/*

 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.tools.sjavac.comp;

import java.io.*;

import java.net.URI;

import javax.lang.model.element.Modifier;

import javax.lang.model.element.NestingKind;

import javax.tools.JavaFileObject;

/**

 * The SmartFileObject will return an outputstream that cache the written data

 * and compare the new content with the old content on disk. Only if they differ,

 * will the file be updated.

 *

 *  <p><b>This is NOT part of any supported API.

 *  If you write code that depends on this, you do so at your own risk.

 *  This code and its internal interfaces are subject to change or

 *  deletion without notice.</b>

 */

public class SmartFileObject implements JavaFileObject {

    JavaFileObject file;

    PrintWriter stdout;

    public SmartFileObject(JavaFileObject r, PrintWriter pw) {

        file = r;

        stdout = pw;

    }

    @Override

    public boolean equals(Object other) {

        return file.equals(other);

    }

    @Override

    public int hashCode() {

        return file.hashCode();

    }

    public Kind getKind() {

        return file.getKind();

    }

    public boolean isNameCompatible(String simpleName, Kind kind) {

        return file.isNameCompatible(simpleName, kind);

    }

    public URI toUri() {

        return file.toUri();

    }

    public String getName() {

        return file.getName();

    }

    public InputStream openInputStream() throws IOException {

        return file.openInputStream();

    }

    public OutputStream openOutputStream() throws IOException {

        return file.openOutputStream();

    }

    public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {

        return file.getCharContent(ignoreEncodingErrors);

    }

    static String lineseparator = System.getProperty("line.separator");

    public Writer openWriter() throws IOException {

        StringBuilder s = new StringBuilder();

        try (BufferedReader r = new BufferedReader(file.openReader(true))) {

            while (r.ready()) {

                s.append(r.readLine()+lineseparator);

            }

        } catch (FileNotFoundException e) {

            // Perfectly ok.

        }

        return new SmartWriter(file, s.toString(), file.getName(), stdout);

    }

    public long getLastModified() {

        return file.getLastModified();

    }

    public boolean delete() {

        return file.delete();

    }

    public Modifier getAccessLevel() {

        return file.getAccessLevel();

    }

    public NestingKind getNestingKind() {

        return file.getNestingKind();

    }

    public Reader openReader(boolean ignoreEncodingErrors) throws IOException {

        return file.openReader(ignoreEncodingErrors);

    }

}