| /******************************************************************************* |
| * Copyright (c) 2006 Oracle Corporation. |
| * 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: |
| * Cameron Bateman/Oracle - initial API and implementation |
| * |
| ********************************************************************************/ |
| |
| package org.eclipse.jst.jsf.core.internal.types; |
| |
| import java.math.BigDecimal; |
| import java.math.BigInteger; |
| |
| /** |
| * Represents a NullLiteralType per JSP.2.9 |
| * |
| * @author cbateman |
| * |
| */ |
| public class NullLiteralType extends LiteralType |
| { |
| /** |
| * The singleton null literal |
| */ |
| public final static NullLiteralType SINGLETON = new NullLiteralType(); |
| |
| /** |
| * Construct a new null |
| */ |
| private NullLiteralType() |
| { |
| super(TypeConstants.TYPE_NULL); // use void to indicate null in this situation |
| } |
| |
| /** |
| * Per JSP.2.8.5 null is always false |
| * |
| * @see org.eclipse.jst.jsf.core.internal.types.LiteralType#coerceToBoolean() |
| */ |
| public Boolean coerceToBoolean() throws TypeCoercionException |
| { |
| return Boolean.FALSE; |
| } |
| |
| /** |
| * Per JSP.2.8.3, null is always 0 |
| * |
| * @see org.eclipse.jst.jsf.core.internal.types.LiteralType#coerceToNumber(java.lang.Class) |
| */ |
| public Number coerceToNumber(Class T) throws TypeCoercionException { |
| if (T == BigInteger.class) |
| { |
| return BigInteger.ZERO; |
| } |
| else if (T == BigDecimal.class) |
| { |
| return new BigDecimal(0.0); |
| } |
| else if (T == Double.class || T == Double.TYPE) |
| { |
| return new Double(0.0); |
| } |
| else if (T == Float.class || T == Float.TYPE) |
| { |
| return new Float(0.0); |
| } |
| else if (T == Long.class || T == Long.TYPE) |
| { |
| return new Long(0L); |
| } |
| else if (T == Integer.class || T == Integer.TYPE) |
| { |
| return new Integer(0); |
| } |
| else if (T == Short.class || T == Short.TYPE) |
| { |
| return new Short((short)0); |
| } |
| else if (T == Byte.class || T == Byte.TYPE) |
| { |
| return new Byte((byte)0); |
| } |
| else |
| { |
| throw new IllegalArgumentException("Not a target numeric type: "+T); |
| } |
| } |
| |
| /** |
| * Per JSP.2.8.2 null is always an empty string |
| * @see org.eclipse.jst.jsf.core.internal.types.LiteralType#getLiteralValue() |
| */ |
| public String getLiteralValue() |
| { |
| return ""; |
| } |
| |
| } |