/*******************************************************************************
* Copyright (c) 2000, 2010 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.runtime.IPath;
/**
* An entry on a Java project classpath identifying one or more package fragment
* roots. A classpath entry has a content kind (either source,
* {@link IPackageFragmentRoot#K_SOURCE}, or binary, {@link IPackageFragmentRoot#K_BINARY}), which is inherited
* by each package fragment root and package fragment associated with the entry.
* <p>
* A classpath entry can refer to any of the following:<ul>
*
* <li>Source code in the current project. In this case, the entry identifies a
* root folder in the current project containing package fragments and
* source files with one of the {@link JavaCore#getJavaLikeExtensions()
* Java-like extensions}. The root folder itself represents a default
* package, subfolders represent package fragments, and files with a
* Java-like extension (e.g. <code>.java</code> files)
* represent compilation units. All compilation units will be compiled when
* the project is built. The classpath entry must specify the
* absolute path to the root folder. Entries of this kind are
* associated with the {@link #CPE_SOURCE} constant.
* Source classpath entries can carry inclusion and exclusion patterns for
* selecting which source files appear as compilation
* units and get compiled when the project is built.
* </li>
*
* <li>A binary library in the current project, in another project, or in the external
* file system. In this case the entry identifies a JAR (or root folder) containing
* package fragments and <code>.class</code> files. The classpath entry
* must specify the absolute path to the JAR (or root folder), and in case it refers
* to an external JAR, then there is no associated resource in the workbench. Entries
* of this kind are associated with the {@link #CPE_LIBRARY} constant.</li>
*
* <li>A required project. In this case the entry identifies another project in
* the workspace. The required project is used as a binary library when compiling
* (that is, the builder looks in the output location of the required project
* for required <code>.class</code> files when building). When performing other
* "development" operations - such as code assist, code resolve, type hierarchy
* creation, etc. - the source code of the project is referred to. Thus, development
* is performed against a required project's source code, and compilation is
* performed against a required project's last built state. The
* classpath entry must specify the absolute path to the
* project. Entries of this kind are associated with the {@link #CPE_PROJECT}
* constant.
* Note: referencing a required project with a classpath entry refers to the source
* code or associated <code>.class</code> files located in its output location.
* It will also automatically include any other libraries or projects that the required project's classpath
* refers to, iff the corresponding classpath entries are tagged as being exported
* ({@link IClasspathEntry#isExported}).
* Unless exporting some classpath entries, classpaths are not chained by default -
* each project must specify its own classpath in its entirety.</li>
*
* <li> A path beginning in a classpath variable defined globally to the workspace.
* Entries of this kind are associated with the {@link #CPE_VARIABLE} constant.
* Classpath variables are created using {@link JavaCore#setClasspathVariable(String, IPath, org.eclipse.core.runtime.IProgressMonitor)},
* and gets resolved, to either a project or library entry, using
* {@link JavaCore#getResolvedClasspathEntry(IClasspathEntry)}.
* It is also possible to register an automatic initializer ({@link ClasspathVariableInitializer}),
* which will be invoked through the extension point "org.eclipse.jdt.core.classpathVariableInitializer".
* After resolution, a classpath variable entry may either correspond to a project or a library entry. </li>
*
* <li> A named classpath container identified by its container path.
* A classpath container provides a way to indirectly reference a set of classpath entries through
* a classpath entry of kind {@link #CPE_CONTAINER}. Typically, a classpath container can
* be used to describe a complex library composed of multiple JARs, projects or classpath variables,
* considering also that containers can be mapped differently on each project. Several projects can
* reference the same generic container path, but have each of them actually bound to a different
* container object.
* The container path is a formed by a first ID segment followed with extra segments,
* which can be used as additional hints for resolving this container reference. If no container was ever
* recorded for this container path onto this project (using {@link JavaCore#setClasspathContainer},
* then a {@link ClasspathContainerInitializer} will be activated if any was registered for this
* container ID onto the extension point "org.eclipse.jdt.core.classpathContainerInitializer".
* A classpath container entry can be resolved explicitly using {@link JavaCore#getClasspathContainer}
* and the resulting container entries can contain any non-container entry. In particular, it may contain variable
* entries, which in turn needs to be resolved before being directly used.
* <br> Also note that the container resolution APIs include an IJavaProject argument, so as to allow the same
* container path to be interpreted in different ways for different projects. </li>
* </ul>
* </p>
* The result of {@link IJavaProject#getResolvedClasspath} will have all entries of type
* {@link #CPE_VARIABLE} and {@link #CPE_CONTAINER} resolved to a set of
* {@link #CPE_SOURCE}, {@link #CPE_LIBRARY} or {@link #CPE_PROJECT}
* classpath entries.
