1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.xml.internal.xsom; 27 28 import com.sun.xml.internal.xsom.visitor.XSTermFunction; 29 import com.sun.xml.internal.xsom.visitor.XSTermVisitor; 30 import com.sun.xml.internal.xsom.visitor.XSTermFunctionWithParam; 31 32 /** 33 * A component that can be referenced from {@link XSParticle} 34 * 35 * This interface provides a set of type check functions (<code>isXXX</code>), 36 * which are essentially: 37 * 38 * <pre> 39 * boolean isXXX() { 40 * return this instanceof XXX; 41 * } 42 * </pre> 43 * 44 * and a set of cast functions (<code>asXXX</code>), which are 45 * essentially: 46 * 47 * <pre> 48 * XXX asXXX() { 49 * if(isXXX()) return (XXX)this; 50 * else return null; 51 * } 52 * </pre> 53 */ 54 public interface XSTerm extends XSComponent 55 { 56 void visit( XSTermVisitor visitor ); 57 <T> T apply( XSTermFunction<T> function ); 58 <T,P> T apply( XSTermFunctionWithParam<T,P> function, P param ); 59 60 // cast functions 61 boolean isWildcard(); 62 boolean isModelGroupDecl(); 63 boolean isModelGroup(); 64 boolean isElementDecl(); 65 66 XSWildcard asWildcard(); 67 XSModelGroupDecl asModelGroupDecl(); 68 XSModelGroup asModelGroup(); 69 XSElementDecl asElementDecl(); 70 }