/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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
 *
 *    https://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.grails.boot.internal

import java.nio.charset.Charset

import javax.tools.ToolProvider

import groovy.transform.CompileStatic
import org.codehaus.groovy.control.CompilerConfiguration

import org.springframework.util.ClassUtils

/**
 * Helper for recompiling Java code at runtime
 *
 * @author Graeme Rocher
 * @since 3.0.3
 */
@CompileStatic
class JavaCompiler {

    static boolean isAvailable() {
        ClassUtils.isPresent('javax.tools.JavaCompiler', JavaCompiler.classLoader)
    }

    static boolean recompile(CompilerConfiguration config, File... files) {
        // compile java source
        javax.tools.JavaCompiler compiler = ToolProvider.getSystemJavaCompiler()
        def sfm = compiler.getStandardFileManager(null, null, Charset.forName('UTF-8'))
        def compileTask = compiler.getTask(null, null, null, ['-d', config.targetDirectory.absolutePath], null, sfm.getJavaFileObjects(files))
        compileTask.call()
    }
}
