CompletionProposal.java
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/*******************************************************************************
* Copyright (c) 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package net.sourceforge.phpdt.core;
import net.sourceforge.phpdt.core.compiler.CharOperation;
import org.eclipse.core.runtime.IProgressMonitor;
/**
* Completion proposal.
* <p>
* In typical usage, the user working in a Java code editor issues a code assist
* command. This command results in a call to
* <code>ICodeAssist.codeComplete(position, completionRequestor)</code>
* passing the current position in the source code. The code assist engine
* analyzes the code in the buffer, determines what kind of Java language
* construct is at that position, and proposes ways to complete that construct.
* These proposals are instances of subclasses of
* <code>CompletionProposal</code>. These proposals, perhaps after sorting
* and filtering, are presented to the user to make a choice.
* </p>
* <p>
* The proposal is as follows: insert the
* {@linkplain #getCompletion() completion string} into the source file buffer,
* replacing the characters between {@linkplain #getReplaceStart() the start}
* and {@linkplain #getReplaceEnd() end}. The string can be arbitrary; for
* example, it might include not only the name of a method but a set of
* parentheses. Moreover, the source range may include source positions before
* or after the source position where <code>ICodeAssist.codeComplete</code>
* was invoked. The rest of the information associated with the proposal is to
* provide context that may help a user to choose from among competing
* proposals.
* </p>
* <p>
* The completion engine creates instances of this class; it is not intended to
* be used by other clients.
* </p>
*
* @see ICodeAssist#codeComplete(int, CompletionRequestor)
* @since 3.0
*/
public final class CompletionProposal {
/**
* Completion is a declaration of an anonymous class. This kind of
* completion might occur in a context like <code>"new List^;"</code> and
* complete it to <code>"new List() {}"</code>.
* <p>
* The following additional context information is available for this kind
* of completion proposal at little extra cost:
* <ul>
* <li>{@link #getDeclarationSignature()} - the type signature of the type
* being implemented or subclassed </li>
* </li>
* <li>{@link #getSignature()} - the method signature of the constructor
* that is referenced </li>
* <li>{@link #getFlags()} - the modifiers flags of the constructor that is
* referenced </li>
* </ul>
* </p>
*
* @see #getKind()
*/
public static final int ANONYMOUS_CLASS_DECLARATION = 1;
/**
* Completion is a reference to a field. This kind of completion might occur
* in a context like <code>"this.ref^ = 0;"</code> and complete it to
* <code>"this.refcount = 0;"</code>.
* <p>
* The following additional context information is available for this kind
* of completion proposal at little extra cost:
* <ul>
* <li>{@link #getDeclarationSignature()} - the type signature of the type
* that declares the field that is referenced </li>
* <li>{@link #getFlags()} - the modifiers flags (including ACC_ENUM) of
* the field that is referenced </li>
* <li>{@link #getName()} - the simple name of the field that is referenced
* </li>
* <li>{@link #getSignature()} - the type signature of the field's type (as
* opposed to the signature of the type in which the referenced field is
* declared) </li>
* </ul>
* </p>
*
* @see #getKind()
*/
public static final int FIELD_REF = 2;
/**
* Completion is a keyword. This kind of completion might occur in a context
* like <code>"public cl^ Foo {}"</code> and complete it to
* <code>"public class Foo {}"</code>.
* <p>
* The following additional context information is available for this kind
* of completion proposal at little extra cost:
* <ul>
* <li>{@link #getName()} - the keyword token </li>
* <li>{@link #getFlags()} - the corresponding modifier flags if the
* keyword is a modifier </li>
* </ul>
* </p>
*
* @see #getKind()
*/
public static final int KEYWORD = 3;
/**
* Completion is a reference to a label. This kind of completion might occur
* in a context like <code>"break lo^;"</code> and complete it to
* <code>"break loop;"</code>.
* <p>
* The following additional context information is available for this kind
* of completion proposal at little extra cost:
* <ul>
* <li>{@link #getName()} - the simple name of the label that is referenced
* </li>
* </ul>
* </p>
*
* @see #getKind()
*/
public static final int LABEL_REF = 4;
/**
* Completion is a reference to a local variable. This kind of completion
* might occur in a context like <code>"ke^ = 4;"</code> and complete it
* to <code>"keys = 4;"</code>.
