Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2013 IBM Corporation and others. * * This program and the accompanying materials * are made available under the terms of the Eclipse Public License 2.0 * which accompanies this distribution, and is available at * https://www.eclipse.org/legal/epl-2.0/ * * SPDX-License-Identifier: EPL-2.0 * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/ package org.eclipse.jdt.core.dom; import java.util.ArrayList; import java.util.List; import org.eclipse.jdt.core.compiler.InvalidInputException; import org.eclipse.jdt.internal.compiler.parser.Scanner; import org.eclipse.jdt.internal.compiler.parser.TerminalTokens; /** * Number literal nodes. * * @since 2.0 * @noinstantiate This class is not intended to be instantiated by clients. */ @SuppressWarnings("rawtypes") public class NumberLiteral extends Expression { /** * The "token" structural property of this node type (type: {@link String}). * @since 3.0 */ public static final SimplePropertyDescriptor TOKEN_PROPERTY = new SimplePropertyDescriptor(NumberLiteral.class, "token", String.class, MANDATORY); //$NON-NLS-1$ /** * A list of property descriptors (element type: * {@link StructuralPropertyDescriptor}), * or null if uninitialized. */ private static final List PROPERTY_DESCRIPTORS; static { List propertyList = new ArrayList(2); createPropertyList(NumberLiteral.class, propertyList); addProperty(TOKEN_PROPERTY, propertyList); PROPERTY_DESCRIPTORS = reapPropertyList(propertyList); } /** * Returns a list of structural property descriptors for this node type. * Clients must not modify the result. * * @param apiLevel the API level; one of the * <code>AST.JLS*</code> constants * @return a list of property descriptors (element type: * {@link StructuralPropertyDescriptor}) * @since 3.0 */ public static List propertyDescriptors(int apiLevel) { return PROPERTY_DESCRIPTORS; } /** * The token string; defaults to the integer literal "0". */ private String tokenValue = "0";//$NON-NLS-1$ /** * Creates a new unparented number literal node owned by the given AST. * By default, the number literal is the token "<code>0</code>". * <p> * N.B. This constructor is package-private. * </p> * * @param ast the AST that is to own this node */ NumberLiteral(AST ast) { super(ast); } @Override final List internalStructuralPropertiesForType(int apiLevel) { return propertyDescriptors(apiLevel); } @Override final Object internalGetSetObjectProperty(SimplePropertyDescriptor property, boolean get, Object value) { if (property == TOKEN_PROPERTY) { if (get) { return getToken(); } else { setToken((String) value); return null; } } // allow default implementation to flag the error return super.internalGetSetObjectProperty(property, get, value); } @Override final int getNodeType0() { return NUMBER_LITERAL; } @Override ASTNode clone0(AST target) { NumberLiteral result = new NumberLiteral(target); result.setSourceRange(getStartPosition(), getLength()); result.setToken(getToken()); return result; } @Override final boolean subtreeMatch0(ASTMatcher matcher, Object other) { // dispatch to correct overloaded match method return matcher.match(this, other); } @Override void accept0(ASTVisitor visitor) { visitor.visit(this); visitor.endVisit(this); } /** * Returns the token of this number literal node. The value is the sequence * of characters that would appear in the source program. * * @return the numeric literal token */ public String getToken() { return this.tokenValue; } /** * Sets the token of this number literal node. The value is the sequence * of characters that would appear in the source program. * * @param token the numeric literal token * @exception IllegalArgumentException if the argument is incorrect */ public void setToken(String token) { // update internalSetToken(String) if this is changed if (token == null || token.length() == 0) { throw new IllegalArgumentException(); } Scanner scanner = this.ast.scanner; char[] source = token.toCharArray(); scanner.setSource(source); scanner.resetTo(0, source.length); scanner.tokenizeComments = false; scanner.tokenizeWhiteSpace = false; try { int tokenType = scanner.getNextToken(); switch (tokenType) { case TerminalTokens.TokenNameDoubleLiteral: case TerminalTokens.TokenNameIntegerLiteral: case TerminalTokens.TokenNameFloatingPointLiteral: case TerminalTokens.TokenNameLongLiteral: break; case TerminalTokens.TokenNameMINUS: tokenType = scanner.getNextToken(); switch (tokenType) { case TerminalTokens.TokenNameDoubleLiteral: case TerminalTokens.TokenNameIntegerLiteral: case TerminalTokens.TokenNameFloatingPointLiteral: case TerminalTokens.TokenNameLongLiteral: break; default: throw new IllegalArgumentException("Invalid number literal : >" + token + "<"); //$NON-NLS-1$//$NON-NLS-2$ } break; default: throw new IllegalArgumentException("Invalid number literal : >" + token + "<");//$NON-NLS-1$//$NON-NLS-2$ } } catch (InvalidInputException e) { throw new IllegalArgumentException(); } finally { scanner.tokenizeComments = true; scanner.tokenizeWhiteSpace = true; } preValueChange(TOKEN_PROPERTY); this.tokenValue = token; postValueChange(TOKEN_PROPERTY); } /* (omit javadoc for this method) * This method is a copy of setToken(String) that doesn't do any validation. */ void internalSetToken(String token) { preValueChange(TOKEN_PROPERTY); this.tokenValue = token; postValueChange(TOKEN_PROPERTY); } @Override int memSize() { int size = BASE_NODE_SIZE + 1 * 4 + stringSize(this.tokenValue); return size; } @Override int treeSize() { return memSize(); } }