/*
 * Copyright 2011-2013 HTTL Team.
 *  
 * 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 httl.spi.compilers;

import httl.spi.Compiler;
import httl.spi.Logger;
import httl.util.ClassUtils;

import java.text.ParseException;

/**
 * AdaptiveCompiler. (SPI, Singleton, ThreadSafe)
 *
 * @author Liang Fei (liangfei0201 AT gmail DOT com)
 * @see httl.spi.translators.CompiledTranslator#setCompiler(Compiler)
 */
public class AdaptiveCompiler implements Compiler {

    private Compiler compiler;

    private Logger logger;

    private String codeDirectory;

    /**
     * httl.properties: loggers=httl.spi.loggers.Log4jLogger
     */
    public void setLogger(Logger logger) {
        this.logger = logger;
        if (compiler instanceof AbstractCompiler) {
            ((AbstractCompiler) compiler).setLogger(logger);
        }
    }

    /**
     * httl.properties: code.directory=/tmp
     */
    public void setCodeDirectory(String codeDirectory) {
        this.codeDirectory = codeDirectory;
        if (compiler instanceof AbstractCompiler) {
            ((AbstractCompiler) compiler).setCodeDirectory(codeDirectory);
        }
    }

    /**
     * httl.properties: lint.unchecked=true
     */
    public void setLintUnchecked(boolean unchecked) {
        if (compiler instanceof JdkCompiler) {
            ((JdkCompiler) compiler).setLintUnchecked(unchecked);
        }
    }

    /**
     * httl.properties: compile.version=1.7
     */
    public void setCompileVersion(String version) {
        if (version == null || ClassUtils.isBeforeJava6(version)) {
            JavassistCompiler javassistCompiler = new JavassistCompiler();
            javassistCompiler.setLogger(logger);
            javassistCompiler.setCodeDirectory(codeDirectory);
            compiler = javassistCompiler;
        } else {
            JdkCompiler jdkCompiler = new JdkCompiler();
            jdkCompiler.setCompileVersion(version);
            jdkCompiler.setLogger(logger);
            jdkCompiler.setCodeDirectory(codeDirectory);
            compiler = jdkCompiler;
        }
    }

    public void init() {
        if (compiler == null) {
            setCompileVersion(ClassUtils.getJavaVersion());
        }
        if (compiler instanceof JdkCompiler) {
            ((JdkCompiler) compiler).init();
        }
    }

    public Class<?> compile(String code) throws ParseException {
        return compiler.compile(code);
    }

}