* <p>
* Any classpath entry other than a source folder (kind {@link #CPE_SOURCE}) can
* be marked as being exported. Exported entries are automatically contributed to
* dependent projects, along with the project's default output folder, which is
* implicitly exported, and any auxiliary output folders specified on source
* classpath entries. The project's output folder(s) are always listed first,
* followed by the any exported entries.
* <p>
* Classpath entries can be created via methods on {@link JavaCore}.
* </p>
*
* @see JavaCore#newLibraryEntry(org.eclipse.core.runtime.IPath, org.eclipse.core.runtime.IPath, org.eclipse.core.runtime.IPath)
* @see JavaCore#newProjectEntry(org.eclipse.core.runtime.IPath)
* @see JavaCore#newSourceEntry(org.eclipse.core.runtime.IPath)
* @see JavaCore#newVariableEntry(org.eclipse.core.runtime.IPath, org.eclipse.core.runtime.IPath, org.eclipse.core.runtime.IPath)
* @see JavaCore#newContainerEntry(org.eclipse.core.runtime.IPath)
* @see ClasspathVariableInitializer
* @see ClasspathContainerInitializer
* @noimplement This interface is not intended to be implemented by clients.
*/
public interface IClasspathEntry {
/**
* Entry kind constant describing a classpath entry identifying a
* library. A library is a folder or JAR containing package
* fragments consisting of pre-compiled binaries.
*/
int CPE_LIBRARY = 1;
/**
* Entry kind constant describing a classpath entry identifying a
* required project.
*/
int CPE_PROJECT = 2;
/**
* Entry kind constant describing a classpath entry identifying a
* folder containing package fragments with source code
* to be compiled.
*/
int CPE_SOURCE = 3;
/**
* Entry kind constant describing a classpath entry defined using
* a path that begins with a classpath variable reference.
*/
int CPE_VARIABLE = 4;
/**
* Entry kind constant describing a classpath entry representing
* a name classpath container.
*
* @since 2.0
*/
int CPE_CONTAINER = 5;
/**
* Returns whether the access rules of the project's exported entries should be combined with this entry's access rules.
* Returns true for container entries.
* Returns false otherwise.
*
* @return whether the access rules of the project's exported entries should be combined with this entry's access rules
* @since 3.1
*/
boolean combineAccessRules();
/**
* Returns the possibly empty list of access rules for this entry.
*
* @return the possibly empty list of access rules for this entry
* @since 3.1
*/
IAccessRule[] getAccessRules();
/**
* Returns the kind of files found in the package fragments identified by this
* classpath entry.
*
* @return {@link IPackageFragmentRoot#K_SOURCE} for files containing
* source code, and {@link IPackageFragmentRoot#K_BINARY} for binary
* class files.
* There is no specified value for an entry denoting a variable ({@link #CPE_VARIABLE})
* or a classpath container ({@link #CPE_CONTAINER}).
*/
int getContentKind();
/**
* Returns the kind of this classpath entry.
*
* @return one of:
* <ul>
* <li>{@link #CPE_SOURCE} - this entry describes a source root in
its project
* <li>{@link #CPE_LIBRARY} - this entry describes a folder or JAR
containing binaries
* <li>{@link #CPE_PROJECT} - this entry describes another project
*
* <li>{@link #CPE_VARIABLE} - this entry describes a project or library
* indirectly via a classpath variable in the first segment of the path
* *
* <li>{@link #CPE_CONTAINER} - this entry describes set of entries
* referenced indirectly via a classpath container
* </ul>
*/
int getEntryKind();
/**
* Returns the set of patterns used to exclude resources or classes associated with
* this classpath entry.
* <p>
* For source classpath entries,
* exclusion patterns allow specified portions of the resource tree rooted
* at this source entry's path to be filtered out. If no exclusion patterns
* are specified, this source entry includes all relevent files. Each path
* specified must be a relative path, and will be interpreted relative
* to this source entry's path. File patterns are case-sensitive. A file
* matched by one or more of these patterns is excluded from the
* corresponding package fragment root.
* Exclusion patterns have higher precedence than inclusion patterns;
* in other words, exclusion patterns can remove files for the ones that
* are to be included, not the other way around.
* </p>
* <p>
* Note that there is no need to supply a pattern to exclude ".class" files
* because a source entry filters these out automatically.
* </p>
* <p>
* The pattern mechanism is similar to Ant's. Each pattern is represented as
* a relative path. The path segments can be regular file or folder names or simple patterns
* involving standard wildcard characters.
* </p>
* <p>
* '*' matches 0 or more characters within a segment. So
* <code>*.java</code> matches <code>.java</code>, <code>a.java</code>
* and <code>Foo.java</code>, but not <code>Foo.properties</code>
* (does not end with <code>.java</code>).
