com.allen_sauer.gwt.log.rebind.RemoteLoggerConfigGenerator.java Source code

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Here is the source code for com.allen_sauer.gwt.log.rebind.RemoteLoggerConfigGenerator.java

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/*
 * Copyright 2009 Fred Sauer
 *
 * 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.allen_sauer.gwt.log.rebind;

import com.google.gwt.core.ext.BadPropertyValueException;
import com.google.gwt.core.ext.ConfigurationProperty;
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.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;

import java.io.PrintWriter;
import java.util.List;

/**
 * Generator for {@link com.allen_sauer.gwt.log.client.RemoteLoggerConfig}.
 */
public class RemoteLoggerConfigGenerator extends Generator {
    // CHECKSTYLE_JAVADOC_OFF
    private static final String PROPERTY_LOG_URL = "log_url";

    @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, "OOPS", e);
            throw new UnableToCompleteException();
        }
        String packageName = userType.getPackage().getName();
        String className = userType.getName();

        JClassType remoteService = typeOracle.findType(typeName);
        if (remoteService == null) {
            logger.log(TreeLogger.ERROR, "Unable to find metadata for type '" + typeName + "'", null);
            throw new UnableToCompleteException();
        }

        if (remoteService.isInterface() == null) {
            logger.log(TreeLogger.ERROR, remoteService.getQualifiedSourceName() + " is not an interface", null);
            throw new UnableToCompleteException();
        }
        ClassSourceFileComposerFactory composerFactory = new ClassSourceFileComposerFactory(packageName,
                className + "Impl");
        composerFactory.addImplementedInterface(remoteService.getQualifiedSourceName());

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

            PropertyOracle propertyOracle = context.getPropertyOracle();
            String logUrl;
            try {
                ConfigurationProperty logPatternProperty = propertyOracle
                        .getConfigurationProperty(PROPERTY_LOG_URL);
                List<String> values = logPatternProperty.getValues();
                logUrl = values.get(0);
            } catch (BadPropertyValueException e) {
                logger.log(TreeLogger.ERROR, "Unable to find value for '" + PROPERTY_LOG_URL + "'", e);
                throw new UnableToCompleteException();
            }

            sw.println();
            sw.println("public String serviceEntryPointUrl() {");
            sw.indent();

            if (logUrl == null) {
                sw.println("return null;");
            } else {
                sw.println("return \"" + logUrl.trim() + "\";");
            }

            sw.outdent();
            sw.println("}");

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