src/plugins/android.codeutils/src/com/motorola/studio/android/model/java/ActivityClass.java

/*
 * 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.motorola.studio.android.model.java;

import org.eclipse.jdt.core.dom.AST;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.ASTParser;
import org.eclipse.jdt.core.dom.Block;
import org.eclipse.jdt.core.dom.CompilationUnit;
import org.eclipse.jdt.core.dom.ImportDeclaration;
import org.eclipse.jdt.core.dom.MethodDeclaration;
import org.eclipse.jdt.core.dom.Modifier.ModifierKeyword;
import org.eclipse.jdt.core.dom.PrimitiveType;
import org.eclipse.jdt.core.dom.SingleVariableDeclaration;
import org.eclipse.jdt.core.dom.SuperMethodInvocation;
import org.eclipse.jdt.core.dom.Type;
import org.eclipse.jdt.core.dom.TypeDeclaration;
import org.eclipse.jdt.core.dom.rewrite.ASTRewrite;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.osgi.util.NLS;
import org.eclipse.text.edits.MalformedTreeException;
import org.eclipse.text.edits.TextEdit;

import com.motorola.studio.android.codeutils.i18n.CodeUtilsNLS;
import com.motorola.studio.android.common.exception.AndroidException;
import com.motorola.studio.android.common.log.StudioLogger;

/**
 * Class used to create an Android Activity building block class
 */
public class ActivityClass extends JavaClass
{
    public static final String ACTIVITY_SUPERCLASS = "android.app.Activity";

    private static final String[] BUNDLE_CLASS = getFQNAsArray("android.os.Bundle");

    protected static final String ONCREATE_METHOD_NAME = "onCreate";

    protected static final String ONSTART_METHOD_NAME = "onStart";

    private ASTRewrite rewrite = null;

    /**
     * The constructor
     * 
     * @param className The simple class name
     * @param packageName The full-qualified class package name
     * @param addOnStart If true, adds the OnStart method to the activity class
     */
    public ActivityClass(String className, String packageName, boolean addOnStart)
    {
        super(className, packageName, ACTIVITY_SUPERCLASS);
        addBasicActivityInfo();

        if (addOnStart)
        {
            addOnStartMethod();
        }
    }

    /**
     * Adds basic information to the activity class
     */
    private void addBasicActivityInfo()
    {
        addOnCreateMethod();

        // Adds JavaDoc to elements
        addComment(classDecl, CodeUtilsNLS.MODEL_ActivityClass_ActivityDescription);
    }

    /**
     * Adds the onCreate method to the activity class
     */
    @SuppressWarnings("unchecked")
    private void addOnCreateMethod()
    {
        // Adds import for Bundle
        ImportDeclaration intentImport = ast.newImportDeclaration();
        intentImport.setName(ast.newName(BUNDLE_CLASS));
        compUnit.imports().add(intentImport);

        MethodDeclaration onCreateMethod = ast.newMethodDeclaration();
        onCreateMethod.modifiers().add(ast.newModifier(ModifierKeyword.PROTECTED_KEYWORD));
        onCreateMethod.setReturnType2(ast.newPrimitiveType(PrimitiveType.VOID));
        onCreateMethod.setName(ast.newSimpleName(ONCREATE_METHOD_NAME));
        addMethodParameter(onCreateMethod, "savedInstanceState",
                ast.newSimpleType(ast.newSimpleName(getName(BUNDLE_CLASS))));
        addEmptyBlock(onCreateMethod);
        addSuperInvocation(onCreateMethod);
        classDecl.bodyDeclarations().add(onCreateMethod);

        // Adds JavaDoc to the method
        addComment(onCreateMethod, CodeUtilsNLS.MODEL_ActivityClass_OnCreateMethodDescription);
        addMethodReference(onCreateMethod, ACTIVITY_SUPERCLASS, ONCREATE_METHOD_NAME, new Type[]
        {
            ast.newSimpleType(ast.newSimpleName(getName(BUNDLE_CLASS)))
        });
    }

