/*******************************************************************************
* Copyright (c) 2000, 2008 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
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.core;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.jobs.ISchedulingRule;
/**
* Common protocol for all elements provided by the Java model.
* Java model elements are exposed to clients as handles to the actual underlying element.
* The Java 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>JavaModelException</code> when an underlying element is missing.
* <code>JavaModelException.isDoesNotExist</code> can be used to recognize
* this common special case.
* </p>
* @noimplement This interface is not intended to be implemented by clients.
*/
public interface IJavaElement extends IAdaptable {
/**
* Constant representing a Java model (workspace level object).
* A Java element with this type can be safely cast to {@link IJavaModel}.
*/
int JAVA_MODEL = 1;
/**
* Constant representing a Java project.
* A Java element with this type can be safely cast to {@link IJavaProject}.
*/
int JAVA_PROJECT = 2;
/**
* Constant representing a package fragment root.
* A Java element with this type can be safely cast to {@link IPackageFragmentRoot}.
*/
int PACKAGE_FRAGMENT_ROOT = 3;
/**
* Constant representing a package fragment.
* A Java element with this type can be safely cast to {@link IPackageFragment}.
*/
int PACKAGE_FRAGMENT = 4;
/**
* Constant representing a Java compilation unit.
* A Java element with this type can be safely cast to {@link ICompilationUnit}.
*/
int COMPILATION_UNIT = 5;
/**
* Constant representing a class file.
* A Java element with this type can be safely cast to {@link IClassFile}.
*/
int CLASS_FILE = 6;
/**
* Constant representing a type (a class or interface).
* A Java element with this type can be safely cast to {@link IType}.
*/
int TYPE = 7;
/**
* Constant representing a field.
* A Java element with this type can be safely cast to {@link IField}.
*/
int FIELD = 8;
/**
* Constant representing a method or constructor.
* A Java element with this type can be safely cast to {@link IMethod}.
*/
int METHOD = 9;
/**
* Constant representing a stand-alone instance or class initializer.
* A Java element with this type can be safely cast to {@link IInitializer}.
*/
int INITIALIZER = 10;
/**
* Constant representing a package declaration within a compilation unit.
* A Java element with this type can be safely cast to {@link IPackageDeclaration}.
*/
int PACKAGE_DECLARATION = 11;
/**
* Constant representing all import declarations within a compilation unit.
* A Java element with this type can be safely cast to {@link IImportContainer}.
*/
int IMPORT_CONTAINER = 12;
/**
* Constant representing an import declaration within a compilation unit.
* A Java element with this type can be safely cast to {@link IImportDeclaration}.
*/
int IMPORT_DECLARATION = 13;
/**
* Constant representing a local variable declaration.
* A Java element with this type can be safely cast to {@link ILocalVariable}.
* @since 3.0
*/
int LOCAL_VARIABLE = 14;
/**
* Constant representing a type parameter declaration.
* A Java element with this type can be safely cast to {@link ITypeParameter}.
* @since 3.1
*/
int TYPE_PARAMETER = 15;
/**
* Constant representing an annotation.
* A Java element with this type can be safely cast to {@link IAnnotation}.
* @since 3.4
*/
int ANNOTATION = 16;
/**
* Returns whether this Java element exists in the model.
