Merge "Make ADT use the new layoutlib API."

1 files changed, 143 insertions, 0 deletions

diff --git a/layoutlib_utils/src/com/android/ide/common/layoutlib/LayoutLibrary.java b/layoutlib_utils/src/com/android/ide/common/layoutlib/LayoutLibrary.java
new file mode 100644
index 0000000..5ec7ae5
--- /dev/null
+++ b/layoutlib_utils/src/com/android/ide/common/layoutlib/LayoutLibrary.java
@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) 2010 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.ide.common.layoutlib;
+
+import com.android.ide.common.log.ILogger;
+import com.android.ide.common.sdk.LoadStatus;
+import com.android.layoutlib.api.ILayoutBridge;
+import com.android.layoutlib.api.LayoutBridge;
+
+import java.io.File;
+import java.lang.reflect.Constructor;
+import java.net.URI;
+import java.net.URL;
+import java.net.URLClassLoader;
+
+/**
+ * Class representing and allowing to load the layoutlib jar file.
+ */
+@SuppressWarnings("deprecation")
+public class LayoutLibrary {
+
+    public final static String CLASS_BRIDGE = "com.android.layoutlib.bridge.Bridge"; //$NON-NLS-1$
+
+    /** Link to the layout bridge */
+    private final LayoutBridge mBridge;
+    /** Status of the layoutlib.jar loading */
+    private final LoadStatus mStatus;
+    /** classloader used to load the jar file */
+    private final ClassLoader mClassLoader;
+
+    /**
+     * Returns the loaded {@link LayoutBridge} object or null if the loading failed.
+     */
+    public LayoutBridge getBridge() {
+        return mBridge;
+    }
+
+    /**
+     * Returns the {@link LoadStatus} of the loading of the layoutlib jar file.
+     */
+    public LoadStatus getStatus() {
+        return mStatus;
+    }
+
+    /**
+     * Returns the classloader used to load the classes in the layoutlib jar file.
+     */
+    public ClassLoader getClassLoader() {
+        return mClassLoader;
+    }
+
+    /**
+     * Loads the layoutlib.jar file located at the given path and returns a {@link LayoutLibrary}
+     * object representing the result.
+     * <p/>
+     * If loading failed {@link #getStatus()} will reflect this, and {@link #getBridge()} will
+     * return null.
+     *
+     * @param layoutLibJarOsPath the path of the jar file
+     * @param log an optional log file.
+     * @return a {@link LayoutLibrary} object always.
+     */
+    public static LayoutLibrary load(String layoutLibJarOsPath, ILogger log) {
+
+        LoadStatus status = LoadStatus.LOADING;
+        LayoutBridge bridge = null;
+        ClassLoader classLoader = null;
+
+        try {
+            // get the URL for the file.
+            File f = new File(layoutLibJarOsPath);
+            if (f.isFile() == false) {
+                if (log != null) {
+                    log.error(null, "layoutlib.jar is missing!"); //$NON-NLS-1$
+                }
+            } else {
+                URI uri = f.toURI();
+                URL url = uri.toURL();
+
+                // create a class loader. Because this jar reference interfaces
+                // that are in the editors plugin, it's important to provide
+                // a parent class loader.
+                classLoader = new URLClassLoader(
+                        new URL[] { url },
+                        LayoutLibrary.class.getClassLoader());
+
+                // load the class
+                Class<?> clazz = classLoader.loadClass(CLASS_BRIDGE);
+                if (clazz != null) {
+                    // instantiate an object of the class.
+                    Constructor<?> constructor = clazz.getConstructor();
+                    if (constructor != null) {
+                        Object bridgeObject = constructor.newInstance();
+                        if (bridgeObject instanceof LayoutBridge) {
+                            bridge = (LayoutBridge)bridgeObject;
+                        } else if (bridgeObject instanceof ILayoutBridge) {
+                            bridge = new LayoutBridgeWrapper((ILayoutBridge) bridgeObject,
+                                    classLoader);
+                        }
+                    }
+                }
+
+                if (bridge == null) {
+                    status = LoadStatus.FAILED;
+                    if (log != null) {
+                        log.error(null, "Failed to load " + CLASS_BRIDGE); //$NON-NLS-1$
+                    }
+                } else {
+                    // mark the lib as loaded.
+                    status = LoadStatus.LOADED;
+                }
+            }
+        } catch (Throwable t) {
+            status = LoadStatus.FAILED;
+            // log the error.
+            if (log != null) {
+                log.error(t, "Failed to load the LayoutLib");
+            }
+        }
+
+        return new LayoutLibrary(bridge, classLoader, status);
+    }
+
+    private LayoutLibrary(LayoutBridge bridge, ClassLoader classLoader, LoadStatus status) {
+        mBridge = bridge;
+        mClassLoader = classLoader;
+        mStatus = status;
+    }
+}