AbstractGenerator.java

/*
 * Copyright 2017 Red Hat, Inc. and/or its affiliates.
 *
 * 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.kie.workbench.common.stunner.svg.gen.codegen.impl;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.StringWriter;
import java.util.Map;

import freemarker.template.Configuration;
import freemarker.template.DefaultObjectWrapper;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import org.uberfire.annotations.processors.exceptions.GenerationException;

public abstract class AbstractGenerator {

    protected static ExceptionInInitializerError INITIALIZER_EXCEPTION = null;
    protected Configuration config;

    public AbstractGenerator() {
        try {
            this.config = new Configuration();
            this.config.setClassForTemplateLoading(this.getClass(),
                                                   "templates");
            this.config.setObjectWrapper(new DefaultObjectWrapper());
        } catch (NoClassDefFoundError var2) {
            if (var2.getCause() == null) {
                var2.initCause(INITIALIZER_EXCEPTION);
            }
            throw var2;
        } catch (ExceptionInInitializerError var3) {
            INITIALIZER_EXCEPTION = var3;
            throw var3;
        }
    }

    protected abstract String getTemplatePath();

    protected StringBuffer writeTemplate(final Map<String, Object> ctxt,
                                         final String path) throws GenerationException {
        //Generate code
        final StringWriter sw = new StringWriter();
        final BufferedWriter bw = new BufferedWriter(sw);
        try {
            final Template template = config.getTemplate(path + ".ftl");
            template.process(ctxt,
                             bw);
        } catch (IOException ioe) {
            throw new GenerationException(ioe);
        } catch (TemplateException te) {
            throw new GenerationException(te);
        } finally {
            try {
                bw.close();
                sw.close();
            } catch (IOException ioe) {
                throw new GenerationException(ioe);
            }
        }
        return sw.getBuffer();
    }

    protected StringBuffer writeTemplate(final Map<String, Object> ctxt) throws GenerationException {
        return writeTemplate(ctxt,
                             getTemplatePath());
    }

    protected String formatString(final String pattern,
                                  final String... values) {
        return String.format(pattern,
                             values);
    }

    protected String formatDouble(final String pattern,
                                  final double... values) {
        return SVGGeneratorFormatUtils.format(pattern,
                                              values);
    }

    protected String formatDouble(final double value) {
        return SVGGeneratorFormatUtils.format(value);
    }
}