| /******************************************************************************* |
| * 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 java.util.List; |
| 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 to/from an array of strings (e.g. {"text0", "text1"}). |
| * |
| * Do NOT use this class for converting array initializers in annotation elements. |
| * Java5 has a bit of syntactic sugar that allows a single-element array |
| * initializer to not have curly braces. This converter will return null if it encounters |
| * anything other than an array initializer. |
| * |
| * Invalid entries in the array initializer will result in null elements in the |
| * resulting string array. This allows clients to manipulate elements at |
| * the appropriate index. |
| */ |
| public class StringArrayExpressionConverter |
| extends AbstractExpressionConverter<String[]> |
| { |
| private final ExpressionConverter<String> elementConverter; |
| private final boolean removeArrayInitializerWhenEmpty; |
| |
| private static final String[] EMPTY_STRING_ARRAY = new String[0]; |
| |
| |
| /** |
| * The default behavior is to remove the array initializer if it is empty. |
| */ |
| public StringArrayExpressionConverter(ExpressionConverter<String> elementConverter) { |
| this(elementConverter, true); |
| } |
| |
| public StringArrayExpressionConverter(ExpressionConverter<String> elementConverter, boolean removeArrayInitializerWhenEmpty) { |
| super(); |
| this.elementConverter = elementConverter; |
| this.removeArrayInitializerWhenEmpty = removeArrayInitializerWhenEmpty; |
| } |
| |
| @Override |
| /* |
| * this method is 'public' so it can be called by |
| * AnnotationStringArrayExpressionConverter |
| */ |
| public ArrayInitializer convertObject(String[] strings, AST ast) { |
| if ((strings.length == 0) && this.removeArrayInitializerWhenEmpty) { |
| return null; |
| } |
| ArrayInitializer arrayInitializer = ast.newArrayInitializer(); |
| List<Expression> expressions = this.expressions(arrayInitializer); |
| for (String string : strings) { |
| expressions.add(this.elementConverter.convert(string, ast)); |
| } |
| return arrayInitializer; |
| } |
| |
| @SuppressWarnings("unchecked") |
| private List<Expression> expressions(ArrayInitializer arrayInitializer) { |
| return arrayInitializer.expressions(); |
| } |
| |
| /* |
| * this method is 'public' so it can be called by |
| * AnnotationStringArrayExpressionConverter |
| */ |
| @Override |
| public String[] convertNull() { |
| return EMPTY_STRING_ARRAY; |
| } |
| |
| @Override |
| protected String[] convertExpression(Expression expression) { |
| return (expression.getNodeType() == ASTNode.ARRAY_INITIALIZER) ? |
| this.convertArrayInitializer((ArrayInitializer) expression) |
| : |
| EMPTY_STRING_ARRAY; |
| } |
| |
| /* |
| * this method is 'public' so it can be called by |
| * AnnotationStringArrayExpressionConverter |
| */ |
| public String[] convertArrayInitializer(ArrayInitializer arrayInitializer) { |
| List<Expression> expressions = this.downcastExpressions(arrayInitializer); |
| int len = expressions.size(); |
| String[] strings = new String[len]; |
| for (int i = len; i-- > 0; ) { |
| strings[i] = this.elementConverter.convert(expressions.get(i)); |
| } |
| return strings; |
| } |
| |
| @SuppressWarnings("unchecked") |
| private List<Expression> downcastExpressions(ArrayInitializer arrayInitializer) { |
| return arrayInitializer.expressions(); |
| } |
| |
| } |