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/*******************************************************************************
 * Copyright 2012 Anteros Tecnologia
 *  
 * 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 br.com.anteros.bean.validation.messageinterpolation;



public class ELState implements ParserState {
	
	public void start(MessageInterpolationTokenCollector tokenCollector) {
		throw new IllegalStateException( "Parsing of message descriptor cannot start in this state" );
	}


	public void terminate(MessageInterpolationTokenCollector tokenCollector) throws MessageDescriptorFormatException {
		tokenCollector.appendToToken( MessageInterpolationTokenCollector.EL_DESIGNATOR );
		tokenCollector.terminateToken();
	}


	public void handleNonMetaCharacter(char character, MessageInterpolationTokenCollector tokenCollector)
			throws MessageDescriptorFormatException {
		tokenCollector.appendToToken( MessageInterpolationTokenCollector.EL_DESIGNATOR );
		tokenCollector.appendToToken( character );
		tokenCollector.terminateToken();
		tokenCollector.transitionState( new BeginState() );
		tokenCollector.next();
	}


	public void handleBeginTerm(char character, MessageInterpolationTokenCollector tokenCollector) throws MessageDescriptorFormatException {
		tokenCollector.terminateToken();

		tokenCollector.appendToToken( MessageInterpolationTokenCollector.EL_DESIGNATOR );
		tokenCollector.appendToToken( character );
		tokenCollector.makeELToken();
		tokenCollector.transitionState( new InterpolationTermState() );
		tokenCollector.next();
	}

	public void handleEndTerm(char character, MessageInterpolationTokenCollector tokenCollector) throws MessageDescriptorFormatException {
		throw new MessageDescriptorFormatException("The message descriptor "
				+ tokenCollector.getOriginalMessageDescriptor() + " contains an unbalanced meta character " + character
				+ " parameter.");
	}


	public void handleEscapeCharacter(char character, MessageInterpolationTokenCollector tokenCollector)
			throws MessageDescriptorFormatException {
		tokenCollector.transitionState( new EscapedState( this ) );
		tokenCollector.next();
	}


	public void handleELDesignator(char character, MessageInterpolationTokenCollector tokenCollector)
			throws MessageDescriptorFormatException {
		handleNonMetaCharacter( character, tokenCollector );
	}
}