ratpack.groovy.template.internal.TextTemplateCompiler.java Source code

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Here is the source code for ratpack.groovy.template.internal.TextTemplateCompiler.java

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/*
 * Copyright 2013 the original author or authors.
 *
 * 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 ratpack.groovy.template.internal;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.util.CharsetUtil;
import org.codehaus.groovy.control.CompilationFailedException;
import ratpack.groovy.script.internal.ScriptEngine;

import java.io.IOException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class TextTemplateCompiler {

    private final Logger logger = LoggerFactory.getLogger(getClass());
    private final ByteBufAllocator byteBufAllocator;

    private boolean verbose;
    private final TextTemplateParser parser = new TextTemplateParser();
    private final ScriptEngine<DefaultTextTemplateScript> scriptEngine;

    public TextTemplateCompiler(ScriptEngine<DefaultTextTemplateScript> scriptEngine,
            ByteBufAllocator byteBufAllocator) {
        this(scriptEngine, false, byteBufAllocator);
    }

    public TextTemplateCompiler(ScriptEngine<DefaultTextTemplateScript> scriptEngine, boolean verbose,
            ByteBufAllocator byteBufAllocator) {
        this.scriptEngine = scriptEngine;
        this.verbose = verbose;
        this.byteBufAllocator = byteBufAllocator;
    }

    public CompiledTextTemplate compile(ByteBuf templateSource, String name)
            throws CompilationFailedException, IOException {
        ByteBuf scriptSource = byteBufAllocator.buffer(templateSource.capacity());
        parser.parse(templateSource, scriptSource);

        String scriptSourceString = scriptSource.toString(CharsetUtil.UTF_8);
        scriptSource.release();

        if (verbose && logger.isInfoEnabled()) {
            logger.info("\n-- script source --\n" + scriptSourceString + "\n-- script end --\n");
        }

        try {
            Class<DefaultTextTemplateScript> scriptClass = scriptEngine.compile(name, scriptSourceString);
            return new CompiledTextTemplate(name, scriptClass);
        } catch (Exception e) {
            throw new InvalidTemplateException(name, "compilation failure", e);
        }
    }

}