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give more helpful exceptions rather than returning null when zip file cannot be opened 

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1760708 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Javen O'Neal 2016-09-14 13:28:27 +00:00
parent db1fd20584
commit 475f7ee866
1 changed files with 8 additions and 2 deletions
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10
src/ooxml/java/org/apache/poi/openxml4j/opc/internal/ZipHelper.java
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@ -19,6 +19,7 @@ package org.apache.poi.openxml4j.opc.internal;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
@ -239,10 +240,15 @@ public final class ZipHelper {
* @param file
* The file to open.
* @return The zip archive freshly open.
* @throws IOException if the zip file cannot be opened or closed to read the header signature
* @throws NotOfficeXmlFileException if stream does not start with zip header signature
*/
public static ZipFile openZipFile(File file) throws IOException {
public static ZipFile openZipFile(File file) throws IOException, NotOfficeXmlFileException {
if (!file.exists()) {
return null;
throw new FileNotFoundException("File does not exist");
}
if (file.isDirectory()) {
throw new IOException("File is a directory");
}
// Peek at the first few bytes to sanity check