1 files changed, 89 insertions, 0 deletions
diff --git a/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/content/TextContentDescriber.java b/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/content/TextContentDescriber.java
new file mode 100644
index 00000000..bfe4da15
--- /dev/null
+++ b/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/content/TextContentDescriber.java
@@ -0,0 +1,89 @@
+/*******************************************************************************
+ * Copyright (c) 2008-2010 Sonatype, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *      Sonatype, Inc. - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.m2e.core.internal.content;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Reader;
+
+import org.eclipse.core.runtime.QualifiedName;
+import org.eclipse.core.runtime.content.IContentDescription;
+import org.eclipse.core.runtime.content.ITextContentDescriber;
+
+/**
+ * A copy of org.eclipse.core.internal.content.TextContentDescriber to avoid internal API use.
+ * 
+ * This class provides internal basis for text-based content describers. 
+ * 
+ * <p>
+ * Note: do not add protected/public members to this class if you don't intend to 
+ * make them public API.
+ * </p>  
+ * 
+ * @see org.eclipse.core.runtime.content.XMLRootElementContentDescriber2
+ * @since 3.0
+ */
+class TextContentDescriber implements ITextContentDescriber {
+
+  private final static QualifiedName[] SUPPORTED_OPTIONS = {IContentDescription.BYTE_ORDER_MARK};
+
+  /*
+   *  (non-Javadoc)
+   * @see org.eclipse.core.runtime.content.ITextContentDescriber#describe(java.io.Reader, org.eclipse.core.runtime.content.IContentDescription)
+   */
+  @SuppressWarnings("unused")
+  public int describe(Reader contents, IContentDescription description) throws IOException {
+    // we want to be pretty loose on detecting the text content type  
+    return INDETERMINATE;
+  }
+
+  /*
+   *  (non-Javadoc)
+   * @see org.eclipse.core.runtime.content.IContentDescriber#describe(java.io.InputStream, org.eclipse.core.runtime.content.IContentDescription)
+   */
+  public int describe(InputStream contents, IContentDescription description) throws IOException {
+    if (description == null || !description.isRequested(IContentDescription.BYTE_ORDER_MARK))
+      return INDETERMINATE;
+    byte[] bom = getByteOrderMark(contents);
+    if (bom != null)
+      description.setProperty(IContentDescription.BYTE_ORDER_MARK, bom);
+    // we want to be pretty loose on detecting the text content type      
+    return INDETERMINATE;
+  }
+
+  /*
+   *  (non-Javadoc)
+   * @see org.eclipse.core.runtime.content.IContentDescriber#getSupportedOptions()
+   */
+  public QualifiedName[] getSupportedOptions() {
+    return SUPPORTED_OPTIONS;
+  }
+
+  byte[] getByteOrderMark(InputStream input) throws IOException {
+    int first = input.read();
+    if (first == 0xEF) {
+      //look for the UTF-8 Byte Order Mark (BOM)
+      int second = input.read();
+      int third = input.read();
+      if (second == 0xBB && third == 0xBF)
+        return IContentDescription.BOM_UTF_8;
+    } else if (first == 0xFE) {
+      //look for the UTF-16 BOM
+      if (input.read() == 0xFF)
+        return IContentDescription.BOM_UTF_16BE;
+    } else if (first == 0xFF) {
+      if (input.read() == 0xFE)
+        return IContentDescription.BOM_UTF_16LE;
+    }
+    return null;
+  }
+}