| /******************************************************************************* |
| * Copyright (c) 2000, 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.jdt.internal.debug.core.model; |
| |
| |
| import java.text.MessageFormat; |
| |
| import org.eclipse.debug.core.DebugException; |
| import org.eclipse.debug.core.model.IValue; |
| import org.eclipse.jdt.debug.core.IJavaModifiers; |
| import org.eclipse.jdt.debug.core.IJavaType; |
| import org.eclipse.jdt.debug.core.IJavaVariable; |
| |
| import com.sun.jdi.Type; |
| import com.sun.jdi.Value; |
| |
| public abstract class JDIVariable extends JDIDebugElement implements IJavaVariable { |
| |
| /** |
| * Cache of current value - see #getValue(). |
| */ |
| private JDIValue fValue; |
| |
| /** |
| * Counter corresponding to this variable's debug target |
| * suspend count indicating the last time this value |
| * changed. This variable's value has changed on the |
| * last suspend event if this counter is equal to the |
| * debug target's suspend count. |
| */ |
| private int fLastChangeIndex = -1; |
| |
| protected final static String jdiStringSignature= "Ljava/lang/String;"; //$NON-NLS-1$ |
| |
| public JDIVariable(JDIDebugTarget target) { |
| super(target); |
| } |
| |
| /** |
| * @see PlatformObject#getAdapter(Class) |
| */ |
| public Object getAdapter(Class adapter) { |
| if (adapter == IJavaVariable.class || adapter == IJavaModifiers.class) { |
| return this; |
| } |
| return super.getAdapter(adapter); |
| } |
| |
| /** |
| * Returns this variable's current underlying jdi value. |
| * Subclasses must implement #retrieveValue() and do not |
| * need to guard against JDI exceptions, as this method |
| * handles them. |
| * |
| * @exception DebugException if unable to access the value |
| */ |
| protected final Value getCurrentValue() throws DebugException { |
| try { |
| return retrieveValue(); |
| } catch (RuntimeException e) { |
| targetRequestFailed(MessageFormat.format(JDIDebugModelMessages.JDIVariable_exception_retrieving, new String[] {e.toString()}), e); |
| // execution will not reach this line, as |
| // #targetRequestFailed will throw an exception |
| return null; |
| } |
| } |
| |
| /** |
| * Returns this variable's underlying jdi value |
| */ |
| protected abstract Value retrieveValue() throws DebugException; |
| |
| /** |
| * Returns the current value of this variable. The value |
| * is cached, but on each access we see if the value has changed |
| * and update if required. |
| * |
| * @see IVariable#getValue() |
| */ |
| public IValue getValue() throws DebugException { |
| Value currentValue = getCurrentValue(); |
| if (fValue == null) { |
| fValue = JDIValue.createValue((JDIDebugTarget)getDebugTarget(), currentValue); |
| } else { |
| Value previousValue = fValue.getUnderlyingValue(); |
| if (currentValue == previousValue) { |
| return fValue; |
| } |
| if (previousValue == null || currentValue == null) { |
| fValue = JDIValue.createValue((JDIDebugTarget)getDebugTarget(), currentValue); |
| setChangeCount(getJavaDebugTarget().getSuspendCount()); |
| } else if (!previousValue.equals(currentValue)) { |
| fValue = JDIValue.createValue((JDIDebugTarget)getDebugTarget(), currentValue); |
| setChangeCount(getJavaDebugTarget().getSuspendCount()); |
| } |
| } |
| return fValue; |
| } |
| |
| /** |
| * @see IValueModification#supportsValueModification() |
| */ |
| public boolean supportsValueModification() { |
| return false; |
| } |
| |
| /** |
| * @see IValueModification#setValue(String) |
| */ |
| public void setValue(String expression) throws DebugException { |
| notSupported(JDIDebugModelMessages.JDIVariable_does_not_support_value_modification); |
| } |
| |
| /** |
| * @see IValueModification#setValue(IValue) |
| */ |
| public void setValue(IValue value) throws DebugException { |
| notSupported(JDIDebugModelMessages.JDIVariable_does_not_support_value_modification); |
| } |
| |
| /** |
| * @see IValueModification#verifyValue(String) |
| */ |
| public boolean verifyValue(String expression) { |
| return false; |
| } |
| |
| /** |
| * @see IValueModification#verifyValue(IValue) |
| */ |
| public boolean verifyValue(IValue value) { |
| return false; |
| } |
| |
| /** |
| * @see IJavaModifiers#isSynthetic() |
| */ |
| public boolean isSynthetic() { |
| return false; |
| } |
| |
| /** |
| * @see IJavaModifiers#isPublic() |
| */ |
| public boolean isPublic() throws DebugException { |
| return false; |
| } |
| |
| /** |
| * @see IJavaModifiers#isPrivate() |
| */ |
| public boolean isPrivate() throws DebugException { |
| return false; |
| } |
| |
| /** |
| * @see IJavaModifiers#isProtected() |
| */ |
| public boolean isProtected() throws DebugException { |
| return false; |
| } |
| |
| /** |
| * @see IJavaModifiers#isPackagePrivate() |
| */ |
| public boolean isPackagePrivate() { |
| return false; |
| } |
| |
| /** |
| * @see IJavaModifiers#isStatic() |
| */ |
| public boolean isStatic() { |
| return false; |
| } |
| |
| /** |
| * @see IJavaModifiers#isFinal() |
| */ |
| public boolean isFinal() { |
| return false; |
| } |
| |
| /** |
| * @see org.eclipse.jdt.debug.core.IJavaVariable#isLocal() |
| */ |
| public boolean isLocal() { |
| return false; |
| } |
| |
| /** |
| * @see IJavaVariable#getJavaType() |
| */ |
| public IJavaType getJavaType() throws DebugException { |
| return JDIType.createType((JDIDebugTarget)getDebugTarget(), getUnderlyingType()); |
| } |
| |
| /** |
| * Returns the underlying type of this variable |
| * |
| * @return the underlying type of this variable |
| * |
| * @exception DebugException if this method fails. Reasons include: |
| * <ul><li>Failure communicating with the VM. The DebugException's |
| * status code contains the underlying exception responsible for |
| * the failure.</li> |
| * <li>The type associated with this variable is not yet loaded</li></ul> |
| */ |
| protected abstract Type getUnderlyingType() throws DebugException; |
| |
| /** |
| * Returns the last known value for this variable |
| */ |
| protected Value getLastKnownValue() { |
| if (fValue == null) { |
| return null; |
| } |
| return fValue.getUnderlyingValue(); |
| } |
| |
| /** |
| * Sets this variable's change counter to the specified value |
| * |
| * @param count new value |
| */ |
| protected void setChangeCount(int count) { |
| fLastChangeIndex = count; |
| } |
| |
| /** |
| * Returns this variable's change counter. This corresponds to the |
| * last time this variable changed. |
| * |
| * @return this variable's change counter |
| */ |
| protected int getChangeCount() { |
| return fLastChangeIndex; |
| } |
| |
| /** |
| * @see IVariable#hasValueChanged() |
| */ |
| public boolean hasValueChanged() { |
| return getChangeCount() == getJavaDebugTarget().getSuspendCount(); |
| } |
| } |