| /******************************************************************************* |
| * Copyright (c) 2005, 2007 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| |
| *******************************************************************************/ |
| package org.eclipse.dltk.core; |
| |
| import org.eclipse.core.resources.IResource; |
| import org.eclipse.core.runtime.IAdaptable; |
| import org.eclipse.core.runtime.IPath; |
| |
| |
| |
| /** |
| * Common protocol for all elements provided by the script model. |
| * Script model elements are exposed to clients as handles to the actual underlying element. |
| * The model may hand out any number of handles for each element. Handles |
| * that refer to the same element are guaranteed to be equal, but not necessarily identical. |
| * <p> |
| * Methods annotated as "handle-only" do not require underlying elements to exist. |
| * Methods that require underlying elements to exist throw |
| * a <code>ModelException</code> when an underlying element is missing. |
| * <code>ModelException.isDoesNotExist</code> can be used to recognize |
| * this common special case. |
| * </p> |
| * <p> |
| * This interface is not intended to be implemented by clients. |
| * </p> |
| */ |
| public interface IModelElement extends IAdaptable { |
| |
| /** |
| * Constant representing a script model (workspace level object). |
| * An element with this type can be safely cast to <code>IModel</code>. |
| */ |
| int SCRIPT_MODEL = 1; |
| |
| /** |
| * Constant representing a script project. |
| * An element with this type can be safely cast to <code>IScriptProject</code>. |
| */ |
| int SCRIPT_PROJECT = 2; |
| |
| /** |
| * Constant representing a project fragment. |
| * An element with this type can be safely cast to <code>IProjectFragment</code>. |
| */ |
| int PROJECT_FRAGMENT = 3; |
| |
| /** |
| * Constant representing a folder. |
| * An element with this type can be safely cast to <code>ISourceFolder</code>. |
| */ |
| int SCRIPT_FOLDER = 4; |
| |
| /** |
| * Constant representing a source module. |
| * An element with this type can be safely cast to <code>ISourceModule</code>. |
| */ |
| int SOURCE_MODULE = 5; |
| |
| /** |
| * Constant representing a binary module. |
| * An element with this type can be safely cast to <code>IBinaryModule</code>. |
| */ |
| int BINARY_MODULE = 6; |
| |
| /** |
| * Constant representing a type (a class or interface). |
| * An element with this type can be safely cast to <code>IType</code>. |
| */ |
| int TYPE = 7; |
| |
| /** |
| * Constant representing a field or variable. |
| * An element with this type can be safely cast to <code>IField</code>. |
| */ |
| int FIELD = 8; |
| |
| /** |
| * Constant representing a method or procedure. |
| * An element with this type can be safely cast to <code>IMethod</code>. |
| */ |
| int METHOD = 9; |
| |
| /** |
| * Constant representing a package declaration within a compilation unit. |
| * A model element with this type can be safely cast to <code>IPackageDeclaration</code>. |
| */ |
| int PACKAGE_DECLARATION = 10; |
| |
| |
| /** |
| * Returns this element's kind encoded as an integer. |
| * This is a handle-only method. |
| * |
| * @return the kind of element; one of the constants declared in |
| * <code>IModelElement</code> |
| */ |
| int getElementType(); |
| |
| /** |
| * Returns the name of this element. This is a handle-only method. |
| * |
| * @return the element name |
| */ |
| String getElementName(); |
| |
| /** |
| * Returns the element directly containing this element, |
| * or <code>null</code> if this element has no parent. |
| * This is a handle-only method. |
| * |
| * @return the parent element, or <code>null</code> if this element has no parent |
| */ |
| IModelElement getParent(); |
| |
| /** |
| * Returns whether this element is read-only. An element is read-only |
| * if its structure cannot be modified by the model. |
| * <p> |
| * Note this is different from IResource.isReadOnly(). For example, .zip |
| * files are read-only as the model doesn't know how to add/remove |
| * elements in this file, but the underlying IFile can be writable. |
| * <p> |
| * This is a handle-only method. |
| * |
| * @return <code>true</code> if this element is read-only |
| */ |
| boolean isReadOnly(); |
| |
| /** |
| * Returns the innermost resource enclosing this element. |
| * If this element is included in an archive and this archive is not external, |
| * this is the underlying resource corresponding to the archive. |
| * If this element is included in an external archive, <code>null</code> |
| * is returned. |
| * This is a handle-only method. |
| * |
| * @return the innermost resource enclosing this element, <code>null</code> if this |
| * element is included in an external archive |
| */ |
| IResource getResource(); |
| |
| /** |
| * Returns the path to the innermost resource enclosing this element. |
| * If this element is not included in an external archive, |
| * the path returned is the full, absolute path to the underlying resource, |
| * relative to the workbench. |
| * If this element is included in an external archive, |
| * the path returned is the absolute path to the archive in the file system. |
| * This is a handle-only method. |
| * |
| * @return the path to the innermost resource enclosing this element |
| */ |
| IPath getPath(); |
| |
| /** |
| * Returns whether this element exists in the model. |
| * <p> |
| * Model elements are handle objects that may or may not be backed by an |
| * actual element. Model elements that are backed by an actual element are |