    /**
     * Adds the onStart method to the activity class
     */
    @SuppressWarnings("unchecked")
    private void addOnStartMethod()
    {
        MethodDeclaration onStartMethod = ast.newMethodDeclaration();
        onStartMethod.modifiers().add(ast.newModifier(ModifierKeyword.PROTECTED_KEYWORD));
        onStartMethod.setReturnType2(ast.newPrimitiveType(PrimitiveType.VOID));
        onStartMethod.setName(ast.newSimpleName(ONSTART_METHOD_NAME));
        addEmptyBlock(onStartMethod);
        addSuperInvocation(onStartMethod);
        classDecl.bodyDeclarations().add(onStartMethod);

        // Adds JavaDoc to the method
        addComment(onStartMethod, CodeUtilsNLS.MODEL_ActivityClass_OnStartMethodDescription);
        addMethodReference(onStartMethod, ACTIVITY_SUPERCLASS, ONSTART_METHOD_NAME, null);
    }

    /**
     * Adds a "super.method(arguments...)" statement inside the given method body
     * 
     * @param method The method declaration
     */
    @SuppressWarnings("unchecked")
    private void addSuperInvocation(MethodDeclaration method)
    {
        SuperMethodInvocation superInv = ast.newSuperMethodInvocation();
        superInv.setName(ast.newSimpleName(method.getName().toString()));
        for (Object param : method.parameters())
        {
            if (param instanceof SingleVariableDeclaration)
            {
                SingleVariableDeclaration vd = (SingleVariableDeclaration) param;
                String varName = vd.getName().toString();
                superInv.arguments().add(ast.newSimpleName(varName));
            }
        }
        method.getBody().statements().add(ast.newExpressionStatement(superInv));
    }

    /* (non-Javadoc)
     * @see com.motorola.studio.android.model.java.JavaClass#addComments()
     */
    @Override
    protected void addComments() throws AndroidException
    {
        ASTNode todoComment;

        ASTParser parser = ASTParser.newParser(AST.JLS3);
        parser.setSource(document.get().toCharArray());

        compUnit = (CompilationUnit) parser.createAST(null);
        ast = compUnit.getAST();
        rewrite = ASTRewrite.create(ast);

        todoComment =
                rewrite.createStringPlaceholder(CodeUtilsNLS.MODEL_Common_ToDoPutYourCodeHere,
                        ASTNode.EMPTY_STATEMENT);

        TypeDeclaration activityClass = (TypeDeclaration) compUnit.types().get(0);
        MethodDeclaration method;
        Block block;

        // Adds the Override annotation and ToDo comment to all overridden methods
        for (int i = 0; i < activityClass.bodyDeclarations().size(); i++)
        {
            method = (MethodDeclaration) activityClass.bodyDeclarations().get(i);

            // Adds the Override annotation
            rewrite.getListRewrite(method, method.getModifiersProperty()).insertFirst(
                    OVERRIDE_ANNOTATION, null);

            // Adds the ToDo comment
            block = method.getBody();
            rewrite.getListRewrite(block, Block.STATEMENTS_PROPERTY).insertLast(todoComment, null);
        }

        try
        {
            // Writes the modifications
            TextEdit modifications = rewrite.rewriteAST(document, null);
            modifications.apply(document);
        }
        catch (IllegalArgumentException e)
        {
            String errMsg =
                    NLS.bind(CodeUtilsNLS.EXC_JavaClass_ErrorApplyingCommentsToCode, className);

            StudioLogger.error(ActivityClass.class, errMsg, e);
            throw new AndroidException(errMsg);
        }
        catch (MalformedTreeException e)
        {
            String errMsg =
                    NLS.bind(CodeUtilsNLS.EXC_JavaClass_ErrorApplyingCommentsToCode, className);

            StudioLogger.error(ActivityClass.class, errMsg, e);
            throw new AndroidException(errMsg);
        }
        catch (BadLocationException e)
        {
            String errMsg =
                    NLS.bind(CodeUtilsNLS.EXC_JavaClass_ErrorApplyingCommentsToCode, className);

            StudioLogger.error(ActivityClass.class, errMsg, e);
            throw new AndroidException(errMsg);
        }
    }
}