* </p>
* <p>
* '?' matches 1 character within a segment. So <code>?.java</code>
* matches <code>a.java</code>, <code>A.java</code>,
* but not <code>.java</code> or <code>xyz.java</code> (neither have
* just one character before <code>.java</code>).
* </p>
* <p>
* Combinations of *'s and ?'s are allowed.
* </p>
* <p>
* The special pattern '**' matches zero or more segments. In a source entry,
* a path like <code>tests/</code> that ends in a trailing separator is interpreted
* as <code>tests/**</code>, and would match everything under
* the folder named <code>tests</code>.
* </p>
* <p>
* Example patterns in source entries (assuming that "java" is the only {@link JavaCore#getJavaLikeExtensions() Java-like extension}):
* <ul>
* <li>
* <code>tests/**</code> (or simply <code>tests/</code>)
* matches all files under a root folder
* named <code>tests</code>. This includes <code>tests/Foo.java</code>
* and <code>tests/com/example/Foo.java</code>, but not
* <code>com/example/tests/Foo.java</code> (not under a root folder named
* <code>tests</code>).
* </li>
* <li>
* <code>tests/*</code> matches all files directly below a root
* folder named <code>tests</code>. This includes <code>tests/Foo.java</code>
* and <code>tests/FooHelp.java</code>
* but not <code>tests/com/example/Foo.java</code> (not directly under
* a folder named <code>tests</code>) or
* <code>com/Foo.java</code> (not under a folder named <code>tests</code>).
* </li>
* <li>
* <code>**/tests/**</code> matches all files under any
* folder named <code>tests</code>. This includes <code>tests/Foo.java</code>,
* <code>com/examples/tests/Foo.java</code>, and
* <code>com/examples/tests/unit/Foo.java</code>, but not
* <code>com/example/Foo.java</code> (not under a folder named
* <code>tests</code>).
* </li>
* </ul>
* </p>
*
* @return the possibly empty list of resource exclusion patterns
* associated with this classpath entry, or <code>null</code> if this kind
* of classpath entry does not support exclusion patterns
* @since 2.1
*/
IPath[] getExclusionPatterns();
/**
* Returns the extra classpath attributes for this classpath entry. Returns an empty array if this entry
* has no extra attributes.
*
* @return the possibly empty list of extra classpath attributes for this classpath entry
* @since 3.1
*/
IClasspathAttribute[] getExtraAttributes();
/**
* Returns the set of patterns used to explicitly define resources or classes
* to be included with this classpath entry.
* <p>
* For source classpath entries,
* when no inclusion patterns are specified, the source entry includes all
* relevent files in the resource tree rooted at this source entry's path.
* Specifying one or more inclusion patterns means that only the specified
* portions of the resource tree are to be included. Each path specified
* must be a relative path, and will be interpreted relative to this source
* entry's path. File patterns are case-sensitive. A file matched by one or
* more of these patterns is included in the corresponding package fragment
* root unless it is excluded by one or more of this entrie's exclusion
* patterns. Exclusion patterns have higher precedence than inclusion
* patterns; in other words, exclusion patterns can remove files for the
* ones that are to be included, not the other way around.
* </p>
* <p>
* See {@link #getExclusionPatterns()} for a discussion of the syntax and
* semantics of path patterns. The absence of any inclusion patterns is
* semantically equivalent to the explicit inclusion pattern
* <code>**</code>.
* </p>
* <p>
* Example patterns in source entries:
* <ul>
* <li>
* The inclusion pattern <code>src/**</code> by itself includes all
* files under a root folder named <code>src</code>.
* </li>
* <li>
* The inclusion patterns <code>src/**</code> and
* <code>tests/**</code> includes all files under the root folders
* named <code>src</code> and <code>tests</code>.
* </li>
* <li>
* The inclusion pattern <code>src/**</code> together with the
* exclusion pattern <code>src/**/Foo.java</code> includes all
* files under a root folder named <code>src</code> except for ones
* named <code>Foo.java</code>.
* </li>
* </ul>
* </p>
*
* @return the possibly empty list of resource inclusion patterns
* associated with this classpath entry, or <code>null</code> if this kind
* of classpath entry does not support inclusion patterns
* @since 3.0
*/
IPath[] getInclusionPatterns();
/**
* Returns the full path to the specific location where the builder writes
* <code>.class</code> files generated for this source entry
* (entry kind {@link #CPE_SOURCE}).
* <p>
* Source entries can optionally be associated with a specific output location.
* If none is provided, the source entry will be implicitly associated with its project
* default output location (see {@link IJavaProject#getOutputLocation}).
* </p><p>
* NOTE: A specific output location cannot coincidate with another source/library entry.
