001    package org.gwtbootstrap3.client.ui.form.validator;
002    
003    /*
004     * #%L
005     * GwtBootstrap3
006     * %%
007     * Copyright (C) 2015 GwtBootstrap3
008     * %%
009     * Licensed under the Apache License, Version 2.0 (the "License");
010     * you may not use this file except in compliance with the License.
011     * You may obtain a copy of the License at
012     * 
013     *      http://www.apache.org/licenses/LICENSE-2.0
014     * 
015     * Unless required by applicable law or agreed to in writing, software
016     * distributed under the License is distributed on an "AS IS" BASIS,
017     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018     * See the License for the specific language governing permissions and
019     * limitations under the License.
020     * #L%
021     */
022    
023    import java.util.ArrayList;
024    import java.util.List;
025    
026    import org.gwtbootstrap3.client.ui.form.error.BasicEditorError;
027    
028    import com.google.gwt.core.shared.GWT;
029    import com.google.gwt.editor.client.Editor;
030    import com.google.gwt.editor.client.EditorError;
031    
032    /**
033     * Validator for blank field validation.
034     *
035     * @param <T> the generic type
036     * @author Steven Jardine
037     */
038    public class BlankValidator<T> implements Validator<T> {
039        
040        private ValidatorMessageMixin messageMixin = GWT.create(ValidatorMessageMixin.class);
041        
042        /** {@inheritDoc} */
043        @Override
044        public List<EditorError> validate(Editor<T> editor, T value) {
045            List<EditorError> result = new ArrayList<EditorError>();
046            if (value == null || "".equals(value)) {
047                result.add(new BasicEditorError(editor, value, messageMixin.lookup("org.gwtbootstrap3.validation.Blank.message")));
048            }
049            return result;
050        }
051    
052        /** {@inheritDoc} */
053        @Override
054        public int getPriority() {
055            return Priority.HIGHEST;
056        }
057    
058    }