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/*
* Copyright 2000-2009 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.intellij.xdebugger.frame;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
/**
* Represents a value in debugger tree.
* Override {@link XValueContainer#computeChildren} if value has a properties which should be shown as child nodes
*
* @author nik
*/
public abstract class XValue extends XValueContainer {
/**
* Start computing presentation of the value in the debugger tree and call {@link XValueNode#setPresentation(javax.swing.Icon, String, String, boolean)}
* when computation is finished.
* Note that this method is called from the Event Dispatch thread so it should return quickly.
* @param node node
* @param place where the node will be shown.
*/
public abstract void computePresentation(@NotNull XValueNode node, @NotNull XValuePlace place);
/**
* @return expression which evaluates to the current value
*/
@Nullable
public String getEvaluationExpression() {
return null;
}
/**
* @return {@link com.intellij.xdebugger.frame.XValueModifier} instance which can be used to modify the value
*/
@Nullable
public XValueModifier getModifier() {
return null;
}
/**
* Start computing source position of the value and call {@link XNavigatable#setSourcePosition(com.intellij.xdebugger.XSourcePosition)}
* when computation is finished.
* Note that this method is called from the Event Dispatch thread so it should return quickly.
* @param navigatable navigatable
*/
public void computeSourcePosition(@NotNull XNavigatable navigatable) {
navigatable.setSourcePosition(null);
}
/**
* Return {@code true} from this method and override {@link #computeSourcePosition(XNavigatable)} if navigation to the source
* is supported for the value
* @return {@code true} if navigation to the value's source is supported
*/
public boolean canNavigateToSource() {
// should be false, but cannot be due to compatibility reasons
return true;
}
/**
* Return {@code true} from this method and override {@link #computeTypeSourcePosition(XNavigatable)} if navigation to the value's type
* is supported for the value
* @return {@code true} if navigation to the value's type is supported
*/
public boolean canNavigateToTypeSource() {
return false;
}
/**
* Start computing source position of the value's type and call {@link XNavigatable#setSourcePosition(com.intellij.xdebugger.XSourcePosition)}
* when computation is finished.
* Note that this method is called from the Event Dispatch thread so it should return quickly.
*/
public void computeTypeSourcePosition(@NotNull XNavigatable navigatable) {
navigatable.setSourcePosition(null);
}
/**
* This enables showing referrers for the value
*
* @return provider that creates an XValue returning objects that refer to the current value
* or null if showing referrers for the value is disabled
*/
@Nullable
public XReferrersProvider getReferrersProvider() {
return null;
}
}
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