org.cruxframework.crux.plugin.bootstrap.rebind.font.FontResourceGenerator.java Source code

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Here is the source code for org.cruxframework.crux.plugin.bootstrap.rebind.font.FontResourceGenerator.java

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/*
 * Copyright 2011 cruxframework.org.
 * 
 * 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 org.cruxframework.crux.plugin.bootstrap.rebind.font;

import java.net.URL;

import org.cruxframework.crux.plugin.bootstrap.client.font.FontName;

import com.google.gwt.core.ext.BadPropertyValueException;
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.dom.client.StyleInjector;
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;

/**
 * @author wesley.diniz
 *
 */
public class FontResourceGenerator extends AbstractResourceGenerator {
    /**
     *  Create a custom font-resource to inject at a stylesheet
     *  @param logger
     *  @param context
     *  @param method
     */
    @Override
    public String createAssignment(TreeLogger logger, ResourceContext context, JMethod method)
            throws UnableToCompleteException {
        SourceWriter sw = new StringSourceWriter();

        sw.print("new ");
        sw.print(method.getReturnType().getQualifiedSourceName());
        sw.println("() {");
        sw.indent();

        writeGetFontName(method, sw);
        writeGetName(method, sw);
        writeEnsureInjected(sw);
        writeGetText(logger, context, method, sw);

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

    private void writeGetFontName(JMethod method, SourceWriter sw) {
        sw.println("public String getFontName() {");
        sw.indent();

        sw.print("return \"");
        sw.print(getFontName(method));
        sw.println("\";");
        sw.outdent();
        sw.println("}");
    }

    protected void writeEnsureInjected(SourceWriter sw) {
        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() + ".inject(getText());");
        sw.indentln("return true;");
        sw.println("}");
        sw.println("return false;");
        sw.outdent();
        sw.println("}");
    }

    private void writeGetName(JMethod method, SourceWriter sw) {
        sw.println("public String getName() {");
        sw.indent();
        sw.println("return \"" + method.getName() + "\";");
        sw.outdent();
        sw.println("}");
    }

    private void writeGetText(TreeLogger logger, ResourceContext context, JMethod method, SourceWriter sw)
            throws UnableToCompleteException {
        sw.println("public String getText() {");
        sw.indent();

        URL[] urls = ResourceGeneratorUtil.findResources(logger, context, method);

        sw.print("return \"");
        sw.print("@font-face{");

        sw.print("font-family:'");
        sw.print(getFontName(method));
        sw.print("';");

        sw.print("font-style:normal;");
        sw.print("font-weight:400;");

        try {
            String agent = context.getGeneratorContext().getPropertyOracle()
                    .getSelectionProperty(logger, "user.agent").getCurrentValue();
            if (agent.equals("ie6") || agent.equals("ie8"))
                writeSrcIE(logger, context, method, sw, urls);
            else
                writeSrc(logger, context, method, sw, urls);
        } catch (BadPropertyValueException e) {
            throw new UnableToCompleteException();
        }
        sw.print("}");

        sw.println("\";");

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

    }

    private void writeSrc(TreeLogger logger, ResourceContext context, JMethod method, SourceWriter sw, URL[] urls)
            throws UnableToCompleteException {
        for (URL url : urls) {
            String lower = url.getPath().toLowerCase();
            if (lower.endsWith(".ttf") || lower.endsWith(".otf")) {
                String outputUrlExpression = context.deploy(url, "application/x-font-ttf", false);

                sw.print("src:url('\" + ");
                sw.print(outputUrlExpression);
                sw.print(" + \"') format('truetype');");
            }
        }
    }

    private void writeSrcIE(TreeLogger logger, ResourceContext context, JMethod method, SourceWriter sw, URL[] urls)
            throws UnableToCompleteException {
        for (URL url : urls) {
            if (url.getPath().toLowerCase().endsWith(".eot")) {
                String outputUrlExpression = context.deploy(url, "application/vnd.ms-fontobject", false);

                sw.print("src:url('\" + ");
                sw.print(outputUrlExpression);
                sw.print(" + \"');");
            }
        }
    }

    private String getFontName(JMethod method) {
        FontName name = method.getAnnotation(FontName.class);
        return name == null ? method.getName() : name.value();
    }
}