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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;

import java.util.Locale;

import br.com.anteros.validation.api.MessageInterpolator;

/**
 * Helper class dealing with the interpolation of a single message parameter or expression extracted from a message
 * descriptor.
 *
 * @author Hardy Ferentschik
 */
public class InterpolationTerm {
	/**
	 * Meta character to designate an EL expression.
	 */
	private static final String EL_DESIGNATION_CHARACTER = "$";

	/**
	 * The actual expression (parameter or EL expression).
	 */
	private final String expression;

	/**
	 * The type of the expression.
	 */
	private final InterpolationTermType type;

	/**
	 * The resolver for the expression.
	 */
	private final TermResolver resolver;

	public InterpolationTerm(String expression, Locale locale) {
		this.expression = expression;
		if ( isElExpression(expression) ) {
			this.type = InterpolationTermType.EL;
			this.resolver = new ElTermResolver(locale);
		}
		else {
			this.type = InterpolationTermType.PARAMETER;
			this.resolver = new ParameterTermResolver();
		}
	}

	public static boolean isElExpression(String expression) {
		return expression.startsWith( EL_DESIGNATION_CHARACTER );
	}

	public String interpolate(MessageInterpolator.Context context) {
		return resolver.interpolate( context, expression );
	}

	@Override
	public String toString() {
		final StringBuilder sb = new StringBuilder();
		sb.append( "InterpolationExpression" );
		sb.append( "{expression='" ).append( expression ).append( '\'' );
		sb.append( ", type=" ).append( type );
		sb.append( '}' );
		return sb.toString();
	}
}