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/*
* Copyright (C) 2007-2010 Júlio Vilmar Gesser.
* Copyright (C) 2011, 2013-2016 The JavaParser Team.
*
* This file is part of JavaParser.
*
* JavaParser can be used either under the terms of
* a) the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* b) the terms of the Apache License
*
* You should have received a copy of both licenses in LICENCE.LGPL and
* LICENCE.APACHE. Please refer to those files for details.
*
* JavaParser is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*/
package com.github.javaparser.ast;
import com.github.javaparser.Range;
import com.github.javaparser.ast.expr.NameExpr;
import com.github.javaparser.ast.visitor.GenericVisitor;
import com.github.javaparser.ast.visitor.VoidVisitor;
/**
* <p>
* This class represents a import declaration or an empty import declaration. Imports are optional for the
* {@link CompilationUnit}.
* </p>
* The ImportDeclaration is constructed following the syntax:<br>
* <pre>
* {@code
* ImportDeclaration ::= "import" ( "static" )? }{@link NameExpr}{@code ( "." "*" )? ";"
* }
* </pre>
* An enmpty import declaration is simply a semicolon among the import declarations.
* @author Julio Vilmar Gesser
*/
public final class ImportDeclaration extends Node {
private NameExpr name;
private boolean static_;
private boolean asterisk;
private boolean isEmptyImportDeclaration;
private ImportDeclaration() {
this.isEmptyImportDeclaration = true;
static_ = false;
asterisk = false;
}
private ImportDeclaration(Range range) {
super(range);
this.isEmptyImportDeclaration = true;
static_ = false;
asterisk = false;
}
/**
* Create an empty import declaration without specifying its position.
*/
public static ImportDeclaration createEmptyDeclaration(){
return new ImportDeclaration();
}
/**
* Create an empty import declaration specifying its position.
*/
public static ImportDeclaration createEmptyDeclaration(Range range){
return new ImportDeclaration(range);
}
public ImportDeclaration(NameExpr name, boolean isStatic, boolean isAsterisk) {
setAsterisk(isAsterisk);
setName(name);
setStatic(isStatic);
this.isEmptyImportDeclaration = false;
}
public ImportDeclaration(Range range, NameExpr name, boolean isStatic, boolean isAsterisk) {
super(range);
setAsterisk(isAsterisk);
setName(name);
setStatic(isStatic);
this.isEmptyImportDeclaration = false;
}
/**
* Is this an empty import declaration or a normal import declaration?
*/
public boolean isEmptyImportDeclaration(){
return this.isEmptyImportDeclaration;
}
@Override
public <R, A> R accept(GenericVisitor<R, A> v, A arg) {
return v.visit(this, arg);
}
@Override
public <A> void accept(VoidVisitor<A> v, A arg) {
v.visit(this, arg);
}
/**
* Retrieves the name of the import.
*
* @return the name of the import
* @throws UnsupportedOperationException when invoked on an empty import declaration
*/
public NameExpr getName() {
if (isEmptyImportDeclaration) {
throw new UnsupportedOperationException("Empty import declarations have no name");
}
return name;
}
/**
* Return if the import ends with "*".
*
* @return <code>true</code> if the import ends with "*", <code>false</code>
* otherwise
*/
public boolean isAsterisk() {
return asterisk;
}
/**
* Return if the import is static.
*
* @return <code>true</code> if the import is static, <code>false</code>
* otherwise
*/
public boolean isStatic() {
return static_;
}
/**
* Sets if this import is asterisk.
*
* @param asterisk
* <code>true</code> if this import is asterisk
* @throws UnsupportedOperationException when setting true on an empty import declaration
*/
public void setAsterisk(boolean asterisk) {
if (isEmptyImportDeclaration && asterisk) {
throw new UnsupportedOperationException("Empty import cannot have asterisk");
}
this.asterisk = asterisk;
}
/**
* Sets the name this import.
*
* @param name
* the name to set
* @throws UnsupportedOperationException when invoked on an empty import declaration
*/
public void setName(NameExpr name) {
if (isEmptyImportDeclaration) {
throw new UnsupportedOperationException("Empty import cannot have name");
}
this.name = name;
setAsParentNodeOf(this.name);
}
/**
* Sets if this import is static.
*
* @param static_
* <code>true</code> if this import is static
* @throws UnsupportedOperationException when setting true on an empty import declaration
*/
public void setStatic(boolean static_) {
if (isEmptyImportDeclaration && static_) {
throw new UnsupportedOperationException("Empty import cannot be static");
}
this.static_ = static_;
}
}
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