com.googlecode.mgwt.useragent.rebind.UserAgentGenerator.java Source code

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Here is the source code for com.googlecode.mgwt.useragent.rebind.UserAgentGenerator.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.useragent.rebind;

import java.io.PrintWriter;
import java.util.Locale;

import com.google.gwt.core.ext.BadPropertyValueException;
import com.google.gwt.core.ext.Generator;
import com.google.gwt.core.ext.GeneratorContext;
import com.google.gwt.core.ext.PropertyOracle;
import com.google.gwt.core.ext.SelectionProperty;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.core.ext.typeinfo.NotFoundException;
import com.google.gwt.core.ext.typeinfo.TypeOracle;
import com.google.gwt.user.rebind.ClassSourceFileComposerFactory;
import com.google.gwt.user.rebind.SourceWriter;

/**
 * Generator for {@link com.google.gwt.useragent.client.UserAgent}.
 */
public class UserAgentGenerator extends Generator {
    static final String PROPERTY_USER_AGENT = "user.agent";

    @Override
    public String generate(TreeLogger logger, GeneratorContext context, String typeName)
            throws UnableToCompleteException {
        TypeOracle typeOracle = context.getTypeOracle();

        JClassType userType;
        try {
            userType = typeOracle.getType(typeName);
        } catch (NotFoundException e) {
            logger.log(TreeLogger.ERROR, "Unable to find metadata for type: " + typeName, e);
            throw new UnableToCompleteException();
        }
        String packageName = userType.getPackage().getName();
        String className = userType.getName();
        className = className.replace('.', '_');

        if (userType.isInterface() == null) {
            logger.log(TreeLogger.ERROR, userType.getQualifiedSourceName() + " is not an interface", null);
            throw new UnableToCompleteException();
        }

        PropertyOracle propertyOracle = context.getPropertyOracle();

        String userAgentValue;
        SelectionProperty selectionProperty;
        try {
            selectionProperty = propertyOracle.getSelectionProperty(logger, PROPERTY_USER_AGENT);
            userAgentValue = selectionProperty.getCurrentValue();
        } catch (BadPropertyValueException e) {
            logger.log(TreeLogger.ERROR, "Unable to find value for '" + PROPERTY_USER_AGENT + "'", e);
            throw new UnableToCompleteException();
        }

        String userAgentValueInitialCap = userAgentValue.substring(0, 1).toUpperCase(Locale.ENGLISH)
                + userAgentValue.substring(1);
        className = className + "Impl" + userAgentValueInitialCap;

        ClassSourceFileComposerFactory composerFactory = new ClassSourceFileComposerFactory(packageName, className);
        composerFactory.addImplementedInterface(userType.getQualifiedSourceName());

        PrintWriter pw = context.tryCreate(logger, packageName, className);
        if (pw != null) {
            SourceWriter sw = composerFactory.createSourceWriter(context, pw);

            sw.println();
            sw.println("public native String getRuntimeValue() /*-{");
            sw.indent();
            UserAgentPropertyGenerator.writeUserAgentPropertyJavaScript(sw, selectionProperty.getPossibleValues(),
                    null);
            sw.outdent();
            sw.println("}-*/;");
            sw.println();

            sw.println();
            sw.println("public String getCompileTimeValue() {");
            sw.indent();
            sw.println("return \"" + userAgentValue.trim() + "\";");
            sw.outdent();
            sw.println("}");

            sw.commit(logger);
        }
        return composerFactory.getCreatedClassName();
    }
}