| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * |
| * Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/org/documents/epl-v10.php |
| * |
| * 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.eclipse.adt.internal.editors.layout; |
| |
| import com.android.ide.eclipse.adt.AdtPlugin; |
| import com.android.ide.eclipse.adt.AndroidConstants; |
| import com.android.ide.eclipse.adt.internal.project.AndroidManifestParser; |
| import com.android.ide.eclipse.adt.internal.resources.manager.ProjectClassLoader; |
| import com.android.ide.eclipse.adt.internal.resources.manager.ProjectResources; |
| import com.android.layoutlib.api.IProjectCallback; |
| |
| import org.eclipse.core.resources.IFile; |
| import org.eclipse.core.resources.IProject; |
| import org.eclipse.core.runtime.CoreException; |
| |
| import java.lang.reflect.Constructor; |
| import java.util.HashMap; |
| |
| /** |
| * Loader for Android Project class in order to use them in the layout editor. |
| */ |
| public final class ProjectCallback implements IProjectCallback { |
| |
| private final HashMap<String, Class<?>> mLoadedClasses = new HashMap<String, Class<?>>(); |
| private final IProject mProject; |
| private final ClassLoader mParentClassLoader; |
| private final ProjectResources mProjectRes; |
| private boolean mUsed = false; |
| private String mNamespace; |
| |
| ProjectCallback(ClassLoader classLoader, ProjectResources projectRes, IProject project) { |
| mParentClassLoader = classLoader; |
| mProjectRes = projectRes; |
| mProject = project; |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| * |
| * This implementation goes through the output directory of the Eclipse project and loads the |
| * <code>.class</code> file directly. |
| */ |
| @SuppressWarnings("unchecked") |
| public Object loadView(String className, Class[] constructorSignature, |
| Object[] constructorParameters) |
| throws ClassNotFoundException, Exception { |
| |
| // look for a cached version |
| Class<?> clazz = mLoadedClasses.get(className); |
| if (clazz != null) { |
| return instantiateClass(clazz, constructorSignature, constructorParameters); |
| } |
| |
| // load the class. |
| ProjectClassLoader loader = new ProjectClassLoader(mParentClassLoader, mProject); |
| try { |
| clazz = loader.loadClass(className); |
| |
| if (clazz != null) { |
| mUsed = true; |
| mLoadedClasses.put(className, clazz); |
| return instantiateClass(clazz, constructorSignature, constructorParameters); |
| } |
| } catch (Error e) { |
| // Log this error with the class name we're trying to load and abort. |
| AdtPlugin.log(e, "ProjectCallback.loadView failed to find class %1$s", className); //$NON-NLS-1$ |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Returns the namespace for the project. The namespace contains a standard part + the |
| * application package. |
| * |
| * @return The package namespace of the project or null in case of error. |
| */ |
| public String getNamespace() { |
| if (mNamespace == null) { |
| IFile manifestFile = AndroidManifestParser.getManifest(mProject); |
| try { |
| AndroidManifestParser data = AndroidManifestParser.parseForData(manifestFile); |
| String javaPackage = data.getPackage(); |
| mNamespace = String.format(AndroidConstants.NS_CUSTOM_RESOURCES, javaPackage); |
| } catch (CoreException e) { |
| } |
| } |
| |
| return mNamespace; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * @see com.android.layoutlib.api.IProjectCallback#resolveResourceValue(int) |
| */ |
| public String[] resolveResourceValue(int id) { |
| if (mProjectRes != null) { |
| return mProjectRes.resolveResourceValue(id); |
| } |
| |
| return null; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * @see com.android.layoutlib.api.IProjectCallback#resolveResourceValue(int[]) |
| */ |
| public String resolveResourceValue(int[] id) { |
| if (mProjectRes != null) { |
| return mProjectRes.resolveResourceValue(id); |
| } |
| |
| return null; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * @see com.android.layoutlib.api.IProjectCallback#getResourceValue(java.lang.String, java.lang.String) |
| */ |
| public Integer getResourceValue(String type, String name) { |
| if (mProjectRes != null) { |
| return mProjectRes.getResourceValue(type, name); |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Returns whether the loader has received requests to load custom views. |
| * <p/>This allows to efficiently only recreate when needed upon code change in the project. |
| */ |
| boolean isUsed() { |
| return mUsed; |
| } |
| |
| /** |
| * Instantiate a class object, using a specific constructor and parameters. |
| * @param clazz the class to instantiate |
| * @param constructorSignature the signature of the constructor to use |
| * @param constructorParameters the parameters to use in the constructor. |
| * @return A new class object, created using a specific constructor and parameters. |
| * @throws Exception |
| */ |
| @SuppressWarnings("unchecked") |
| private Object instantiateClass(Class<?> clazz, Class[] constructorSignature, |
| Object[] constructorParameters) throws Exception { |
| Constructor<?> constructor = clazz.getConstructor(constructorSignature); |
| constructor.setAccessible(true); |
| return constructor.newInstance(constructorParameters); |
| } |
| } |