| /******************************************************************************* |
| * 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.olingo.odata2.api.exception; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.List; |
| |
| /** |
| * APPLICATION DEVELOPERS: Please use {@link ODataApplicationException} to throw custom exceptions. This class is used |
| * inside the library only. |
| * <p>A {@link MessageReference} references to the used message for an {@link ODataMessageException} and its sub |
| * classes. It supports |
| * internationalization and translation of exception messages. |
| * <br>Theses classes contain a {@link MessageReference} object which |
| * can be mapped to a related key and message text in the resource bundles. |
| * |
| */ |
| public abstract class MessageReference { |
| |
| protected final String key; |
| protected List<Object> content = null; |
| |
| private MessageReference(final String key) { |
| this(key, null); |
| } |
| |
| private MessageReference(final String key, final List<Object> content) { |
| this.key = key; |
| this.content = content; |
| } |
| |
| /** |
| * Creates a {@link MessageReference} for given <code>class</code> and <code>key</code>. |
| * This combination of <code>class</code> and <code>key</code> has to be provided |
| * by a resource bundle. |
| * @param clazz {@link ODataMessageException} for which this {@link MessageReference} should be used |
| * @param key unique key (in context of {@link ODataMessageException}) for reference |
| * to message text in resource bundle |
| * @return created {@link MessageReference} |
| */ |
| public static MessageReference create(final Class<? extends ODataException> clazz, final String key) { |
| return new SimpleMessageReference(clazz.getName() + "." + key); |
| } |
| |
| public MessageReference create() { |
| return new SingleMessageReference(key); |
| } |
| |
| /** |
| * Returns message key. |
| */ |
| public String getKey() { |
| return key; |
| } |
| |
| /** |
| * Adds given content to message reference. |
| */ |
| public MessageReference addContent(final Object... content) { |
| if (this.content == null) { |
| return new SimpleMessageReference(key, content); |
| } else { |
| final List<Object> mergedContent = new ArrayList<Object>(this.content.size() + content.length); |
| mergedContent.addAll(this.content); |
| mergedContent.addAll(Arrays.asList(content)); |
| return new SimpleMessageReference(key, mergedContent); |
| } |
| } |
| |
| /** |
| * Receives content for this {@link MessageReference}. |
| * Beware that returned list is immutable. |
| */ |
| public List<?> getContent() { |
| if (content == null) { |
| return Collections.emptyList(); |
| } else { |
| return Collections.unmodifiableList(content); |
| } |
| } |
| |
| /** |
| * Simple inner class for realization of {@link MessageReference} interface. |
| */ |
| private static class SimpleMessageReference extends MessageReference { |
| public SimpleMessageReference(final String implKey) { |
| super(implKey); |
| } |
| |
| public SimpleMessageReference(final String implKey, final List<Object> content) { |
| super(implKey, content); |
| } |
| |
| public SimpleMessageReference(final String implKey, final Object... content) { |
| super(implKey, Arrays.asList(content)); |
| } |
| } |
| |
| private static class SingleMessageReference extends MessageReference { |
| public SingleMessageReference(final String implKey) { |
| super(implKey); |
| } |
| |
| public SingleMessageReference(final String implKey, final List<Object> content) { |
| super(implKey, content); |
| } |
| |
| public SingleMessageReference(final String implKey, final Object... content) { |
| super(implKey, Arrays.asList(content)); |
| } |
| |
| @Override |
| public MessageReference addContent(final Object... content) { |
| |
| if (this.content == null) { |
| this.content = new ArrayList<Object>(); |
| } |
| |
| this.content.addAll(Arrays.asList(content)); |
| return this; |
| } |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result + ((key == null) ? 0 : key.hashCode()); |
| return result; |
| } |
| |
| /** |
| * {@link MessageReference}s are equal if their message keys have the same value. |
| * @return <code>true</code> if both instances are equal, otherwise <code>false</code>. |
| */ |
| @Override |
| public boolean equals(final Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj == null) { |
| return false; |
| } |
| if (getClass() != obj.getClass()) { |
| return false; |
| } |
| MessageReference other = (MessageReference) obj; |
| if (key == null) { |
| if (other.key != null) { |
| return false; |
| } |
| } else if (!key.equals(other.key)) { |
| return false; |
| } |
| return true; |
| } |
| |
| public MessageReference updateContent(List<?> oldContent, Object... newContent) { |
| |
| final List<Object> mergedContent = new ArrayList<Object>(); |
| if (oldContent != null && !oldContent.isEmpty()) { |
| mergedContent.addAll(oldContent); |
| } |
| mergedContent.addAll(Arrays.asList(newContent)); |
| return new SimpleMessageReference(key, mergedContent); |
| } |
| } |