1 files changed, 105 insertions, 0 deletions
diff --git a/anttasks/src/com/android/ant/CheckEnvTask.java b/anttasks/src/com/android/ant/CheckEnvTask.java
new file mode 100644
index 0000000..d6b6cc4
--- /dev/null
+++ b/anttasks/src/com/android/ant/CheckEnvTask.java
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2012 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 org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.Project;
+import org.apache.tools.ant.Task;
+import org.apache.tools.ant.util.DeweyDecimal;
+
+import java.io.File;
+
+/**
+ * Checks the Ant environment to make sure Android builds
+ * can run.
+ *
+ * No parameters are neeed.
+ *
+ */
+public class CheckEnvTask extends Task {
+
+    private final static String ANT_MIN_VERSION = "1.8.0";
+
+    @Override
+    public void execute() {
+
+        Project antProject = getProject();
+
+        // check the Ant version
+        DeweyDecimal version = getVersion(antProject);
+        DeweyDecimal atLeast = new DeweyDecimal(ANT_MIN_VERSION);
+        if (atLeast.isGreaterThan(version)) {
+            throw new BuildException(
+                    "The Android Ant-based build system requires Ant " +
+                    ANT_MIN_VERSION +
+                    " or later. Current version is " +
+                    version);
+        }
+
+        // get the SDK location
+        File sdkDir = TaskHelper.getSdkLocation(antProject);
+
+        // detect that the platform tools is there.
+        File platformTools = new File(sdkDir, SdkConstants.FD_PLATFORM_TOOLS);
+        if (platformTools.isDirectory() == false) {
+            throw new BuildException(String.format(
+                    "SDK Platform Tools component is missing. " +
+                    "Please install it with the SDK Manager (%1$s%2$c%3$s)",
+                    SdkConstants.FD_TOOLS,
+                    File.separatorChar,
+                    SdkConstants.androidCmdName()));
+        }
+
+        // display SDK Tools revision
+        int toolsRevison = TaskHelper.getToolsRevision(sdkDir);
+        if (toolsRevison != -1) {
+            System.out.println("Android SDK Tools Revision " + toolsRevison);
+            System.out.println("Installed at " + sdkDir.getAbsolutePath());
+        }
+    }
+
+    /**
+     * Returns the Ant version as a {@link DeweyDecimal} object.
+     *
+     * This is based on the implementation of
+     * org.apache.tools.ant.taskdefs.condition.AntVersion.getVersion()
+     *
+     * @param antProject the current ant project.
+     * @return the ant version.
+     */
+    private DeweyDecimal getVersion(Project antProject) {
+        char[] versionString = antProject.getProperty("ant.version").toCharArray();
+        StringBuilder sb = new StringBuilder();
+        boolean foundFirstDigit = false;
+        for (int i = 0; i < versionString.length; i++) {
+            if (Character.isDigit(versionString[i])) {
+                sb.append(versionString[i]);
+                foundFirstDigit = true;
+            }
+            if (versionString[i] == '.' && foundFirstDigit) {
+                sb.append(versionString[i]);
+            }
+            if (Character.isLetter(versionString[i]) && foundFirstDigit) {
+                break;
+            }
+        }
+        return new DeweyDecimal(sb.toString());
+    }
+
+}