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Move File-based MultiPassStrategy from factory method into own class
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...main/java/org/pgpainless/signature/cleartext_signatures/WriteToFileMultiPassStrategy.java
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/* | ||
* Copyright 2021 Paul Schaub. | ||
* | ||
* 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.pgpainless.signature.cleartext_signatures; | ||
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import java.io.File; | ||
import java.io.FileInputStream; | ||
import java.io.FileOutputStream; | ||
import java.io.IOException; | ||
import java.io.InputStream; | ||
import java.io.OutputStream; | ||
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/** | ||
* File-based multi-pass strategy. | ||
* When processing the signed data the first time, the data is being written out into a file. | ||
* For the second pass, that file is being read again. | ||
*/ | ||
public class WriteToFileMultiPassStrategy implements MultiPassStrategy { | ||
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private final File file; | ||
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/** | ||
* Create a {@link MultiPassStrategy} which writes data to a file. | ||
* Note that {@link #getMessageOutputStream()} will create the file if necessary. | ||
* | ||
* @param file file to write the data to and read from | ||
*/ | ||
public WriteToFileMultiPassStrategy(File file) { | ||
this.file = file; | ||
} | ||
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@Override | ||
public OutputStream getMessageOutputStream() throws IOException { | ||
if (!file.exists()) { | ||
boolean created = file.createNewFile(); | ||
if (!created) { | ||
throw new IOException("New file '" + file.getAbsolutePath() + "' was not created."); | ||
} | ||
} | ||
return new FileOutputStream(file); | ||
} | ||
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@Override | ||
public InputStream getMessageInputStream() throws IOException { | ||
if (!file.exists()) { | ||
throw new IOException("File '" + file.getAbsolutePath() + "' does no longer exist."); | ||
} | ||
return new FileInputStream(file); | ||
} | ||
} |