001/*-
002 * #%L
003 * HAPI FHIR - Core Library
004 * %%
005 * Copyright (C) 2014 - 2025 Smile CDR, Inc.
006 * %%
007 * Licensed under the Apache License, Version 2.0 (the "License");
008 * you may not use this file except in compliance with the License.
009 * You may obtain a copy of the License at
010 *
011 *      http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 * #L%
019 */
020package ca.uhn.fhir.parser;
021
022import jakarta.annotation.Nonnull;
023
024import java.io.IOException;
025import java.io.Reader;
026import java.io.StringWriter;
027
028public class PreserveStringReader extends Reader {
029
030        private final Reader myReader;
031
032        private final StringWriter myWriter;
033
034        public PreserveStringReader(Reader theReader) {
035                super(theReader);
036                myReader = theReader;
037                myWriter = new StringWriter();
038        }
039
040        @Override
041        public int read(@Nonnull char[] theBuffer, int theOffset, int theLength) throws IOException {
042                int out = myReader.read(theBuffer, theOffset, theLength);
043                if (out >= 0) {
044                        myWriter.write(theBuffer, theOffset, out);
045                }
046
047                return out;
048        }
049
050        @Override
051        public void close() throws IOException {
052                myReader.close();
053                myWriter.close();
054        }
055
056        public boolean hasString() {
057                return myWriter.getBuffer().length() > 0;
058        }
059
060        public String toString() {
061                return myWriter.toString();
062        }
063}