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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012-2014 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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 */
package org.glassfish.tyrus.core;

import java.io.IOException;
import java.io.Writer;

/**
 * Simple Writer that writes its data to
 * an async sink.
 *
 * @author Danny Coward (danny.coward at oracle.com)
 */
class WriterToAsyncTextAdapter extends Writer {
    private final TyrusRemoteEndpoint re;
    private String buffer = null;

    public WriterToAsyncTextAdapter(TyrusRemoteEndpoint re) {
        this.re = re;
    }

    private void sendBuffer(boolean last) {
        re.sendText(buffer, last);
    }

    @Override
    public void write(char[] chars, int index, int len) throws IOException {
        if (buffer != null) {
            this.sendBuffer(false);
        }
        buffer = (new String(chars)).substring(index, index + len);

    }

    @Override
    public void flush() throws IOException {
        this.sendBuffer(false);
        buffer = null;
    }

    @Override
    public void close() throws IOException {
        this.sendBuffer(true);
    }
}