCE = new StringExpressionConverter();
}
return INSTANCE;
}
/**
* Ensure non-instantiability.
*/
private StringExpressionConverter() {
super();
}
@Override
protected Expression convert_(Object o, AST ast) {
StringLiteral stringLiteral = ast.newStringLiteral();
stringLiteral.setLiteralValue((String) o);
return stringLiteral;
}
@Override
protected Object convert_(Expression expression) {
return (expression.getNodeType() == ASTNode.STRING_LITERAL) ?
((StringLiteral) expression).getLiteralValue()
:
null;
}
}
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