* <p>
* The following additional context information is available for this kind
* of completion proposal at little extra cost:
* <ul>
* <li>{@link #getFlags()} - the modifiers flags of the local variable that
* is referenced </li>
* <li>{@link #getName()} - the simple name of the local variable that is
* referenced </li>
* <li>{@link #getSignature()} - the type signature of the local variable's
* type </li>
* </ul>
* </p>
*
* @see #getKind()
*/
public static final int LOCAL_VARIABLE_REF = 5;
/**
* Completion is a reference to a method. This kind of completion might
* occur in a context like <code>"System.out.pr^();"</code> and complete
* it to <code>""System.out.println();"</code>.
* <p>
* The following additional context information is available for this kind
* of completion proposal at little extra cost:
* <ul>
* <li>{@link #getDeclarationSignature()} - the type signature of the type
* that declares the method that is referenced </li>
* <li>{@link #getFlags()} - the modifiers flags of the method that is
* referenced </li>
* <li>{@link #getName()} - the simple name of the method that is
* referenced </li>
* <li>{@link #getSignature()} - the method signature of the method that is
* referenced </li>
* </ul>
* </p>
*
* @see #getKind()
*/
public static final int METHOD_REF = 6;
/**
* Completion is a declaration of a method. This kind of completion might
* occur in a context like <code>"new List() {si^};"</code> and complete
* it to <code>"new List() {public int size() {} };"</code>.
* <p>
* The following additional context information is available for this kind
* of completion proposal at little extra cost:
* <ul>
* <li>{@link #getDeclarationSignature()} - the type signature of the type
* that declares the method that is being overridden or implemented </li>
* <li>{@link #getName()} - the simple name of the method that is being
* overridden or implemented </li>
* <li>{@link #getSignature()} - the method signature of the method that is
* being overridden or implemented </li>
* <li>{@link #getFlags()} - the modifiers flags of the method that is
* being overridden or implemented </li>
* </ul>
* </p>
*
* @see #getKind()
*/
public static final int METHOD_DECLARATION = 7;
/**
* Completion is a reference to a package. This kind of completion might
* occur in a context like <code>"import java.u^.*;"</code> and complete
* it to <code>"import java.util.*;"</code>.
* <p>
* The following additional context information is available for this kind
* of completion proposal at little extra cost:
* <ul>
* <li>{@link #getDeclarationSignature()} - the dot-based package signature
* of the package that is referenced </li>
* </ul>
* </p>
*
* @see #getKind()
*/
public static final int PACKAGE_REF = 8;
/**
* Completion is a reference to a type. Any kind of type is allowed,
* including primitive types, reference types, array types, parameterized
* types, and type variables. This kind of completion might occur in a
* context like <code>"public static Str^ key;"</code> and complete it to
* <code>"public static String key;"</code>.
* <p>
* The following additional context information is available for this kind
* of completion proposal at little extra cost:
* <ul>
* <li>{@link #getDeclarationSignature()} - the dot-based package signature
* of the package that contains the type that is referenced </li>
* <li>{@link #getSignature()} - the type signature of the type that is
* referenced </li>
* <li>{@link #getFlags()} - the modifiers flags (including
* Flags.AccInterface, AccEnum, and AccAnnotation) of the type that is
* referenced </li>
* </ul>
* </p>
*
* @see #getKind()
*/
public static final int TYPE_REF = 9;
/**
* Completion is a declaration of a variable (locals, parameters, fields,
* etc.).
* <p>
* The following additional context information is available for this kind
* of completion proposal at little extra cost:
* <ul>
* <li>{@link #getName()} - the simple name of the variable being declared
* </li>
* <li>{@link #getSignature()} - the type signature of the type of the
* variable being declared </li>
* <li>{@link #getFlags()} - the modifiers flags of the variable being
* declared </li>
* </ul>
* </p>
*
* @see #getKind()
*/
public static final int VARIABLE_DECLARATION = 10;
/**
* Kind of completion request.
