/*
 * Copyright 2010 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 org.gradle.groovy.scripts;

import groovy.lang.Script;

import java.io.File;
import java.util.*;

public class CachingScriptCompilationHandler implements ScriptCompilationHandler {
    private final ScriptCompilationHandler handler;
    private final Map<Collection<Object>, Class<?>> cachedClasses = new HashMap<Collection<Object>, Class<?>>();

    public CachingScriptCompilationHandler(ScriptCompilationHandler handler) {
        this.handler = handler;
    }

    public void compileToDir(ScriptSource source, ClassLoader classLoader, File scriptCacheDir, Transformer transformer,
                             Class<? extends Script> scriptBaseClass) {
        handler.compileToDir(source, classLoader, scriptCacheDir, transformer, scriptBaseClass);
    }

    public <T extends Script> Class<? extends T> loadFromDir(ScriptSource source, ClassLoader classLoader,
                                                             File scriptCacheDir, Class<T> scriptBaseClass) {
        List<Object> key = Arrays.asList(source.getClassName(), classLoader, scriptCacheDir);
        Class<?> c = cachedClasses.get(key);
        if (c == null) {
            c = handler.loadFromDir(source, classLoader, scriptCacheDir, scriptBaseClass);
            cachedClasses.put(key, c);
        }
        return c.asSubclass(scriptBaseClass);
    }
}
