| /******************************************************************************* |
| * Copyright (c) 2001, 2005 IBM Corporation and others. |
| * 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jem.internal.proxy.initParser; |
| /* |
| |
| |
| */ |
| |
| |
| /** |
| * Insert the type's description here. |
| * Creation date: (11/05/00 10:39:28 PM) |
| * @author: Administrator |
| */ |
| public class Field extends Expression { |
| public boolean isComplete; |
| protected java.lang.reflect.Field fField; |
| public Expression receiver; |
| public String fieldName; |
| protected Class fResultType; |
| |
| public Field(Expression aReceiver , char[] token , ClassLoader aClassLoader){ |
| |
| receiver = aReceiver; |
| if ( token.length > 0 ){ |
| fieldName = new String(token); |
| } |
| |
| } |
| public boolean isComplete(){ |
| return isComplete; |
| } |
| |
| /** |
| * Send the message to the receiver |
| */ |
| public Object evaluate() throws Exception { |
| Object receiverValue = receiver.evaluate(); // So if it fails, we get an evaluation exception going on up. |
| try { |
| cacheField(); |
| return fField.get(receiverValue); |
| } catch (Exception e) { |
| throw new EvaluationException(e); // Any exception at this point is an evaluation exception. |
| } |
| } |
| |
| /** |
| * Get the field from reflection. |
| */ |
| protected void cacheField() throws Exception { |
| if (fField == null) { |
| Class aReceiverClass = getEvaluationTypeClass(receiver); |
| fField = aReceiverClass.getField(fieldName); |
| fResultType = fField.getType(); |
| } |
| } |
| |
| /** |
| * The result type is the type of the field. |
| */ |
| public Class getTypeClass() throws Exception { |
| if ( fResultType == null ) { |
| cacheField(); |
| } |
| return fResultType; |
| } |
| |
| protected String getTypeClassName() { |
| return ""; // If we got this far, we don't know what it is. //$NON-NLS-1$ |
| } |
| /** |
| * push method comment. |
| */ |
| public Expression push(char[] token, char tokenDelimiter) { |
| |
| // If the delimiter is a ( then this is the start of a message |
| if ( tokenDelimiter == DelimiterOpenParen ) { |
| return new Message(this , token , fClassLoader); |
| } |
| |
| // If the delimiter is a . then this is a field |
| if (token.length > 0 && ( tokenDelimiter == DelimiterPeriod || tokenDelimiter == DelimiterSpace |
| || tokenDelimiter == DelimiterComma)) { |
| isComplete = true; |
| return new Field(this , token , fClassLoader); |
| |
| } |
| |
| if(fieldName != null && tokenDelimiter == DelimiterComma){ |
| isComplete = true; |
| return this; |
| } |
| |
| // If we have no delimiter or a close paren then we have just received the field name |
| if (!isComplete && fieldName == null) { |
| fieldName = new String(token); |
| return this; |
| } |
| |
| if(tokenDelimiter == BitOR || tokenDelimiter == BitAND){ |
| isComplete = true; |
| PrimitiveOperation result = new PrimitiveOperation(this,tokenDelimiter); |
| return result; |
| } |
| |
| // Ignore spaces as this maybe padding between the field and the next valid token |
| if(token.length == 0 && tokenDelimiter == ' ') return this; |
| |
| throw new RuntimeException(java.text.MessageFormat.format(ProxyInitParserMessages.getString(ProxyInitParserMessages.UNEXPECTED_TOKEN), new Object[] {new StringBuffer(token.length+1).append(token).append(tokenDelimiter).toString()})); |
| |
| } |
| public String toString(){ |
| |
| java.io.StringWriter writer = new java.io.StringWriter(); |
| writer.write("Field Name=\""); //$NON-NLS-1$ |
| if ( fieldName != null ) { |
| writer.write(fieldName); |
| } else { |
| writer.write("UNNAMED"); //$NON-NLS-1$ |
| } |
| writer.write("\" Receiver="); //$NON-NLS-1$ |
| if ( receiver != null ){ |
| writer.write(receiver.toString()); |
| } else { |
| writer.write("NONE"); //$NON-NLS-1$ |
| } |
| return writer.toString(); |
| |
| } |
| |
| /** |
| * Test the field type to determine if primitive or not. |
| */ |
| public boolean isPrimitive() throws Exception { |
| cacheField(); |
| return getTypeClass().isPrimitive(); |
| } |
| } |