JDK8/Java8源码在线阅读

/*
 * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.nio.fs;

import java.nio.file.attribute.*;
import java.util.*;
import java.io.IOException;

/**
 * Base implementation of BasicFileAttributeView
 */

abstract class AbstractBasicFileAttributeView
    implements BasicFileAttributeView, DynamicFileAttributeView
{
    private static final String SIZE_NAME = "size";
    private static final String CREATION_TIME_NAME = "creationTime";
    private static final String LAST_ACCESS_TIME_NAME = "lastAccessTime";
    private static final String LAST_MODIFIED_TIME_NAME = "lastModifiedTime";
    private static final String FILE_KEY_NAME = "fileKey";
    private static final String IS_DIRECTORY_NAME = "isDirectory";
    private static final String IS_REGULAR_FILE_NAME = "isRegularFile";
    private static final String IS_SYMBOLIC_LINK_NAME = "isSymbolicLink";
    private static final String IS_OTHER_NAME = "isOther";

    // the names of the basic attributes
    static final Set<String> basicAttributeNames =
        Util.newSet(SIZE_NAME,
                    CREATION_TIME_NAME,
                    LAST_ACCESS_TIME_NAME,
                    LAST_MODIFIED_TIME_NAME,
                    FILE_KEY_NAME,
                    IS_DIRECTORY_NAME,
                    IS_REGULAR_FILE_NAME,
                    IS_SYMBOLIC_LINK_NAME,
                    IS_OTHER_NAME);

    protected AbstractBasicFileAttributeView() { }

    @Override
    public String name() {
        return "basic";
    }

    @Override
    public void setAttribute(String attribute, Object value)
        throws IOException
    {
        if (attribute.equals(LAST_MODIFIED_TIME_NAME)) {
            setTimes((FileTime)value, null, null);
            return;
        }
        if (attribute.equals(LAST_ACCESS_TIME_NAME)) {
            setTimes(null, (FileTime)value, null);
            return;
        }
        if (attribute.equals(CREATION_TIME_NAME)) {
            setTimes(null, null, (FileTime)value);
            return;
        }
        throw new IllegalArgumentException("'" + name() + ":" +
            attribute + "' not recognized");
    }

    /**
     * Used to build a map of attribute name/values.
     */
    static class AttributesBuilder {
        private Set<String> names = new HashSet<>();
        private Map<String,Object> map = new HashMap<>();
        private boolean copyAll;

        private AttributesBuilder(Set<String> allowed, String[] requested) {
            for (String name: requested) {
                if (name.equals("*")) {
                    copyAll = true;
                } else {
                    if (!allowed.contains(name))
                        throw new IllegalArgumentException("'" + name + "' not recognized");
                    names.add(name);
                }
            }
        }

        /**
         * Creates builder to build up a map of the matching attributes
         */
        static AttributesBuilder create(Set<String> allowed, String[] requested) {
            return new AttributesBuilder(allowed, requested);
        }

        /**
         * Returns true if the attribute should be returned in the map
         */
        boolean match(String name) {
            return copyAll || names.contains(name);
        }

        void add(String name, Object value) {
            map.put(name, value);
        }

        /**
         * Returns the map. Discard all references to the AttributesBuilder
         * after invoking this method.
         */
        Map<String,Object> unmodifiableMap() {
            return Collections.unmodifiableMap(map);
        }
    }

    /**
     * Invoked by readAttributes or sub-classes to add all matching basic
     * attributes to the builder
     */
    final void addRequestedBasicAttributes(BasicFileAttributes attrs,
                                           AttributesBuilder builder)
    {
        if (builder.match(SIZE_NAME))
            builder.add(SIZE_NAME, attrs.size());
        if (builder.match(CREATION_TIME_NAME))
            builder.add(CREATION_TIME_NAME, attrs.creationTime());
        if (builder.match(LAST_ACCESS_TIME_NAME))
            builder.add(LAST_ACCESS_TIME_NAME, attrs.lastAccessTime());
        if (builder.match(LAST_MODIFIED_TIME_NAME))
            builder.add(LAST_MODIFIED_TIME_NAME, attrs.lastModifiedTime());
        if (builder.match(FILE_KEY_NAME))
            builder.add(FILE_KEY_NAME, attrs.fileKey());
        if (builder.match(IS_DIRECTORY_NAME))
            builder.add(IS_DIRECTORY_NAME, attrs.isDirectory());

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