*/
private int completionKind;
/**
* Offset in original buffer where ICodeAssist.codeComplete() was requested.
*/
private int completionLocation;
/**
* Start position (inclusive) of source range in original buffer containing
* the relevant token defaults to empty subrange at [0,0).
*/
private int tokenStart = 0;
/**
* End position (exclusive) of source range in original buffer containing
* the relevant token; defaults to empty subrange at [0,0).
*/
private int tokenEnd = 0;
/**
* Completion string; defaults to empty string.
*/
private char[] completion = CharOperation.NO_CHAR;
/**
* Start position (inclusive) of source range in original buffer to be
* replaced by completion string; defaults to empty subrange at [0,0).
*/
private int replaceStart = 0;
/**
* End position (exclusive) of source range in original buffer to be
* replaced by completion string; defaults to empty subrange at [0,0).
*/
private int replaceEnd = 0;
/**
* Relevance rating; positive; higher means better; defaults to minimum
* rating.
*/
private int relevance = 1;
/**
* Signature of the relevant package or type declaration in the context, or
* <code>null</code> if none. Defaults to null.
*/
private char[] declarationSignature = null;
/**
* Simple name of the method, field, member, or variable relevant in the
* context, or <code>null</code> if none. Defaults to null.
*/
private char[] name = null;
/**
* Signature of the method, field type, member type, relevant in the
* context, or <code>null</code> if none. Defaults to null.
*/
private char[] signature = null;
/**
* Modifier flags relevant in the context, or <code>Flags.AccDefault</code>
* if none. Defaults to <code>Flags.AccDefault</code>.
*/
private int flags = Flags.AccDefault;
/**
* Parameter names (for method completions), or <code>null</code> if none.
* Lazily computed. Defaults to <code>null</code>.
*/
private char[][] parameterNames = null;
/**
* Indicates whether parameter names have been computed.
*/
private boolean parameterNamesComputed = false;
/**
* Creates a basic completion proposal. All instance field have plausible
* default values unless otherwise noted.
* <p>
* Note that the constructors for this class are internal to the Java model
* implementation. Clients cannot directly create CompletionProposal
* objects.
* </p>
*
* @param kind
* one of the kind constants declared on this class
* @param completionOffset
* original offset of code completion request
* @return a new completion proposal
*/
public static CompletionProposal create(int kind, int completionOffset) {
return new CompletionProposal(kind, completionOffset);
}
/**
* Creates a basic completion proposal. All instance field have plausible
* default values unless otherwise noted.
* <p>
* Note that the constructors for this class are internal to the Java model
* implementation. Clients cannot directly create CompletionProposal
* objects.
* </p>
*
* @param kind
* one of the kind constants declared on this class
* @param completionLocation
* original offset of code completion request
*/
CompletionProposal(int kind, int completionLocation) {
if ((kind < CompletionProposal.ANONYMOUS_CLASS_DECLARATION)
|| (kind > CompletionProposal.VARIABLE_DECLARATION)) {
throw new IllegalArgumentException();
}
if (this.completion == null || completionLocation < 0) {
throw new IllegalArgumentException();
}
this.completionKind = kind;
this.completionLocation = completionLocation;
}
/**
* Returns the kind of completion being proposed.
* <p>
* The set of different kinds of completion proposals is expected to change
* over time. It is strongly recommended that clients do <b>not</b> assume
* that the kind is one of the ones they know about, and code defensively
* for the possibility of unexpected future growth.
* </p>
*
* @return the kind; one of the kind constants declared on this class, or
* possibly a kind unknown to the caller
*/
public int getKind() {
return this.completionKind;
}
/**
* Returns the character index in the source file buffer where source
* completion was requested (the <code>offset</code>parameter to
* <code>ICodeAssist.codeComplete</code>.
*
* @return character index in source file buffer
* @see ICodeAssist#codeComplete(int,CompletionRequestor)
*/
public int getCompletionLocation() {
return this.completionLocation;
}
/**
* Returns the character index of the start of the subrange in the source
* file buffer containing the relevant token being completed. This token is
* either the identifier or Java language keyword under, or immediately
* preceding, the original request offset. If the original request offset is
* not within or immediately after an identifier or keyword, then the
* position returned is original request offset and the token range is
* empty.
