/*
 * 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
 *
 *      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.drools.commons.jci.compilers;

import org.drools.commons.jci.problems.CompilationProblemHandler;
import org.drools.commons.jci.readers.ResourceReader;
import org.drools.commons.jci.stores.ResourceStore;


/**
 * The general compiler interface. All compilers implementing
 * this interface should read the resources from the reader
 * and store the java class files into the ResourceStore.
 * 
 * The actual compilation language does not matter. But the
 * contract is that the result of the compilation will be a
 * class file.
 * 
 * If possible the compiler should notify the optional
 * CompilationProblemHandler as soon as a problem is found.
 * 
 * @author tcurdt
 */
public interface JavaCompiler {

    /**
     * Set the the handler that gets the notification of an error
     * or warning as soon as this information is available from
     * the compiler.
     * Note: Some compilers might not support this feature.
     * 
     * @param pHandler
     */
    void setCompilationProblemHandler( final CompilationProblemHandler pHandler );

    /**
     * factory method to create the underlying default settings
     */
    JavaCompilerSettings createDefaultSettings();
    
    /**
     * uses the default compiler settings and the current classloader
     */
    CompilationResult compile( final String[] pResourcePaths, final ResourceReader pReader, final ResourceStore pStore );

    /**
     * uses the default compiler settings
     */
    CompilationResult compile( final String[] pResourcePaths, final ResourceReader pReader, final ResourceStore pStore, final ClassLoader pClassLoader );

    /**
     * Compiles the java resources "some/path/to/MyJava.java"
     * read through the ResourceReader and then stores the resulting
     * classes in the ResourceStore under "some/path/to/MyJava.class".
     * Note: As these are resource path you always have to use "/" 
     * 
     * The result of the compilation run including detailed error
     * information is returned as CompilationResult. If you need to
     * get notified already during the compilation process you can
     * register a CompilationProblemHandler.
     * Note: Not all compilers might support this notification mechanism.
     * 
     * @param pResourcePaths
     * @param pReader
     * @param pStore
     * @param pClassLoader
     * @param pSettings
     * @return always a CompilationResult
     */
    CompilationResult compile( final String[] pResourcePaths, final ResourceReader pReader, final ResourceStore pStore, final ClassLoader pClassLoader, final JavaCompilerSettings pSettings );

}