/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.codegen.source;

import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.net.URI;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Map;
import javax.tools.FileObject;
import javax.tools.ForwardingJavaFileManager;
import javax.tools.JavaFileObject;
import javax.tools.SimpleJavaFileObject;
import javax.tools.StandardJavaFileManager;
import org.neo4j.codegen.ByteCodes;

class FileManager extends ForwardingJavaFileManager<StandardJavaFileManager> {
    private final Map<String /*className*/, ClassFile> classes = new HashMap<>();

    FileManager(StandardJavaFileManager fileManager) {
        super(fileManager);
    }

    @Override
    public JavaFileObject getJavaFileForOutput(
            Location location, String className, JavaFileObject.Kind kind, FileObject sibling) {
        ClassFile file = new ClassFile(className);
        classes.put(className, file);
        return file;
    }

    public Iterable<? extends ByteCodes> bytecodes() {
        return classes.values();
    }

    private static class ClassFile extends SimpleJavaFileObject implements ByteCodes {
        private final ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        private final String className;

        protected ClassFile(String className) {
            super(URI.create("classes:/" + className.replace('.', '/') + Kind.CLASS.extension), Kind.CLASS);
            this.className = className;
        }

        @Override
        public OutputStream openOutputStream() {
            return bytes;
        }

        @Override
        public String name() {
            return className;
        }

        @Override
        public ByteBuffer bytes() {
            return ByteBuffer.wrap(bytes.toByteArray());
        }
    }
}