*
* @return character index of token start position (inclusive)
*/
public int getTokenStart() {
return this.tokenStart;
}
/**
* Returns the character index of the end (exclusive) of the subrange in the
* source file buffer containing the relevant token. When there is no
* relevant token, the range is empty (<code>getEndToken() == getStartToken()</code>).
*
* @return character index of token end position (exclusive)
*/
public int getTokenEnd() {
return this.tokenEnd;
}
/**
* Sets the character indices of the subrange in the source file buffer
* containing the relevant token being completed. This token is either the
* identifier or Java language keyword under, or immediately preceding, the
* original request offset. If the original request offset is not within or
* immediately after an identifier or keyword, then the source range begins
* at original request offset and is empty.
* <p>
* If not set, defaults to empty subrange at [0,0).
* </p>
*
* @param startIndex
* character index of token start position (inclusive)
* @param endIndex
* character index of token end position (exclusive)
*/
public void setTokenRange(int startIndex, int endIndex) {
if (startIndex < 0 || endIndex < startIndex) {
throw new IllegalArgumentException();
}
this.tokenStart = startIndex;
this.tokenEnd = endIndex;
}
/**
* Returns the proposed sequence of characters to insert into the source
* file buffer, replacing the characters at the specified source range. The
* string can be arbitrary; for example, it might include not only the name
* of a method but a set of parentheses.
* <p>
* The client must not modify the array returned.
* </p>
*
* @return the completion string
*/
public char[] getCompletion() {
return this.completion;
}
/**
* Sets the proposed sequence of characters to insert into the source file
* buffer, replacing the characters at the specified source range. The
* string can be arbitrary; for example, it might include not only the name
* of a method but a set of parentheses.
* <p>
* If not set, defaults to an empty character array.
* </p>
* <p>
* The completion engine creates instances of this class and sets its
* properties; this method is not intended to be used by other clients.
* </p>
*
* @param completion
* the completion string
*/
public void setCompletion(char[] completion) {
this.completion = completion;
}
/**
* Returns the character index of the start of the subrange in the source
* file buffer to be replaced by the completion string. If the subrange is
* empty (<code>getReplaceEnd() == getReplaceStart()</code>), the
* completion string is to be inserted at this index.
* <p>
* Note that while the token subrange is precisely specified, the
* replacement range is loosely constrained and may not bear any direct
* relation to the original request offset. For example, a it would be
* possible for a type completion to propose inserting an import declaration
* at the top of the compilation unit; or the completion might include
* trailing parentheses and punctuation for a method completion.
* </p>
*
* @return replacement start position (inclusive)
*/
public int getReplaceStart() {
return this.replaceStart;
}
/**
* Returns the character index of the end of the subrange in the source file
* buffer to be replaced by the completion string. If the subrange is empty (<code>getReplaceEnd() == getReplaceStart()</code>),
* the completion string is to be inserted at this index.
*
* @return replacement end position (exclusive)
*/
public int getReplaceEnd() {
return this.replaceEnd;
}
/**
* Sets the character indices of the subrange in the source file buffer to
* be replaced by the completion string. If the subrange is empty (<code>startIndex == endIndex</code>),
* the completion string is to be inserted at this index.
* <p>
* If not set, defaults to empty subrange at [0,0).
* </p>
* <p>
* The completion engine creates instances of this class and sets its
* properties; this method is not intended to be used by other clients.
* </p>
*
* @param startIndex
* character index of replacement start position (inclusive)
* @param endIndex
* character index of replacement end position (exclusive)
*/
public void setReplaceRange(int startIndex, int endIndex) {
if (startIndex < 0 || endIndex < startIndex) {
throw new IllegalArgumentException();
}
this.replaceStart = startIndex;
this.replaceEnd = endIndex;
}
/**
* Returns the relative relevance rating of this proposal.
*
* @return relevance rating of this proposal; ratings are positive; higher
* means better
*/
public int getRelevance() {
return this.relevance;
}
/**
* Sets the relative relevance rating of this proposal.
