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/*******************************************************************************
* Copyright (c) 2007, 2008 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.utility.jdt;
import org.eclipse.jdt.core.dom.AST;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.ArrayInitializer;
import org.eclipse.jdt.core.dom.Expression;
import org.eclipse.jpt.core.utility.jdt.ExpressionConverter;
/**
* Convert an array initializer or single expression to/from an array of
* strings (e.g. {"text0", "text1"}).
* E is the type of the expressions to be found either standalone or
* as elements in the array initializer.
*/
public class AnnotationStringArrayExpressionConverter
extends AbstractExpressionConverter<String[]>
{
private final ExpressionConverter<String> elementConverter;
private final StringArrayExpressionConverter arrayConverter;
/**
* The default behavior is to remove the array initializer if it is empty.
*/
public AnnotationStringArrayExpressionConverter(ExpressionConverter<String> elementConverter) {
this(elementConverter, true);
}
public AnnotationStringArrayExpressionConverter(ExpressionConverter<String> elementConverter, boolean removeArrayInitializerWhenEmpty) {
super();
this.elementConverter = elementConverter;
this.arrayConverter = new StringArrayExpressionConverter(elementConverter, removeArrayInitializerWhenEmpty);
}
/**
* if we only have a single string in the array return the single expression,
* without braces, instead of an array initializer
*/
@Override
protected Expression convertObject(String[] strings, AST ast) {
return (strings.length == 1) ?
this.elementConverter.convert(strings[0], ast)
:
this.arrayConverter.convertObject(strings, ast);
}
@Override
protected String[] convertNull() {
return this.arrayConverter.convertNull();
}
/**
* check for a single expression with no surrounding braces, implying a
* single-entry array
*/
@Override
protected String[] convertExpression(Expression expression) {
return (expression.getNodeType() == ASTNode.ARRAY_INITIALIZER) ?
this.arrayConverter.convertArrayInitializer((ArrayInitializer) expression)
:
new String[] {this.elementConverter.convert(expression)};
}
// ********** factory methods **********
/**
* Build an expression converter for an annotation element of type String[].
* @Foo(bar={"text0", "text1"})
* or
* @Foo(bar="text0")
*/
public static AnnotationStringArrayExpressionConverter forStrings() {
return new AnnotationStringArrayExpressionConverter(StringExpressionConverter.instance());
}
/**
* Build an expression converter for an annotation element of type <enum>[].
* @Foo(bar={BAZ, BAT})
* or
* @Foo(bar=BAZ)
*/
public static AnnotationStringArrayExpressionConverter forNames() {
return new AnnotationStringArrayExpressionConverter(NameStringExpressionConverter.instance());
}
}
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