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/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * 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 org.bson.json;

// @deprecated Usage of this API is not supported in AEM as a Cloud Service.
@Deprecated(since = "2022-10-31")
class JsonStringBuffer implements JsonBuffer {

    private final String buffer;

    private int position;

    private boolean eof;

    JsonStringBuffer(final String buffer) {
        this.buffer = buffer;
    }

    public int getPosition() {
        return position;
    }

    public int read() {
        if (eof) {
            throw new JsonParseException("Trying to read past EOF.");
        } else if (position >= buffer.length()) {
            eof = true;
            return -1;
        } else {
            return (int) buffer.charAt(position++);
        }
    }

    public void unread(final int c) {
        eof = false;
        if (c != -1 && buffer.charAt(position - 1) == c) {
            position--;
        }
    }

    public int mark() {
        return position;
    }

    public void reset(final int markPos) {
        if (markPos > position) {
            throw new IllegalStateException("mark cannot reset ahead of position, only back");
        }
        position = markPos;
    }

    public void discard(final int markPos) {
    }
}