Merge change 26277 into eclair

* changes:
  Add an XPath Ant task to be used in the android_rules.xml file.

tools/anttasks/src/com/android/ant/AndroidXPathFactory.java

@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * 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 com.android.ant;
+
+import com.android.sdklib.SdkConstants;
+
+import java.util.Iterator;
+
+import javax.xml.XMLConstants;
+import javax.xml.namespace.NamespaceContext;
+import javax.xml.xpath.XPath;
+import javax.xml.xpath.XPathFactory;
+
+/**
+ * XPath factory with automatic support for the android namespace.
+ */
+class AndroidXPathFactory {
+    public final static String DEFAULT_NS_PREFIX = "android"; //$NON-NLS-1$
+
+    private final static XPathFactory sFactory = XPathFactory.newInstance();
+
+    /** Namespace context for Android resource XML files. */
+    private static class AndroidNamespaceContext implements NamespaceContext {
+        private String mAndroidPrefix;
+
+        /**
+         * Construct the context with the prefix associated with the android namespace.
+         * @param androidPrefix the Prefix
+         */
+        public AndroidNamespaceContext(String androidPrefix) {
+            mAndroidPrefix = androidPrefix;
+        }
+
+        public String getNamespaceURI(String prefix) {
+            if (prefix != null) {
+                if (prefix.equals(mAndroidPrefix)) {
+                    return SdkConstants.NS_RESOURCES;
+                }
+            }
+
+            return XMLConstants.NULL_NS_URI;
+        }
+
+        public String getPrefix(String namespaceURI) {
+            // This isn't necessary for our use.
+            assert false;
+            return null;
+        }
+
+        public Iterator<?> getPrefixes(String namespaceURI) {
+            // This isn't necessary for our use.
+            assert false;
+            return null;
+        }
+    }
+
+    /**
+     * Creates a new XPath object, specifying which prefix in the query is used for the
+     * android namespace.
+     * @param androidPrefix The namespace prefix.
+     */
+    public static XPath newXPath(String androidPrefix) {
+        XPath xpath = sFactory.newXPath();
+        xpath.setNamespaceContext(new AndroidNamespaceContext(androidPrefix));
+        return xpath;
+    }
+
+    /**
+     * Creates a new XPath object using the default prefix for the android namespace.
+     * @see #DEFAULT_NS_PREFIX
+     */
+    public static XPath newXPath() {
+        return newXPath(DEFAULT_NS_PREFIX);
+    }
+}

tools/anttasks/src/com/android/ant/XPathTask.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * 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 com.android.ant;
+
+import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.Task;
+import org.apache.tools.ant.types.Path;
+import org.xml.sax.InputSource;
+
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+
+import javax.xml.xpath.XPath;
+import javax.xml.xpath.XPathExpressionException;
+
+/**
+ * Android specific XPath task.
+ * The goal is to get the result of an XPath expression on Android XML files. The android namespace
+ * (http://schemas.android.com/apk/res/android) must be associated to the "android" prefix.
+ */
+public class XPathTask extends Task {
+
+    private Path mManifestFile;
+    private String mProperty;
+    private String mExpression;
+
+    public void setInput(Path manifestFile) {
+        mManifestFile = manifestFile;
+    }
+
+    public void setOutput(String property) {
+        mProperty = property;
+    }
+
+    public void setExpression(String expression) {
+        mExpression = expression;
+    }
+
+    @Override
+    public void execute() throws BuildException {
+        try {
+            if (mManifestFile == null || mManifestFile.list().length == 0) {
+                throw new BuildException("input attribute is missing!");
+            }
+
+            if (mProperty == null) {
+                throw new BuildException("output attribute is missing!");
+            }
+
+            if (mExpression == null) {
+                throw new BuildException("expression attribute is missing!");
+            }
+
+            XPath xpath = AndroidXPathFactory.newXPath();
+
+            String file = mManifestFile.list()[0];
+            String result = xpath.evaluate(mExpression, new InputSource(new FileInputStream(file)));
+
+            getProject().setProperty(mProperty, result);
+        } catch (XPathExpressionException e) {
+            throw new BuildException(e);
+        } catch (FileNotFoundException e) {
+            throw new BuildException(e);
+        }
+    }
+}