| * said to "exist", and this method returns <code>true</code>. For Model |
| * elements that are not working copies, it is always the case that if the |
| * element exists, then its parent also exists (provided it has one) and |
| * includes the element as one of its children. It is therefore possible |
| * to navigated to any existing model element from the root of the model |
| * along a chain of existing model elements. On the other hand, working |
| * copies are said to exist until they are destroyed (with |
| * <code>IWorkingCopy.destroy</code>). Unlike regular model elements, a |
| * working copy never shows up among the children of its parent element |
| * (which may or may not exist). |
| * </p> |
| * |
| * @return <code>true</code> if this element exists in the model, and |
| * <code>false</code> if this element does not exist |
| */ |
| boolean exists(); |
| |
| /** |
| * Returns the first ancestor of this script element that has the given type. |
| * Returns <code>null</code> if no such an ancestor can be found. |
| * This is a handle-only method. |
| * |
| * @param ancestorType the given type |
| * @return the first ancestor of this script element that has the given type, null if no such an ancestor can be found |
| * |
| */ |
| IModelElement getAncestor(int ancestorType); |
| |
| /** |
| * Returns the first openable parent. If this element is openable, the element |
| * itself is returned. Returns <code>null</code> if this element doesn't have |
| * an openable parent. |
| * This is a handle-only method. |
| * |
| * @return the first openable parent or <code>null</code> if this element doesn't have |
| * an openable parent. |
| */ |
| IOpenable getOpenable(); |
| |
| /** |
| * Returns the script model. |
| * This is a handle-only method. |
| * |
| * @return the script model |
| */ |
| IScriptModel getModel(); |
| |
| /** |
| * Returns the Script project this element is contained in, |
| * or <code>null</code> if this element is not contained in any script project |
| * (for instance, the <code>IScriptModel</code> is not contained in any Script |
| * project). |
| * This is a handle-only method. |
| * |
| * @return the containing Script project, or <code>null</code> if this element is |
| * not contained in a Script project |
| */ |
| IDLTKProject getScriptProject(); |
| |
| /** |
| * Returns the smallest underlying resource that contains |
| * this element, or <code>null</code> if this element is not contained |
| * in a resource. |
| * |
| * @return the underlying resource, or <code>null</code> if none |
| * @exception ModelException if this element does not exist or if an |
| * exception occurs while accessing its underlying resource |
| */ |
| IResource getUnderlyingResource() throws ModelException; |
| /** |
| * Returns the resource that corresponds directly to this element, |
| * or <code>null</code> if there is no resource that corresponds to |
| * this element. |
| * <p> |
| * For example, the corresponding resource for an <code>ISourceModule</code> |
| * is its underlying <code>IFile</code>. The corresponding resource for |
| * an <code>IScriptFolder</code> that is not contained in an archive |
| * is its underlying <code>IFolder</code>. An <code>IScriptFolder</code> |
| * contained in an archive has no corresponding resource. Similarly, there |
| * are no corresponding resources for <code>IMethods</code>, |
| * <code>IFields</code>, etc. |
| * <p> |
| * |
| * @return the corresponding resource, or <code>null</code> if none |
| * @exception ModelException if this element does not exist or if an |
| * exception occurs while accessing its corresponding resource |
| */ |
| IResource getCorrespondingResource() throws ModelException; |
| |
| /** |
| * Returns the primary element (whose compilation unit is the primary compilation unit) |
| * this working copy element was created from, or this element if it is a descendant of a |
| * primary compilation unit or if it is not a descendant of a working copy (e.g. it is a |
| * binary member). |
| * The returned element may or may not exist. |
| * |
| * @return the primary element this working copy element was created from, or this |
| * element. |
| * |
| */ |
| IModelElement getPrimaryElement(); |
| |
| /** |
| * Returns a string representation of this element handle. The format of |
| * the string is not specified; however, the identifier is stable across |
| * workspace sessions, and can be used to recreate this handle via the |
| * <code>DLTKCore.create(String)</code> method. |
| * |
| * @return the string handle identifier |
| * @see DLTKCore#create(java.lang.String) |
| */ |
| String getHandleIdentifier(); |
| |
| /** |
| * Returns whether the structure of this element is known. For example, for a |
| * soure module that could not be parsed, <code>false</code> is returned. |
| * If the structure of an element is unknown, navigations will return reasonable |
| * defaults. For example, <code>getChildren</code> will return an empty collection. |
| * <p> |
| * Note: This does not imply anything about consistency with the |
| * underlying resource/buffer contents. |
| * </p> |
| * |
| * @return <code>true</code> if the structure of this element is known |
| * @exception ScriptModelException if this element does not exist or if an |
| * exception occurs while accessing its corresponding resource |
| */// TODO (philippe) predicate shouldn't throw an exception |
| boolean isStructureKnown() throws ModelException; |
| |
| void accept( IModelElementVisitor visitor ) throws ModelException; |
| } |