| /* |
| * 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.compress.archivers.sevenz; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| |
| /** |
| * Base Codec class. |
| */ |
| abstract class CoderBase { |
| private final Class<?>[] acceptableOptions; |
| private static final byte[] NONE = new byte[0]; |
| |
| /** |
| * @param acceptableOptions types that can be used as options for this codec. |
| */ |
| protected CoderBase(Class<?>... acceptableOptions) { |
| this.acceptableOptions = acceptableOptions; |
| } |
| |
| /** |
| * @return whether this method can extract options from the given object. |
| */ |
| boolean canAcceptOptions(Object opts) { |
| for (Class<?> c : acceptableOptions) { |
| if (c.isInstance(opts)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * @return property-bytes to write in a Folder block |
| */ |
| byte[] getOptionsAsProperties(Object options) { |
| return NONE; |
| } |
| |
| /** |
| * @return configuration options that have been used to create the given InputStream from the given Coder |
| */ |
| Object getOptionsFromCoder(Coder coder, InputStream in) { |
| return null; |
| } |
| |
| /** |
| * @return a stream that reads from in using the configured coder and password. |
| */ |
| abstract InputStream decode(final String archiveName, |
| final InputStream in, long uncomressedLength, |
| final Coder coder, byte[] password) throws IOException; |
| |
| /** |
| * @return a stream that writes to out using the given configuration. |
| */ |
| OutputStream encode(final OutputStream out, final Object options) throws IOException { |
| throw new UnsupportedOperationException("method doesn't support writing"); |
| } |
| |
| /** |
| * If the option represents a number, return its integer |
| * value, otherwise return the given default value. |
| */ |
| protected static int numberOptionOrDefault(Object options, int defaultValue) { |
| return options instanceof Number ? ((Number) options).intValue() : defaultValue; |
| } |
| } |