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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 MessageState implements ParserState {

	public void start(MessageInterpolationTokenCollector tokenCollector) {
		throw new IllegalStateException( "The parsing of the message descriptor cannot start in this state." );
	}

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

	public void handleNonMetaCharacter(char character, MessageInterpolationTokenCollector tokenCollector)
			throws MessageDescriptorFormatException {
		tokenCollector.appendToToken( character );
		tokenCollector.next();
	}

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

		tokenCollector.appendToToken( character );
		if ( tokenCollector.getInterpolationType().equals( InterpolationTermType.PARAMETER ) ) {
			tokenCollector.makeParameterToken();
		}
		tokenCollector.transitionState( new InterpolationTermState() );
		tokenCollector.next();
	}


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


	public void handleEscapeCharacter(char character, MessageInterpolationTokenCollector tokenCollector)
			throws MessageDescriptorFormatException {
		tokenCollector.appendToToken( character );

		tokenCollector.transitionState( new EscapedState( this ) );
		tokenCollector.next();
	}

	public void handleELDesignator(char character, MessageInterpolationTokenCollector tokenCollector)
			throws MessageDescriptorFormatException {
		if ( tokenCollector.getInterpolationType().equals( InterpolationTermType.PARAMETER ) ) {
			handleNonMetaCharacter( character, tokenCollector );
		}
		else {
			tokenCollector.transitionState( new ELState() );
			tokenCollector.next();
		}
	}
}