001/*
002 * Copyright 2018 Paul Schaub.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.pgpainless.decryption_verification;
017
018import javax.annotation.Nonnull;
019import java.io.IOException;
020import java.io.InputStream;
021
022public class DecryptionStream extends InputStream {
023
024    private final InputStream inputStream;
025    private final OpenPgpMetadata.Builder resultBuilder;
026    private boolean isClosed = false;
027
028    DecryptionStream(@Nonnull InputStream wrapped, @Nonnull OpenPgpMetadata.Builder resultBuilder) {
029        this.inputStream = wrapped;
030        this.resultBuilder = resultBuilder;
031    }
032
033    @Override
034    public int read() throws IOException {
035        return inputStream.read();
036    }
037
038    @Override
039    public void close() throws IOException {
040        inputStream.close();
041        this.isClosed = true;
042    }
043
044    public OpenPgpMetadata getResult() {
045        if (!isClosed) {
046            throw new IllegalStateException("DecryptionStream MUST be closed before the result can be accessed.");
047        }
048        return resultBuilder.build();
049    }
050}