* </p>
*
* @return the full path to the specific location where the builder writes
* <code>.class</code> files for this source entry, or <code>null</code>
* if using default output folder
* @since 2.1
*/
IPath getOutputLocation();
/**
* Returns the path of this classpath entry.
*
* The meaning of the path of a classpath entry depends on its entry kind:<ul>
* <li>Source code in the current project ({@link #CPE_SOURCE}) -
* The path associated with this entry is the absolute path to the root folder. </li>
* <li>A binary library in the current project ({@link #CPE_LIBRARY}) - the path
* associated with this entry is the absolute path to the JAR (or root folder), and
* in case it refers to an external library, then there is no associated resource in
* the workbench.
* <li>A required project ({@link #CPE_PROJECT}) - the path of the entry denotes the
* path to the corresponding project resource.</li>
* <li>A variable entry ({@link #CPE_VARIABLE}) - the first segment of the path
* is the name of a classpath variable. If this classpath variable
* is bound to the path <i>P</i>, the path of the corresponding classpath entry
* is computed by appending to <i>P</i> the segments of the returned
* path without the variable.</li>
* <li> A container entry ({@link #CPE_CONTAINER}) - the path of the entry
* is the name of the classpath container, which can be bound indirectly to a set of classpath
* entries after resolution. The containerPath is a formed by a first ID segment followed with
* extra segments that can be used as additional hints for resolving this container
* reference (also see {@link IClasspathContainer}).
* </li>
* </ul>
*
* @return the path of this classpath entry
*/
IPath getPath();
/**
* Returns the path to the source archive or folder associated with this
* classpath entry, or <code>null</code> if this classpath entry has no
* source attachment.
* <p>
* Only library and variable classpath entries may have source attachments.
* For library classpath entries, the result path (if present) locates a source
* archive or folder. This archive or folder can be located in a project of the
* workspace or outside the workspace. For variable classpath entries, the
* result path (if present) has an analogous form and meaning as the
* variable path, namely the first segment is the name of a classpath variable.
* </p>
*
* @return the path to the source archive or folder, or <code>null</code> if none
*/
IPath getSourceAttachmentPath();
/**
* Returns the path within the source archive or folder where package fragments
* are located. An empty path indicates that packages are located at
* the root of the source archive or folder. Returns a non-<code>null</code> value
* if and only if {@link #getSourceAttachmentPath} returns
* a non-<code>null</code> value.
*
* @return the path within the source archive or folder, or <code>null</code> if
* not applicable
*/
IPath getSourceAttachmentRootPath();
/**
* Returns the classpath entry that is making a reference to this classpath entry. For entry kinds
* {@link #CPE_LIBRARY}, the return value is the entry that is representing the JAR that includes
* <code>this</code> in the MANIFEST.MF file's Class-Path section. For entry kinds other than
* {@link #CPE_LIBRARY}, this returns <code>null</code>. For those entries that are on the raw classpath already,
* this returns <code>null</code>.
* <p>
* It is possible that multiple library entries refer to the same entry
* via the MANIFEST.MF file. In those cases, this method returns the first classpath entry
* that appears in the raw classpath. However, this does not mean that the other referencing
* entries do not relate to their referenced entries.
* See {@link JavaCore#getReferencedClasspathEntries(IClasspathEntry, IJavaProject)} for
* more details.
* </p>
*
* @return the classpath entry that is referencing this entry or <code>null</code> if
* not applicable.
* @since 3.6
*/
IClasspathEntry getReferencingEntry();
/**
* Returns whether this entry is exported to dependent projects.
* Always returns <code>false</code> for source entries (kind
* {@link #CPE_SOURCE}), which cannot be exported.
*
* @return <code>true</code> if exported, and <code>false</code> otherwise
* @since 2.0
*/
boolean isExported();
/**
* This is a helper method, which returns the resolved classpath entry denoted
* by an entry (if it is a variable entry). It is obtained by resolving the variable
* reference in the first segment. Returns <code>null</code> if unable to resolve using
* the following algorithm:
* <ul>
* <li> if variable segment cannot be resolved, returns <code>null</code></li>
* <li> finds a project, JAR or binary folder in the workspace at the resolved path location</li>
* <li> if none finds an external JAR file or folder outside the workspace at the resolved path location </li>
* <li> if none returns <code>null</code></li>
* </ul>
* <p>
* Variable source attachment is also resolved and recorded in the resulting classpath entry.
* <p>
* @return the resolved library or project classpath entry, or <code>null</code>
* if the given path could not be resolved to a classpath entry
* <p>
* Note that this deprecated API doesn't handle CPE_CONTAINER entries.
*
* @deprecated Use {@link JavaCore#getResolvedClasspathEntry(IClasspathEntry)} instead
*/
IClasspathEntry getResolvedEntry();
}