1 files changed, 96 insertions, 0 deletions
diff --git a/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/content/PomFileContentDescriber.java b/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/content/PomFileContentDescriber.java
new file mode 100644
index 00000000..49c9a868
--- /dev/null
+++ b/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/content/PomFileContentDescriber.java
@@ -0,0 +1,96 @@
+/*******************************************************************************
+ * 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 javax.xml.parsers.ParserConfigurationException;
+
+import org.xml.sax.InputSource;
+import org.xml.sax.SAXException;
+
+import org.eclipse.core.runtime.content.IContentDescription;
+
+import org.eclipse.m2e.core.internal.Messages;
+
+
+/**
+ * A content describer for POM files.
+ * 
+ * @see org.eclipse.ant.internal.core.contentDescriber.AntBuildfileContentDescriber
+ * @author Herve Boutemy
+ * @since 0.9.6
+ */
+public final class PomFileContentDescriber extends XMLContentDescriber {
+  /**
+   * Determines the validation status for the given contents.
+   * 
+   * @param contents the contents to be evaluated
+   * @return one of the following:<ul>
+   * <li><code>VALID</code></li>,
+   * <li><code>INVALID</code></li>,
+   * <li><code>INDETERMINATE</code></li>
+   * </ul>
+   * @throws IOException
+   */
+  private int checkCriteria(InputSource contents) throws IOException {
+    PomHandler pomHandler = new PomHandler();
+    try {
+      if(!pomHandler.parseContents(contents)) {
+        return INDETERMINATE;
+      }
+    } catch(SAXException e) {
+      // we may be handed any kind of contents... it is normal we fail to parse
+      return INDETERMINATE;
+    } catch(ParserConfigurationException e) {
+      // some bad thing happened - force this describer to be disabled
+      throw new RuntimeException(Messages.PomFileContentDescriber_error);
+    }
+
+    // Check to see if we matched our criteria.
+    if(pomHandler.hasRootProjectElement()) {
+      if(pomHandler.hasArtifactIdElement()) {
+        //project and artifactId element 
+        return VALID;
+      }
+      //only a top level project element: maybe a POM file, but maybe an Ant buildfile, a site descriptor, ...
+      return INDETERMINATE;
+    }
+    return INDETERMINATE;
+  }
+
+  @Override
+  public int describe(InputStream contents, IContentDescription description) throws IOException {
+    // call the basic XML describer to do basic recognition
+    if(super.describe(contents, description) == INVALID) {
+      return INVALID;
+    }
+    // super.describe will have consumed some chars, need to rewind   
+    contents.reset();
+    // Check to see if we matched our criteria.   
+    return checkCriteria(new InputSource(contents));
+  }
+
+  @Override
+  public int describe(Reader contents, IContentDescription description) throws IOException {
+    // call the basic XML describer to do basic recognition
+    if(super.describe(contents, description) == INVALID) {
+      return INVALID;
+    }
+    // super.describe will have consumed some chars, need to rewind
+    contents.reset();
+    // Check to see if we matched our criteria.
+    return checkCriteria(new InputSource(contents));
+  }
+}