com.googlecode.mgwt.ui.server.util.MGWTCssResourceGenerator.java Source code

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Here is the source code for com.googlecode.mgwt.ui.server.util.MGWTCssResourceGenerator.java

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/*
 * Copyright 2014 Daniel Kurka
 *
 * 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 com.googlecode.mgwt.ui.server.util;

import com.google.gwt.core.ext.BadPropertyValueException;
import com.google.gwt.core.ext.ConfigurationProperty;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.dom.client.StyleInjector;
import com.google.gwt.resources.ext.ResourceContext;
import com.google.gwt.resources.rg.CssResourceGenerator;
import com.google.gwt.user.rebind.SourceWriter;

public class MGWTCssResourceGenerator extends CssResourceGenerator {

    private boolean injectAtStart;

    @Override
    protected void writeEnsureInjected(SourceWriter sw) {
        if (!injectAtStart) {
            super.writeEnsureInjected(sw);
        } else {
            sw.println("private boolean injected;");
            sw.println("public boolean ensureInjected() {");
            sw.indent();
            sw.println("if (!injected) {");
            sw.indentln("injected = true;");
            sw.indentln(StyleInjector.class.getName() + ".injectAtStart(getText());");
            sw.indentln("return true;");
            sw.println("}");
            sw.println("return false;");
            sw.outdent();
            sw.println("}");
        }
    }

    @Override
    public void init(TreeLogger logger, ResourceContext context) throws UnableToCompleteException {
        super.init(logger, context);

        try {
            // get module base url config value
            ConfigurationProperty property = context.getGeneratorContext().getPropertyOracle()
                    .getConfigurationProperty("mgwt.css.inject");
            injectAtStart = "start".equals(property.getValues().get(0));
        } catch (BadPropertyValueException e) {
            // if we can`t find it die
            logger.log(TreeLogger.ERROR,
                    "Configuration property mgwt.css.inject is not defined. Is UI.gwt.xml inherited?");
            throw new UnableToCompleteException();
        }
    }
}