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/*******************************************************************************
 * Copyright 2020 [email protected].
 * 
 * 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 page.foliage.jdbc.antlr;

import org.antlr.v4.runtime.CharStream;
import org.antlr.v4.runtime.misc.Interval;

/**
 * 
 * 
 * @author [email protected]
 * @version 1.0.0
 */
public class CaseChangingCharStream implements CharStream {

    // ------------------------------------------------------------------------

    private final CharStream stream;

    private final boolean upper;

    // ------------------------------------------------------------------------

    public CaseChangingCharStream(CharStream stream, boolean upper) {
        this.stream = stream;
        this.upper = upper;
    }

    @Override
    public String getText(Interval interval) {
        return stream.getText(interval);
    }

    @Override
    public void consume() {
        stream.consume();
    }

    @Override
    public int LA(int i) {
        int c = stream.LA(i);
        if (c <= 0) { return c; }
        if (upper) { return Character.toUpperCase(c); }
        return Character.toLowerCase(c);
    }

    @Override
    public int mark() {
        return stream.mark();
    }

    @Override
    public void release(int marker) {
        stream.release(marker);
    }

    @Override
    public int index() {
        return stream.index();
    }

    @Override
    public void seek(int index) {
        stream.seek(index);
    }

    @Override
    public int size() {
        return stream.size();
    }

    @Override
    public String getSourceName() {
        return stream.getSourceName();
    }

}