br.com.caelum.vraptor.validator.I18nMessage Maven / Gradle / Ivy

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/***
 * Copyright (c) 2009 Caelum - www.caelum.com.br/opensource All rights reserved.
 * 
 * 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.caelum.vraptor.validator;

import static com.google.common.base.Objects.toStringHelper;

import java.text.MessageFormat;
import java.util.ResourceBundle;

import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;


/**
 * In this Message implementation, the message is i18n'ed while the category is literal.
 *
 * The i18n is lazy.
 *
 * @author Lucas Cavalcanti
 * @since 3.1.3
 */
public class I18nMessage implements Message {

	private static final long serialVersionUID = 1L;

	private final Object category;
	private final String message;
	private final Object[] parameters;
	private transient Supplier bundle;
	
	public I18nMessage(I18nParam category, String message, Object... parameters) {
		this.category = category;
		this.message = message;
		this.parameters = parameters;
	}

	public I18nMessage(String category, String message, Object... parameters) {
		this.category = category;
		this.message = message;
		this.parameters = parameters;
	}

	public void setBundle(ResourceBundle bundle) {
		this.bundle = Suppliers.ofInstance(bundle);
	}
	
	public void setLazyBundle(Supplier bundle) {
		this.bundle = bundle;
	}

	public boolean hasBundle() {
		return this.bundle != null;
	}

	public String getMessage() {
		checkBundle();

		return MessageFormat.format(bundle.get().getString(message), i18n(parameters));
	}

	private void checkBundle() {
		if (bundle == null) {
			throw new IllegalStateException("You must set the bundle before using the I18nMessage");
		}
	}

    private Object[] i18n(Object[] parameters) {
        for (int i = 0; i < parameters.length; i++) {
            if (parameters[i] instanceof I18nParam) {
                parameters[i] = ((I18nParam)parameters[i]).getKey(bundle.get());
            }
        }
        return parameters;
    }

    public String getCategory() {
    	if (category instanceof I18nParam) {
    		checkBundle();

			return ((I18nParam) category).getKey(bundle.get());
		}

		return category.toString();
	}

	@Override
	public String toString() {
		return toStringHelper(this).add("category", category).add("message", message).add("parameters", parameters).toString();
	}

}