de.akquinet.engineering.vaadin.vaangular.angular.NgTemplate.java Source code

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Here is the source code for de.akquinet.engineering.vaadin.vaangular.angular.NgTemplate.java

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/*
 * Copyright 2015 akquinet engineering GmbH
 *  
 * 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 de.akquinet.engineering.vaadin.vaangular.angular;

import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Method;
import java.net.URISyntaxException;
import java.nio.file.Files;

import com.google.gson.Gson;
import com.vaadin.annotations.JavaScript;
import com.vaadin.ui.AbstractJavaScriptComponent;

import elemental.json.JsonObject;
import elemental.json.JsonValue;
import elemental.json.impl.JreJsonFactory;

/**
 * Use AngularJS with Vaadin - lightweight take which does not need a Widgetset
 * - but does not offer additional functionality from
 * {@link de.akquinet.engineering.vaadinjavascriptplus.AbstractJavaScriptComponentPlus}
 */
@JavaScript("NgTemplate.js")
public abstract class NgTemplate extends AbstractJavaScriptComponent {

    private static final long serialVersionUID = 1L;

    private JsonObject userState;

    public NgTemplate(String templateSource, String moduleName) {
        userState = new JreJsonFactory().createObject();

        getState().templateSource = templateSource;
        getState().moduleName = moduleName;
    }

    public NgTemplate(Package templatePackage, String moduleName)
            throws URISyntaxException, UnsupportedEncodingException, IOException {
        userState = new JreJsonFactory().createObject();

        File templateFolder = new File(NgTemplate.class.getClassLoader()
                .getResource(templatePackage.getName().replace('.', '/')).getPath());

        initFromFile(templateFolder, moduleName);
    }

    public NgTemplate(File templateFolder, String moduleName) throws IOException {
        userState = new JreJsonFactory().createObject();

        initFromFile(templateFolder, moduleName);
    }

    private void initFromFile(File templateFolder, String moduleName)
            throws UnsupportedEncodingException, IOException {
        if (templateFolder == null) {
            throw new IllegalArgumentException("param 'templateFolder' must be null!");
        }
        if (templateFolder.exists() == false) {
            throw new IllegalArgumentException("param 'templateFolder' must exist!");
        }
        if (templateFolder.isDirectory() == false) {
            throw new IllegalArgumentException("param 'templateFolder' must represent a directory!");
        }
        String templateSource = new String(
                Files.readAllBytes(new File(templateFolder, templateFolder.getName() + ".html").toPath()), "UTF-8");

        getState().templateSource = templateSource;
        getState().moduleName = moduleName;
    }

    @Override
    public NgTemplateState getState() {
        return (NgTemplateState) super.getState();
    }

    public void addService(final String name, final Object callback) {
        Class<?> type = callback.getClass();
        for (final Method method : type.getMethods()) {
            if (method.isAnnotationPresent(ServiceMethod.class)) {
                final String methodName = method.getName();
                addFunction(name + "_" + methodName, new MethodInvoker(callback, method));
            }
        }
    }

    public void setUserState(String key, String value) {
        this.userState.put(key, value);
        pushUserStateChange();
    }

    public void setUserState(String key, Object value) {

        String json = new Gson().toJson(value);
        this.userState.put(key, (JsonValue) new JreJsonFactory().parse(json));
        pushUserStateChange();
    }

    private void pushUserStateChange() {
        getState().changeType = "userState";
        getState().userState = this.userState.toJson();
    }

}