dorkbox.inputConsole.unsupported.UnsupportedTerminal Maven / Gradle / Ivy

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Unbuffered input for Java for linux, mac, windows.
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/*
 * Copyright 2010 dorkbox, llc
 *
 * 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 dorkbox.inputConsole.unsupported;

import java.io.IOException;
import java.io.InputStream;

import dorkbox.inputConsole.Terminal;
import dorkbox.util.bytes.ByteBuffer2;

public class UnsupportedTerminal extends Terminal {

    private final ByteBuffer2 buffer = new ByteBuffer2(8, -1);

    private int readerCount = -1;
    private final InputStream in;

    public UnsupportedTerminal() {
        this.in = System.in;
    }

    @Override
    public final void init() throws IOException {}

    @Override
    public final void restore() {}

    @Override
    public final int getWidth() {
        return 0;
    }

    @Override
    public final int getHeight() {
        return 0;
    }

    @Override
    public final int read() {
        // if we are reading data (because we are in IDE mode), we want to return ALL the chars of the line!

        // so, 'readerCount' is REALLY the index at which we return letters (until the whole string is returned)
        if (this.readerCount == -1) {
            // we have to wait for more data.
            try {
                InputStream sysIn = this.in;
                int read;
                char asChar;
                this.buffer.clearSecure();

                while ((read = sysIn.read()) != -1) {
                    asChar = (char) read;
                    if (asChar == '\n') {
                        this.readerCount = this.buffer.position();
                        this.buffer.rewind();
                        break;
                    } else {
                        this.buffer.writeChar(asChar);
                    }
                }
            } catch (IOException ignored) {
            }
        }

        // EACH thread will have it's own count!
        if (this.readerCount == this.buffer.position()) {
            this.readerCount = -1;
            return '\n';
        } else {
            return this.buffer.readChar();
        }
    }
}