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/*******************************************************************************
* Copyright (c) 2000, 2004 QNX Software Systems and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* QNX Software Systems - Initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.debug.internal.core.model;
import org.eclipse.cdt.debug.core.CDebugCorePlugin;
import org.eclipse.cdt.debug.core.ICDebugConstants;
import org.eclipse.cdt.debug.core.cdi.CDIException;
import org.eclipse.cdt.debug.core.cdi.event.ICDIEvent;
import org.eclipse.cdt.debug.core.cdi.event.ICDIResumedEvent;
import org.eclipse.cdt.debug.core.cdi.model.ICDIExpression;
import org.eclipse.cdt.debug.core.cdi.model.ICDIObject;
import org.eclipse.cdt.debug.core.cdi.model.ICDITarget;
import org.eclipse.cdt.debug.core.cdi.model.ICDIValue;
import org.eclipse.cdt.debug.core.cdi.model.ICDIVariableDescriptor;
import org.eclipse.cdt.debug.core.cdi.model.type.ICDIArrayValue;
import org.eclipse.cdt.debug.core.model.CVariableFormat;
import org.eclipse.cdt.debug.core.model.ICStackFrame;
import org.eclipse.cdt.debug.core.model.ICType;
import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.model.IExpression;
import org.eclipse.debug.core.model.IValue;
/**
* Represents an expression in the CDI model.
*/
public class CExpression extends CVariable implements IExpression {
private ICDIExpression fCDIExpression;
private CStackFrame fStackFrame;
private IValue fValue;
private ICType fType;
/**
* Constructor for CExpression.
*/
public CExpression( CStackFrame frame, ICDIExpression cdiExpression, ICDIVariableDescriptor varObject ) {
super( frame, varObject );
setFormat( CVariableFormat.getFormat( CDebugCorePlugin.getDefault().getPluginPreferences().getInt( ICDebugConstants.PREF_DEFAULT_EXPRESSION_FORMAT ))) ;
fCDIExpression = cdiExpression;
fStackFrame = frame;
}
/* (non-Javadoc)
* @see org.eclipse.debug.core.model.IExpression#getExpressionText()
*/
public String getExpressionText() {
return fCDIExpression.getExpressionText();
}
/* (non-Javadoc)
* @see org.eclipse.cdt.debug.core.cdi.event.ICDIEventListener#handleDebugEvents(org.eclipse.cdt.debug.core.cdi.event.ICDIEvent[])
*/
public void handleDebugEvents( ICDIEvent[] events ) {
for( int i = 0; i < events.length; i++ ) {
ICDIEvent event = events[i];
if ( event instanceof ICDIResumedEvent ) {
ICDIObject source = event.getSource();
if ( source != null ) {
ICDITarget cdiTarget = source.getTarget();
if ( getCDITarget().equals( cdiTarget ) ) {
setChanged( false );
resetValue();
}
}
}
}
super.handleDebugEvents( events );
}
/* (non-Javadoc)
* @see org.eclipse.cdt.debug.core.model.ICVariable#isEnabled()
*/
public boolean isEnabled() {
return true;
}
/* (non-Javadoc)
* @see org.eclipse.cdt.debug.core.model.ICVariable#canEnableDisable()
*/
public boolean canEnableDisable() {
return true;
}
/* (non-Javadoc)
* @see org.eclipse.cdt.debug.internal.core.model.CVariable#isBookkeepingEnabled()
*/
protected boolean isBookkeepingEnabled() {
return false;
}
/* (non-Javadoc)
* @see org.eclipse.debug.core.model.IExpression#getValue()
*/
public IValue getValue() {
CStackFrame frame = (CStackFrame)getStackFrame();
try {
return getValue( frame );
}
catch( DebugException e ) {
}
return null;
}
protected synchronized IValue getValue( CStackFrame context ) throws DebugException {
if ( fValue == null ) {
if ( context.isSuspended() ) {
try {
ICDIValue value = fCDIExpression.getValue( context.getCDIStackFrame() );
if ( value != null ) {
if ( value instanceof ICDIArrayValue ) {
ICType type = null;
try {
type = new CType( value.getType() );
}
catch( CDIException e ) {
// ignore and use default type
}
if ( type != null && type.isArray() ) {
int[] dims = type.getArrayDimensions();
if ( dims.length > 0 && dims[0] > 0 )
fValue = CValueFactory.createIndexedValue( this, (ICDIArrayValue)value, 0, dims[0] );
}
}
else {
fValue = CValueFactory.createValue( this, value );
}
}
}
catch( CDIException e ) {
targetRequestFailed( e.getMessage(), null );
}
}
}
return fValue;
}
protected ICStackFrame getStackFrame() {
return fStackFrame;
}
protected void resetValue() {
if ( fValue instanceof AbstractCValue ) {
((AbstractCValue)fValue).reset();
}
fValue = null;
}
/* (non-Javadoc)
* @see org.eclipse.cdt.debug.internal.core.model.AbstractCVariable#getExpressionString()
*/
public String getExpressionString() throws DebugException {
return getExpressionText();
}
/* (non-Javadoc)
* @see org.eclipse.cdt.debug.internal.core.model.AbstractCVariable#dispose()
*/
public void dispose() {
if ( fCDIExpression != null ) {
try {
fCDIExpression.dispose();
fCDIExpression = null;
}
catch( CDIException e ) {
}
}
if ( fValue instanceof AbstractCValue ) {
((AbstractCValue)fValue).dispose();
fValue = null;
}
internalDispose( true );
}
/* (non-Javadoc)
* @see org.eclipse.cdt.debug.core.model.ICVariable#getType()
*/
public ICType getType() throws DebugException {
if ( fType == null ) {
if ( fValue != null ) {
synchronized( this ) {
if ( fType == null ) {
fType = ((AbstractCValue)fValue).getType();
}
}
}
}
return fType;
}
/* (non-Javadoc)
* @see org.eclipse.debug.core.model.IVariable#getReferenceTypeName()
*/
public String getReferenceTypeName() throws DebugException {
ICType type = getType();
return ( type != null ) ? type.getName() : ""; //$NON-NLS-1$
}
}
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