* <p>
* Java elements are handle objects that may or may not be backed by an
* actual element. Java elements that are backed by an actual element are
* said to "exist", and this method returns <code>true</code>. For Java
* 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 Java element from the root of the Java model
* along a chain of existing Java elements. On the other hand, working
* copies are said to exist until they are destroyed (with
* <code>IWorkingCopy.destroy</code>). Unlike regular Java 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 Java model, and
* <code>false</code> if this element does not exist
*/
boolean exists();
/**
* Returns the first ancestor of this Java 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 Java element that has the given type, null if no such an ancestor can be found
* @since 2.0
*/
IJavaElement getAncestor(int ancestorType);
/**
* <p>Returns the Javadoc as an html source if this element has an attached javadoc,
* null otherwise.</p>
* <p>This should be used only for binary elements. Source elements will always return null.</p>
* <p>The encoding used to read the javadoc is the one defined by the content type of the
* file. If none is defined, then the project's encoding of this java element is used. If the project's
* encoding cannot be retrieved, then the platform encoding is used.</p>
* <p>In case of the javadoc doesn't exist for this element, null is returned.</p>
*
* <p>The html is extracted from the attached javadoc and provided as is. No
* transformation or validation is done.</p>
*
* @param monitor the given progress monitor
* @exception JavaModelException if:<ul>
* <li>this element does not exist</li>
* <li>retrieving the attached javadoc fails (timed-out, invalid URL, ...)</li>
* <li>the format of the javadoc doesn't match expected standards (different anchors,...)</li>
* </ul>
* @return the extracted javadoc from the attached javadoc, null if none
* @see IClasspathAttribute#JAVADOC_LOCATION_ATTRIBUTE_NAME
* @since 3.2
*/
String getAttachedJavadoc(IProgressMonitor monitor) throws JavaModelException;
/**
* 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>ICompilationUnit</code>
* is its underlying <code>IFile</code>. The corresponding resource for
* an <code>IPackageFragment</code> that is not contained in an archive
* is its underlying <code>IFolder</code>. An <code>IPackageFragment</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 JavaModelException if this element does not exist or if an
* exception occurs while accessing its corresponding resource
*/
IResource getCorrespondingResource() throws JavaModelException;
/**
* Returns the name of this element. This is a handle-only method.
*
* @return the element name
*/
String getElementName();
/**
* 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>IJavaElement</code>
* @see IJavaElement
*/
int getElementType();
/**
* 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>JavaCore.create(String)</code> method.
*
* @return the string handle identifier
* @see JavaCore#create(java.lang.String)
*/
String getHandleIdentifier();
/**
* Returns the Java model.
* This is a handle-only method.
*
* @return the Java model
*/
IJavaModel getJavaModel();
/**
* Returns the Java project this element is contained in,
* or <code>null</code> if this element is not contained in any Java project
* (for instance, the <code>IJavaModel</code> is not contained in any Java
* project).
* This is a handle-only method.
*
* @return the containing Java project, or <code>null</code> if this element is
* not contained in a Java project
*/
IJavaProject getJavaProject();
/**
* 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.
* @since 2.0
*/
IOpenable getOpenable();
/**
* 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
*/
IJavaElement getParent();
/**
* Returns the path to the innermost resource enclosing this element.
* If this element is not included in an external library,
* the path returned is the full, absolute path to the underlying resource,
* relative to the workbench.
* If this element is included in an external library,
* the path returned is the absolute path to the archive or to the
* folder in the file system.
* This is a handle-only method.
*
* @return the path to the innermost resource enclosing this element
* @since 2.0
*/
IPath getPath();
/**
* 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.
* @since 3.0
*/
IJavaElement getPrimaryElement();
/**
* 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 library, <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
* @since 2.0
*/
IResource getResource();
/**
* Returns the scheduling rule associated with this Java element.
* This is a handle-only method.
*
* @return the scheduling rule associated with this Java element
* @since 3.0
*/
ISchedulingRule getSchedulingRule();
/**
* 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 JavaModelException if this element does not exist or if an
* exception occurs while accessing its underlying resource
*/
IResource getUnderlyingResource() throws JavaModelException;
/**
* Returns whether this Java element is read-only. An element is read-only
* if its structure cannot be modified by the java model.
* <p>
* Note this is different from IResource.isReadOnly(). For example, .jar
* files are read-only as the java 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 whether the structure of this element is known. For example, for a
* compilation unit that has syntax errors, <code>false</code> is returned.
* If the structure of an element is unknown, navigations will return reasonable
* defaults. For example, <code>getChildren</code> for a compilation unit with
* syntax errors will return a collection of the children that could be parsed.
* <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 JavaModelException 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 JavaModelException;
}