foundation/org.eclipse.persistence.core.test.framework/src/main/java/org/eclipse/persistence/tools/beans/TextAreaOutputStream.java

/*
 * Copyright (c) 1998, 2021 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Oracle - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.tools.beans;

import java.io.*;
import javax.swing.*;

/**
 * This class can be used to wrapper a window as a stream.
 */
public class TextAreaOutputStream extends OutputStream {
    protected JTextArea text;
    protected boolean shouldAutoScroll;

    public TextAreaOutputStream(JTextArea text) {
        this(text, false);
    }

    public TextAreaOutputStream(JTextArea text, boolean shouldAutoScroll) {
        this.text = text;
        this.shouldAutoScroll = shouldAutoScroll;
    }

    public JTextArea getText() {
        return text;
    }

    /**
     * Append the char to the text area.
     */
    public void scrollToEnd() {
        if (shouldAutoScroll()) {
            if (getText().getParent() instanceof JViewport) {
                int max =
                    ((JScrollPane)(getText().getParent().getParent())).getVerticalScrollBar().getMaximum();
                ((JScrollPane)(getText().getParent().getParent())).getVerticalScrollBar().setValue(max);
            }
        }
    }

    /**
     * JDK 1.2.2 has a auto scroll problem when threads are used.
     * This can be used to fix it.
     */
    public void setShouldAutoScroll(boolean shouldAutoScroll) {
        this.shouldAutoScroll = shouldAutoScroll;
    }

    public void setText(JTextArea text) {
        this.text = text;
    }

    /**
     * JDK 1.2.2 has a auto scroll problem when threads are used.
     * This can be used to fix it.
     */
    public boolean shouldAutoScroll() {
        return shouldAutoScroll;
    }

    /**
     * Append the char to the text area.
     */
    @Override
    public void write(byte[] bytes) {
        getText().append(new String(bytes));
        scrollToEnd();
    }

    /**
     * Append the char to the text area.
     */
    @Override
    public void write(byte[] bytes, int offset, int length) {
        byte[] buffer = new byte[length];
        System.arraycopy(bytes, offset, buffer, 0, length);
        getText().append(new String(buffer));
        scrollToEnd();
    }

    /**
     * Append the char to the text area.
     */
    @Override
    public void write(int b) {
        byte[] bytes = new byte[1];
        bytes[0] = (byte)b;
        getText().append(new String(bytes));
        scrollToEnd();
    }
}