001///////////////////////////////////////////////////////////////////////////////////////////////
002// checkstyle: Checks Java source code and other text files for adherence to a set of rules.
003// Copyright (C) 2001-2026 the original author or authors.
004//
005// This library is free software; you can redistribute it and/or
006// modify it under the terms of the GNU Lesser General Public
007// License as published by the Free Software Foundation; either
008// version 2.1 of the License, or (at your option) any later version.
009//
010// This library is distributed in the hope that it will be useful,
011// but WITHOUT ANY WARRANTY; without even the implied warranty of
012// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013// Lesser General Public License for more details.
014//
015// You should have received a copy of the GNU Lesser General Public
016// License along with this library; if not, write to the Free Software
017// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
018///////////////////////////////////////////////////////////////////////////////////////////////
019
020package com.puppycrawl.tools.checkstyle;
021
022import java.util.Collection;
023import java.util.HashMap;
024import java.util.HashSet;
025import java.util.Map;
026
027import com.puppycrawl.tools.checkstyle.api.Context;
028
029/**
030 * A default implementation of the Context interface.
031 */
032public final class DefaultContext implements Context {
033
034    /** Stores the context entries. */
035    private final Map<String, Object> entries = new HashMap<>();
036
037    /**
038     * Creates a new {@code DefaultContext} instance.
039     */
040    public DefaultContext() {
041        // no code by default
042    }
043
044    @Override
045    public Object get(String key) {
046        return entries.get(key);
047    }
048
049    @Override
050    public Collection<String> getAttributeNames() {
051        return new HashSet<>(entries.keySet());
052    }
053
054    /**
055     * Adds a context entry.
056     *
057     * @param key the context key
058     * @param value the value for key
059     */
060    public void add(String key, Object value) {
061        entries.put(key, value);
062    }
063
064}