* <p>
* If not set, defaults to the lowest possible rating (1).
* </p>
* <p>
* The completion engine creates instances of this class and sets its
* properties; this method is not intended to be used by other clients.
* </p>
*
* @param rating
* relevance rating of this proposal; ratings are positive;
* higher means better
*/
public void setRelevance(int rating) {
if (rating <= 0) {
throw new IllegalArgumentException();
}
this.relevance = rating;
}
/**
* Returns the type or package signature of the relevant declaration in the
* context, or <code>null</code> if none.
* <p>
* This field is available for the following kinds of completion proposals:
* <ul>
* <li><code>ANONYMOUS_CLASS_DECLARATION</code> - type signature of the
* type that is being subclassed or implemented</li>
* <li><code>FIELD_REF</code> - type signature of the type that declares
* the field that is referenced</li>
* <li><code>METHOD_REF</code> - type signature of the type that declares
* the method that is referenced</li>
* <li><code>METHOD_DECLARATION</code> - type signature of the type that
* declares the method that is being implemented or overridden</li>
* <li><code>PACKAGE_REF</code> - dot-based package signature of the
* package that is referenced</li>
* <li><code>TYPE_REF</code> - dot-based package signature of the package
* containing the type that is referenced</li>
* </ul>
* For kinds of completion proposals, this method returns <code>null</code>.
* Clients must not modify the array returned.
* </p>
*
* @return the declaration signature, or <code>null</code> if none
* @see Signature
*/
public char[] getDeclarationSignature() {
return this.declarationSignature;
}
/**
* Sets the type or package signature of the relevant declaration in the
* context, or <code>null</code> if none.
* <p>
* If not set, defaults to none.
* </p>
* <p>
* The completion engine creates instances of this class and sets its
* properties; this method is not intended to be used by other clients.
* </p>
*
* @param signature
* the type or package signature, or <code>null</code> if none
*/
public void setDeclarationSignature(char[] signature) {
this.declarationSignature = signature;
}
/**
* Returns the simple name of the method, field, member, or variable
* relevant in the context, or <code>null</code> if none.
* <p>
* This field is available for the following kinds of completion proposals:
* <ul>
* <li><code>FIELD_REF</code> - the name of the field</li>
* <li><code>KEYWORD</code> - the keyword</li>
* <li><code>LABEL_REF</code> - the name of the label</li>
* <li><code>LOCAL_VARIABLE_REF</code> - the name of the local variable</li>
* <li><code>METHOD_REF</code> - the name of the method</li>
* <li><code>METHOD_DECLARATION</code> - the name of the method</li>
* <li><code>VARIABLE_DECLARATION</code> - the name of the variable</li>
* </ul>
* For kinds of completion proposals, this method returns <code>null</code>.
* Clients must not modify the array returned.
* </p>
*
* @return the keyword, field, method, local variable, or member name, or
* <code>null</code> if none
*/
public char[] getName() {
return this.name;
}
/**
* Sets the simple name of the method, field, member, or variable relevant
* in the context, or <code>null</code> if none.
* <p>
* If not set, defaults to none.
* </p>
* <p>
* The completion engine creates instances of this class and sets its
* properties; this method is not intended to be used by other clients.
* </p>
*
* @param name
* the keyword, field, method, local variable, or member name, or
* <code>null</code> if none
*/
public void setName(char[] name) {
this.name = name;
}
/**
* Returns the signature of the method or type relevant in the context, or
* <code>null</code> if none.
* <p>
* This field is available for the following kinds of completion proposals:
* <ul>
* <li><code>ANONYMOUS_CLASS_DECLARATION</code> - method signature of the
* constructor that is being invoked</li>
* <li><code>FIELD_REF</code> - the type signature of the referenced
* field's type</li>
* <li><code>LOCAL_VARIABLE_REF</code> - the type signature of the
* referenced local variable's type</li>
* <li><code>METHOD_REF</code> - method signature of the method that is
* referenced</li>
* <li><code>METHOD_DECLARATION</code> - method signature of the method
* that is being implemented or overridden</li>
* <li><code>TYPE_REF</code> - type signature of the type that is
* referenced</li>
* <li><code>VARIABLE_DECLARATION</code> - the type signature of the type
* of the variable being declared</li>
* </ul>
* For kinds of completion proposals, this method returns <code>null</code>.
