001package org.gwtbootstrap3.client.ui.base.mixin;
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
023import java.util.List;
024
025import org.gwtbootstrap3.client.ui.form.error.DefaultErrorHandler;
026import org.gwtbootstrap3.client.ui.form.error.ErrorHandler;
027import org.gwtbootstrap3.client.ui.form.error.ErrorHandlerType;
028import org.gwtbootstrap3.client.ui.form.error.HasErrorHandler;
029
030import com.google.gwt.editor.client.EditorError;
031import com.google.gwt.editor.client.HasEditorErrors;
032import com.google.gwt.user.client.ui.Widget;
033
034/**
035 * Mixin to handle error handler support.
036 *
037 * @param <V> the type of editor value.
038 */
039public class ErrorHandlerMixin<V> implements HasEditorErrors<V>, HasErrorHandler {
040
041    private ErrorHandler errorHandler;
042
043    private ErrorHandlerType errorHandlerType = ErrorHandlerType.DEFAULT;
044
045    private Widget inputWidget = null;
046
047    /**
048     * Mixin for the {@link ErrorHandler} implementation.
049     *
050     * @param widget the widget
051     */
052    public ErrorHandlerMixin(Widget widget) {
053        inputWidget = widget;
054        errorHandler = new DefaultErrorHandler(inputWidget);
055    }
056
057    /**
058     * Clear the errors.
059     */
060    public void clearErrors() {
061        if (errorHandler != null) {
062            errorHandler.clearErrors();
063        }
064    }
065
066    /** {@inheritDoc} */
067    @Override
068    public ErrorHandler getErrorHandler() {
069        return errorHandler;
070    }
071
072    /** {@inheritDoc} */
073    @Override
074    public ErrorHandlerType getErrorHandlerType() {
075        return errorHandlerType;
076    }
077
078    /** {@inheritDoc} */
079    @Override
080    public void setErrorHandler(ErrorHandler handler) {
081        errorHandlerType = null;
082        errorHandler = handler;
083    }
084
085    /** {@inheritDoc} */
086    @Override
087    public void setErrorHandlerType(ErrorHandlerType type) {
088        if (errorHandler != null) {
089            errorHandler.cleanup();
090        }
091        errorHandlerType = type == null ? ErrorHandlerType.DEFAULT : type;
092        switch (errorHandlerType) {
093        case NONE:
094            errorHandler = null;
095            break;
096        case DEFAULT:
097            errorHandler = new DefaultErrorHandler(inputWidget);
098        }
099    }
100
101    /** {@inheritDoc} */
102    @Override
103    public void showErrors(List<EditorError> errors) {
104        if (errorHandler != null) {
105            if (errors == null || errors.isEmpty()) {
106                errorHandler.clearErrors();
107                return;
108            }
109            errorHandler.showErrors(errors);
110        }
111    }
112
113}