| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.configuration2.convert; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| |
| /** |
| * <p> |
| * A specialized implementation of the {@code ListDelimiterHandler} interface |
| * which disables list splitting. |
| * </p> |
| * <p> |
| * This class does not recognize any list delimiters; passed in strings are |
| * returned unchanged. Also the {@code escape()} method is a dummy - there is no |
| * need for escaping delimiter characters as none are supported. Note that the |
| * method for escaping a list throws an {@code UnsupportedOperationException}. |
| * If list delimiters are not supported, there is no point in squashing multiple |
| * values into a single one. |
| * </p> |
| * <p> |
| * Implementation note: An instance of this class can be shared between multiple |
| * configuration objects. It is state-less and thread-safe. |
| * </p> |
| * |
| * @version $Id$ |
| * @since 2.0 |
| */ |
| public class DisabledListDelimiterHandler extends AbstractListDelimiterHandler |
| { |
| /** |
| * A default instance of this class. Because it is safe to share |
| * {@code DisabledListDelimiterHandler} objects this instance can be used |
| * whenever such an object is needed. |
| */ |
| public static final ListDelimiterHandler INSTANCE = |
| new DisabledListDelimiterHandler(); |
| |
| /** |
| * {@inheritDoc} This implementation always throws an |
| * {@code UnsupportedOperationException} exception. |
| */ |
| @Override |
| public Object escapeList(List<?> values, ValueTransformer transformer) |
| { |
| throw new UnsupportedOperationException( |
| "Escaping lists is not supported!"); |
| } |
| |
| /** |
| * {@inheritDoc} This implementation always returns a collection containing |
| * the passed in string as its single element. The string is not changed, |
| * the {@code trim} flag is ignored. (The {@code trim} flag refers to the |
| * components extracted from the string. Because no components are extracted |
| * nothing is trimmed.) |
| */ |
| @Override |
| protected Collection<String> splitString(String s, boolean trim) |
| { |
| Collection<String> result = new ArrayList<String>(1); |
| result.add(s); |
| return result; |
| } |
| |
| /** |
| * {@inheritDoc} This implementation returns the passed in string without |
| * any changes. |
| */ |
| @Override |
| protected String escapeString(String s) |
| { |
| return s; |
| } |
| } |