org.vectomatic.dev.svg.impl.gen.SVGResourceGenerator.java Source code

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Here is the source code for org.vectomatic.dev.svg.impl.gen.SVGResourceGenerator.java

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/**********************************************
 * Copyright (C) 2010 Lukas Laag
 * This file is part of lib-gwt-svg.
 * 
 * libgwtsvg 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.
 * 
 * libgwtsvg 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 libgwtsvg.  If not, see http://www.gnu.org/licenses/
 **********************************************/
package org.vectomatic.dev.svg.impl.gen;

import java.net.URL;

import org.vectomatic.dom.svg.OMSVGSVGElement;
import org.vectomatic.dom.svg.ui.SVGResource;
import org.vectomatic.dom.svg.ui.SVGResource.Validated;
import org.vectomatic.dom.svg.utils.OMSVGParser;

import com.google.gwt.core.ext.Generator;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JMethod;
import com.google.gwt.dev.util.Util;
import com.google.gwt.resources.ext.AbstractResourceGenerator;
import com.google.gwt.resources.ext.ResourceContext;
import com.google.gwt.resources.ext.ResourceGeneratorUtil;
import com.google.gwt.user.rebind.SourceWriter;
import com.google.gwt.user.rebind.StringSourceWriter;

/**
 * Provides implementations of SVGResource.
 */
public class SVGResourceGenerator extends AbstractResourceGenerator {

    @Override
    public String createAssignment(TreeLogger logger, ResourceContext context, JMethod method)
            throws UnableToCompleteException {

        // Extract the SVG name from the @Source annotation
        URL[] resources = ResourceGeneratorUtil.findResources(logger, context, method);
        if (resources.length != 1) {
            logger.log(TreeLogger.ERROR, "Exactly one resource must be specified", null);
            throw new UnableToCompleteException();
        }
        URL resource = resources[0];

        // The SVGResource is implemented as an anonymous inner class
        // xxx = new SVGResource() {
        //   public OMSVGSVGElement getSvg() {
        //     return OMSVGParser.parse("...");
        //   }
        // };
        SourceWriter sw = new StringSourceWriter();
        sw.println("new " + SVGResource.class.getName() + "() {");
        sw.indent();

        // Convenience when examining the generated code.
        sw.println("// " + resource.toExternalForm());

        sw.println("public " + OMSVGSVGElement.class.getName() + " getSvg() {");
        sw.indent();
        String toWrite = Util.readURLAsString(resource);
        if (getValidated(method)) {
            SVGValidator.validate(toWrite, resource.toExternalForm(), logger, null);
        }
        sw.println("return " + OMSVGParser.class.getName() + ".parse(\"" + Generator.escape(toWrite) + "\");");
        sw.outdent();
        sw.println("}");

        sw.println("public String getName() {");
        sw.indent();
        sw.println("return \"" + method.getName() + "\";");
        sw.outdent();
        sw.println("}");

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

        return sw.toString();
    }

    private boolean getValidated(JMethod method) {
        Validated validated = method.getAnnotation(Validated.class);
        if (validated == null) {
            return true;
        } else {
            return validated.validated();
        }
    }

}