    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one
    003 * or more contributor license agreements.  See the NOTICE file
    004 * distributed with this work for additional information
    005 * regarding copyright ownership.  The ASF licenses this file
    006 * to you under the Apache License, Version 2.0 (the
    007 * "License"); you may not use this file except in compliance
    008 * with the License.  You may obtain a copy of the License at
    009 *
    010 *   https://www.apache.org/licenses/LICENSE-2.0
    011 *
    012 * Unless required by applicable law or agreed to in writing,
    013 * software distributed under the License is distributed on an
    014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    015 * KIND, either express or implied.  See the License for the
    016 * specific language governing permissions and limitations
    017 * under the License.
    018 */
    019package org.apache.commons.compress.harmony.pack200;
    020
    021import java.beans.PropertyChangeListener;
    022import java.beans.PropertyChangeSupport;
    023import java.io.IOException;
    024import java.util.SortedMap;
    025import java.util.TreeMap;
    026
    027/**
    028 * Provides generic JavaBeans support for the Pack/UnpackAdapters
    029 */
    030public abstract class Pack200Adapter {
    031
    032    protected static final int DEFAULT_BUFFER_SIZE = 8192;
    033
    034    private final PropertyChangeSupport support = new PropertyChangeSupport(this);
    035
    036    private final SortedMap<String, String> properties = new TreeMap<>();
    037
    038    public void addPropertyChangeListener(final PropertyChangeListener listener) {
    039        support.addPropertyChangeListener(listener);
    040    }
    041
    042    /**
    043     * Completion between 0..1.
    044     *
    045     * @param value Completion between 0..1.
    046     * @throws IOException if the value cannot be parsed
    047     */
    048    protected void completed(final double value) throws IOException {
    049        firePropertyChange("pack.progress", null, String.valueOf((int) (100 * value))); //$NON-NLS-1$
    050    }
    051
    052    /**
    053     * Reports a property update to listeners
    054     *
    055     * @param propertyName name of property being updated
    056     * @param oldValue old property value
    057     * @param newValue new property value
    058     * @throws IOException if the values cannot be parsed
    059     */
    060    protected void firePropertyChange(final String propertyName, final Object oldValue, final Object newValue) throws IOException {
    061        support.firePropertyChange(propertyName, oldValue, newValue);
    062    }
    063
    064    public SortedMap<String, String> properties() {
    065        return properties;
    066    }
    067
    068    public void removePropertyChangeListener(final PropertyChangeListener listener) {
    069        support.removePropertyChangeListener(listener);
    070    }
    071}