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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;

/**
 * This parser state checks consumed characters against a specific character.
 *
 * @author Curt Arnold
 */
public final class LetterState
    extends AbstractParserState
{
    /**
     * Next state if a match is found.
     */
    private final AbstractParserState nextState;

    /**
     * Next state if not match is found.
     */
    private final AbstractParserState noMatchState;

    /**
     * Character to match.
     */
    private final char thisLetter;

    /**
     * Constructor.
     *
     * @param parser parser
     * @param matchLetter letter to match
     * @param nextStateArg next state if a match on the letter
     * @param noMatchStateArg state if no match on letter
     */
    public LetterState( final AbstractParser parser, final char matchLetter, final AbstractParserState nextStateArg,
            final AbstractParserState noMatchStateArg )
    {
        super( parser );
        this.thisLetter = matchLetter;
        this.nextState = nextStateArg;
        this.noMatchState = noMatchStateArg;
    }

    /**
     * Consumes a character and returns the next state for the parser.
     *
     * @param ch next character
     * @return the configured nextState if ch is the expected character or the configure noMatchState otherwise.
     */
    public AbstractParserState consume( final char ch )
    {
        if ( ch == thisLetter )
        {
            return nextState;
        }
        if ( ch == '\n' )
        {
            getParser().getNewLineState();
        }
        return noMatchState;
    }
}