/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.cdt.debug.internal.ui;

import java.io.IOException;
import java.io.Reader;

public abstract class SingleCharReader extends Reader {

	/**
	 * @see Reader#read()
	 */
	@Override
	public abstract int read() throws IOException;

	/**
	 * @see Reader#read(char[],int,int)
	 */
	@Override
	public int read(char cbuf[], int off, int len) throws IOException {
		int end = off + len;
		for (int i = off; i < end; i++) {
			int ch = read();
			if (ch == -1) {
				return (i == off) ? -1 : i - off;
			}
			cbuf[i] = (char) ch;
		}
		return len;
	}

	/**
	 * @see Reader#ready()
	 */
	@Override
	public boolean ready() throws IOException {
		return true;
	}

	/**
	 * Gets the content as a String
	 */
	public String getString() throws IOException {
		StringBuilder buf = new StringBuilder();
		int ch;
		while ((ch = read()) != -1) {
			buf.append((char) ch);
		}
		return buf.toString();
	}
}