* Clients must not modify the array returned.
* </p>
*
* @return the signature, or <code>null</code> if none
* @see Signature
*/
public char[] getSignature() {
return this.signature;
}
/**
* Sets the signature of the method, field type, member type, relevant in
* the context, or <code>null</code> if none.
* <p>
* If not set, defaults to none.
* </p>
* <p>
* The completion engine creates instances of this class and sets its
* properties; this method is not intended to be used by other clients.
* </p>
*
* @param signature
* the signature, or <code>null</code> if none
*/
public void setSignature(char[] signature) {
this.signature = signature;
}
/**
* Returns the modifier flags relevant in the context, or
* <code>Flags.AccDefault</code> if none.
* <p>
* This field is available for the following kinds of completion proposals:
* <ul>
* <li><code>ANONYMOUS_CLASS_DECLARATION</code> - modifier flags of the
* constructor that is referenced</li>
* <li><code>FIELD_REF</code> - modifier flags of the field that is
* referenced; <code>Flags.AccEnum</code> can be used to recognize
* references to enum constants </li>
* <li><code>KEYWORD</code> - modifier flag corrresponding to the
* modifier keyword</li>
* <li><code>LOCAL_VARIABLE_REF</code> - modifier flags of the local
* variable that is referenced</li>
* <li><code>METHOD_REF</code> - modifier flags of the method that is
* referenced; <code>Flags.AccAnnotation</code> can be used to recognize
* references to annotation type members </li>
* <li><code>METHOD_DECLARATION</code> - modifier flags for the method
* that is being implemented or overridden</li>
* <li><code>TYPE_REF</code> - modifier flags of the type that is
* referenced; <code>Flags.AccInterface</code> can be used to recognize
* references to interfaces, <code>Flags.AccEnum</code> enum types, and
* <code>Flags.AccAnnotation</code> annotation types </li>
* <li><code>VARIABLE_DECLARATION</code> - modifier flags for the
* variable being declared</li>
* </ul>
* For kinds of completion proposals, this method returns
* <code>Flags.AccDefault</code>.
* </p>
*
* @return the modifier flags, or <code>Flags.AccDefault</code> if none
* @see Flags
*/
public int getFlags() {
return this.flags;
}
/**
* Sets the modifier flags relevant in the context.
* <p>
* If not set, defaults to none.
* </p>
* <p>
* The completion engine creates instances of this class and sets its
* properties; this method is not intended to be used by other clients.
* </p>
*
* @param flags
* the modifier flags, or <code>Flags.AccDefault</code> if none
*/
public void setFlags(int flags) {
this.flags = flags;
}
/**
* Finds the method parameter names. This information is relevant to method
* reference (and method declaration proposals). Returns <code>null</code>
* if not available or not relevant.
* <p>
* The client must not modify the array returned.
* </p>
* <p>
* <b>Note that this is an expensive thing to compute, which may require
* parsing Java source files, etc. Use sparingly.
* </p>
*
* @param monitor
* the progress monitor, or <code>null</code> if none
* @return the parameter names, or <code>null</code> if none or not
* available or not relevant
*/
public char[][] findParameterNames(IProgressMonitor monitor) {
if (!this.parameterNamesComputed) {
this.parameterNamesComputed = true;
// TODO (jerome) - Missing implementation
}
return this.parameterNames;
}
/**
* Sets the method parameter names. This information is relevant to method
* reference (and method declaration proposals).
* <p>
* The completion engine creates instances of this class and sets its
* properties; this method is not intended to be used by other clients.
* </p>
*
* @param parameterNames
* the parameter names, or <code>null</code> if none
*/
public void setParameterNames(char[][] parameterNames) {
this.parameterNames = parameterNames;
this.parameterNamesComputed = true;
}
}
The table below shows all metrics for CompletionProposal.java.




