com.kk_electronic.gwt.rebind.VersionGenerator.java Source code

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Here is the source code for com.kk_electronic.gwt.rebind.VersionGenerator.java

Source

/*
 * Copyright 2010 kk-electronic a/s. 
 * 
 * This file is part of KKPortal.
 *
 * KKPortal is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * KKPortal is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with KKPortal.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package com.kk_electronic.gwt.rebind;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;

import com.google.gwt.core.ext.Generator;
import com.google.gwt.core.ext.GeneratorContext;
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;

public class VersionGenerator extends Generator {

    private String packageName;
    private String className;
    private TypeOracle typeOracle;

    @Override
    public String generate(TreeLogger logger, GeneratorContext context, String typeName)
            throws UnableToCompleteException {
        try {
            typeOracle = context.getTypeOracle();
            JClassType classType = typeOracle.getType(typeName);
            packageName = classType.getPackage().getName();
            className = classType.getSimpleSourceName() + "Impl";
            generateClass(logger, context);
        } catch (NotFoundException e) {
            logger.log(TreeLogger.ERROR, "Exception during ModuleRegistry creation.", e);
            throw new UnableToCompleteException();
        }
        return packageName + "." + className;
    }

    private void generateClass(TreeLogger logger, GeneratorContext context) {
        PrintWriter printWriter = context.tryCreate(logger, packageName, className);

        if (printWriter == null) {
            return;
        }

        ClassSourceFileComposerFactory composer = new ClassSourceFileComposerFactory(packageName, className);

        composer.addImplementedInterface(Version.class.getCanonicalName());

        SourceWriter sourceWriter = composer.createSourceWriter(context, printWriter);

        writeGetSHA1(sourceWriter);
        writeGetTag(sourceWriter);

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

        context.commit(logger, printWriter);
    }

    private void writeGetSHA1(SourceWriter sourceWriter) {
        sourceWriter.println("public String getSHA1(){");
        sourceWriter.indent();
        sourceWriter.print("return \"");
        String result = executeCommand("git rev-parse HEAD");
        if (result != null) {
            sourceWriter.print(escape(result));
        }
        sourceWriter.println("\";");
        sourceWriter.outdent();
        sourceWriter.println("}");
    }

    private void writeGetTag(SourceWriter sourceWriter) {
        sourceWriter.println("public String getTag(){");
        sourceWriter.indent();
        sourceWriter.print("return \"");
        String result = executeCommand("git describe --tags --always HEAD");
        if (result != null) {
            sourceWriter.print(escape(result));
        }
        sourceWriter.println("\";");
        sourceWriter.outdent();
        sourceWriter.println("}");
    }

    private String executeCommand(String command) {
        Process child;
        try {
            child = Runtime.getRuntime().exec(command);
            BufferedReader r = new BufferedReader(new InputStreamReader(child.getInputStream()));
            return r.readLine();
        } catch (IOException e) {
            return e.toString();
        }
    }
}