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observing: create interface AstObserver
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7 changes: 4 additions & 3 deletions
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javaparser-core/src/main/java/com/github/javaparser/HasParentNode.java
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javaparser-core/src/main/java/com/github/javaparser/ast/observing/AstObserver.java
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package com.github.javaparser.ast.observing; | ||
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import com.github.javaparser.ast.Node; | ||
import com.github.javaparser.ast.NodeList; | ||
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public interface AstObserver { | ||
void propertyChange(Node observedNode, String propertyName, Object oldValue, Object newValue); | ||
void parentChange(Node observedNode, Node previousParent, Node newParent); | ||
void listChange(NodeList observedNode, ListChangeType type, int index, Node nodeAddedOrRemoved); | ||
} |
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javaparser-core/src/main/java/com/github/javaparser/ast/observing/ListObserver.java
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javaparser-core/src/main/java/com/github/javaparser/ast/observing/NodeObserver.java
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javaparser-core/src/main/java/com/github/javaparser/ast/observing/Observable.java
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package com.github.javaparser.ast.observing; | ||
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public interface Observable<O> { | ||
void register(O observer); | ||
void unregister(O observer); | ||
public interface Observable { | ||
void register(AstObserver observer); | ||
void unregister(AstObserver observer); | ||
boolean isRegistered(AstObserver observer); | ||
} |
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...parser-core/src/main/java/com/github/javaparser/ast/observing/PropagatingAstObserver.java
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package com.github.javaparser.ast.observing; | ||
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import com.github.javaparser.ast.Node; | ||
import com.github.javaparser.ast.NodeList; | ||
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public abstract class PropagatingAstObserver implements AstObserver { | ||
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@Override | ||
public void propertyChange(Node observedNode, String propertyName, Object oldValue, Object newValue) { | ||
considerRemoving(oldValue); | ||
considerAdding(newValue); | ||
concretePropertyChange(observedNode, propertyName, oldValue, newValue); | ||
} | ||
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@Override | ||
public void listChange(NodeList observedNode, ListChangeType type, int index, Node nodeAddedOrRemoved) { | ||
if (type == ListChangeType.REMOVAL) { | ||
considerRemoving(nodeAddedOrRemoved); | ||
} else if (type == ListChangeType.ADDITION) { | ||
considerAdding(nodeAddedOrRemoved); | ||
} | ||
concreteListChange(observedNode, type, index, nodeAddedOrRemoved); | ||
} | ||
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protected abstract void concretePropertyChange(Node observedNode, String propertyName, Object oldValue, Object newValue); | ||
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protected abstract void concreteListChange(NodeList observedNode, ListChangeType type, int index, Node nodeAddedOrRemoved); | ||
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private void considerRemoving(Object element) { | ||
if (element instanceof Observable) { | ||
if (((Observable) element).isRegistered(this)) { | ||
((Observable) element).unregister(this); | ||
} | ||
} | ||
} | ||
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private void considerAdding(Object element) { | ||
if (element instanceof Observable) { | ||
((Observable) element).register(this); | ||
} | ||
} | ||
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} |