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/*
 *
 * Copyright 2002-2004 The Ant-Contrib project
 *
 *  Licensed 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.codehaus.mojo.natives.parser;

/**
 * An base class for objects that represent the state of an AbstractParser.
 *
 * @author CurtArnold
 * @see AbstractParser
 */
public abstract class AbstractParserState
{
    private AbstractParser parser;

    protected AbstractParserState( AbstractParser parser )
    {
        if ( parser == null )
        {
            throw new NullPointerException( "parser" );
        }
        this.parser = parser;
    }

    /**
     * Consume a character
     *
     * @return new state, may be null to ignore the rest of the line
     */
    public abstract AbstractParserState consume( char ch );

    protected AbstractParser getParser()
    {
        return parser;
    }
}