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/*
* Copyright (c) 2013 QNX Software Systems and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.cdt.internal.qt.core.pdom;
import java.util.ArrayList;
import java.util.Arrays;
import org.eclipse.cdt.core.dom.IPDOMNode;
import org.eclipse.cdt.core.dom.IPDOMVisitor;
import org.eclipse.cdt.internal.core.pdom.dom.PDOMNamedNode;
import org.eclipse.core.runtime.CoreException;
/**
* A Qt-specific specialization of the generic PDOMVisitor. This class provides
* an empty implementation of {@link #leave(IPDOMNode)}, but required implementations to
* provide {@link #visit(IPDOMNode)}. The class also provides a few commonly required
* implementations.
*/
@SuppressWarnings("restriction")
public abstract class QtPDOMVisitor implements IPDOMVisitor {
/**
* Collects all nodes that match the given type. This could be used, for example, to get
* all QtPDOMQObject's from the index.
*/
public static class All<T> extends QtPDOMVisitor {
private final Class<T> cls;
public final ArrayList<T> list = new ArrayList<T>();
public All(Class<T> cls) {
this.cls = cls;
}
@Override
@SuppressWarnings("unchecked")
public boolean visit(IPDOMNode node) throws CoreException {
if (node != null && cls.isAssignableFrom(node.getClass()))
list.add((T) node);
return true;
}
}
/**
* A simple interface that is used to select node's from the index based on specific
* criteria.
*/
public static interface IFilter {
public boolean matches(IPDOMNode node) throws CoreException;
}
/**
* A filter that selects nodes based on their name.
*/
public static class PDOMNamedNodeFilter implements IFilter {
private final char[] name;
public PDOMNamedNodeFilter(String name) {
this.name = name.toCharArray();
}
@Override
public boolean matches(IPDOMNode node) throws CoreException {
if (node instanceof PDOMNamedNode)
return Arrays.equals(name, ((PDOMNamedNode) node).getNameCharArray());
return false;
}
}
/**
* A utility class that searches the index for all nodes that match the given filter.
*/
public static class Find<T> extends QtPDOMVisitor {
private final Class<T> cls;
private final IFilter filter;
public T element;
public Find(Class<T> cls, IFilter filter) {
this.cls = cls;
this.filter = filter;
}
@Override
@SuppressWarnings("unchecked")
public boolean visit(IPDOMNode node) throws CoreException {
if (element != null)
return false;
if (cls.isAssignableFrom(node.getClass()) && filter.matches(node))
element = (T) node;
return element == null;
}
}
@Override
public void leave(IPDOMNode node) throws CoreException {
}
}
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