Fix bug #56164 - Tidy up the OPC SAX setup code with a new common Helper

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1569991 13f79535-47bb-0310-9956-ffa450edef68

src/ooxml/java/org/apache/poi/openxml4j/opc/PackageRelationshipCollection.java

@@ -26,10 +26,10 @@ Licensed to the Apache Software Foundation (ASF) under one or more
 import org.apache.poi.openxml4j.exceptions.InvalidOperationException;
 import org.apache.poi.util.POILogFactory;
 import org.apache.poi.util.POILogger;
+import org.apache.poi.util.SAXHelper;
 import org.dom4j.Attribute;
 import org.dom4j.Document;
 import org.dom4j.Element;
-import org.dom4j.io.SAXReader;
 
 /**
  * Represents a collection of PackageRelationship elements that are owned by a
@@ -309,10 +309,8 @@ public int size() {
     private void parseRelationshipsPart(PackagePart relPart)
             throws InvalidFormatException {
         try {
-            SAXReader reader = new SAXReader();
             logger.log(POILogger.DEBUG, "Parsing relationship: " + relPart.getPartName());
-            Document xmlRelationshipsDoc = reader
-                    .read(relPart.getInputStream());
+            Document xmlRelationshipsDoc = SAXHelper.readSAXDocument(relPart.getInputStream());
 
             // Browse default types
             Element root = xmlRelationshipsDoc.getRootElement();

src/ooxml/java/org/apache/poi/openxml4j/opc/internal/ContentTypeManager.java

@@ -23,8 +23,8 @@ Licensed to the Apache Software Foundation (ASF) under one or more
 import java.net.URISyntaxException;
 import java.util.Iterator;
 import java.util.List;
-import java.util.TreeMap;
 import java.util.Map.Entry;
+import java.util.TreeMap;
 
 import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
 import org.apache.poi.openxml4j.exceptions.InvalidOperationException;
@@ -33,13 +33,13 @@ Licensed to the Apache Software Foundation (ASF) under one or more
 import org.apache.poi.openxml4j.opc.PackagePart;
 import org.apache.poi.openxml4j.opc.PackagePartName;
 import org.apache.poi.openxml4j.opc.PackagingURIHelper;
+import org.apache.poi.util.SAXHelper;
 import org.dom4j.Document;
 import org.dom4j.DocumentException;
 import org.dom4j.DocumentHelper;
 import org.dom4j.Element;
 import org.dom4j.Namespace;
 import org.dom4j.QName;
-import org.dom4j.io.SAXReader;
 
 /**
  * Manage package content types ([Content_Types].xml part).
@@ -373,8 +373,7 @@ public void clearOverrideContentTypes() {
 	private void parseContentTypesFile(InputStream in)
 			throws InvalidFormatException {
 		try {
-			SAXReader xmlReader = new SAXReader();
-			Document xmlContentTypetDoc = xmlReader.read(in);
+			Document xmlContentTypetDoc = SAXHelper.readSAXDocument(in);
 
 			// Default content types
 			List defaultTypes = xmlContentTypetDoc.getRootElement().elements(

src/ooxml/java/org/apache/poi/openxml4j/opc/internal/unmarshallers/PackagePropertiesUnmarshaller.java

@@ -23,13 +23,6 @@ Licensed to the Apache Software Foundation (ASF) under one or more
 import java.util.List;
 import java.util.zip.ZipEntry;
 
-import org.dom4j.Attribute;
-import org.dom4j.Document;
-import org.dom4j.DocumentException;
-import org.dom4j.Element;
-import org.dom4j.Namespace;
-import org.dom4j.QName;
-import org.dom4j.io.SAXReader;
 import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
 import org.apache.poi.openxml4j.opc.PackageNamespaces;
 import org.apache.poi.openxml4j.opc.PackagePart;
@@ -38,6 +31,13 @@ Licensed to the Apache Software Foundation (ASF) under one or more
 import org.apache.poi.openxml4j.opc.internal.PackagePropertiesPart;
 import org.apache.poi.openxml4j.opc.internal.PartUnmarshaller;
 import org.apache.poi.openxml4j.opc.internal.ZipHelper;
+import org.apache.poi.util.SAXHelper;
+import org.dom4j.Attribute;
+import org.dom4j.Document;
+import org.dom4j.DocumentException;
+import org.dom4j.Element;
+import org.dom4j.Namespace;
+import org.dom4j.QName;
 
 /**
  * Package properties unmarshaller.
@@ -118,10 +118,9 @@ public PackagePart unmarshall(UnmarshallContext context, InputStream in)
 						"Error while trying to get the part input stream.");
 		}
 
-		SAXReader xmlReader = new SAXReader();
 		Document xmlDoc;
 		try {
-			xmlDoc = xmlReader.read(in);
+			xmlDoc = SAXHelper.readSAXDocument(in);
 
 			/* Check OPC compliance */
 

src/ooxml/java/org/apache/poi/util/SAXHelper.java

@@ -0,0 +1,59 @@
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You 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.apache.poi.util;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.StringReader;
+
+import org.dom4j.Document;
+import org.dom4j.DocumentException;
+import org.dom4j.io.SAXReader;
+import org.xml.sax.EntityResolver;
+import org.xml.sax.InputSource;
+import org.xml.sax.SAXException;
+
+
+/**
+ * Provides handy methods for working with SAX parsers and readers
+ */
+public final class SAXHelper {
+    /**
+     * Creates a new SAX Reader, with sensible defaults
+     */
+    public static SAXReader getSAXReader() {
+        SAXReader xmlReader = new SAXReader();
+        xmlReader.setEntityResolver(new EntityResolver() {
+            public InputSource resolveEntity(String publicId, String systemId)
+                    throws SAXException, IOException {
+                return new InputSource(new StringReader(""));
+            }
+        });
+        return xmlReader;
+    }
+
+    /**
+     * Parses the given stream via the default (sensible)
+     * SAX Reader
+     * @param inp Stream to read the XML data from
+     * @return the SAX processed Document 
+     */
+    public static Document readSAXDocument(InputStream inp) throws DocumentException {
+        return getSAXReader().read(inp);
+    }
+}

src/ooxml/testcases/org/apache/poi/openxml4j/opc/TestPackage.java

@@ -17,10 +17,19 @@ Licensed to the Apache Software Foundation (ASF) under one or more
 
 package org.apache.poi.openxml4j.opc;
 
-import java.io.*;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
 import java.lang.reflect.Field;
 import java.net.URI;
-import java.util.*;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.TreeMap;
 import java.util.regex.Pattern;
 
 import junit.framework.TestCase;
@@ -31,15 +40,15 @@ Licensed to the Apache Software Foundation (ASF) under one or more
 import org.apache.poi.openxml4j.opc.internal.ContentTypeManager;
 import org.apache.poi.openxml4j.opc.internal.FileHelper;
 import org.apache.poi.openxml4j.opc.internal.PackagePropertiesPart;
-import org.apache.poi.util.TempFile;
-import org.apache.poi.util.POILogger;
 import org.apache.poi.util.POILogFactory;
+import org.apache.poi.util.POILogger;
+import org.apache.poi.util.SAXHelper;
+import org.apache.poi.util.TempFile;
 import org.dom4j.Document;
 import org.dom4j.DocumentHelper;
 import org.dom4j.Element;
 import org.dom4j.Namespace;
 import org.dom4j.QName;
-import org.dom4j.io.SAXReader;
 
 public final class TestPackage extends TestCase {
     private static final POILogger logger = POILogFactory.getLogger(TestPackage.class);
@@ -211,9 +220,8 @@ public void testCreatePackageWithCoreDocument() throws Exception {
     private void assertMSCompatibility(OPCPackage pkg) throws Exception {
         PackagePartName relName = PackagingURIHelper.createPartName(PackageRelationship.getContainerPartRelationship());
         PackagePart relPart = pkg.getPart(relName);
-        SAXReader reader = new SAXReader();
-        Document xmlRelationshipsDoc = reader
-                .read(relPart.getInputStream());
+
+        Document xmlRelationshipsDoc = SAXHelper.readSAXDocument(relPart.getInputStream());
 
         Element root = xmlRelationshipsDoc.getRootElement();
         for (Iterator i = root