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/*******************************************************************************
* Copyright (c) 2011 Vrije Universiteit Brussel.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* Contributors:
* Dennis Wagelaar, Vrije Universiteit Brussel - initial API and
* implementation and/or initial documentation
*******************************************************************************/
package org.eclipse.m2m.atl.emftvm.util;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.eclipse.emf.ecore.EClassifier;
import org.eclipse.m2m.atl.emftvm.Field;
/**
* Reusable class for storage and lookup of {@link Field}s.
* @author <a href="mailto:dennis.wagelaar@vub.ac.be">Dennis Wagelaar</a>
*/
public final class FieldContainer {
/**
* Lookup table for fields: (name -> (context -> field)).
*/
protected final Map<String, TypeMap<Object, Field>> fields =
new HashMap<String, TypeMap<Object,Field>>();
/**
* Lookup table for static fields: (name -> (context -> field)).
*/
protected final Map<String, TypeMap<Object, Field>> staticFields =
new HashMap<String, TypeMap<Object,Field>>();
/**
* Set of all fields (for clearing values).
*/
protected final Set<Field> allFields = new HashSet<Field>();
/**
* Registers f in the corresponding lookup table.
* @param f the field to register
*/
public void registerField(final Field f) {
f.clear();
if (f.isStatic()) {
registerFieldIn(f, staticFields);
} else {
registerFieldIn(f, fields);
}
allFields.add(f);
}
/**
* Registers f in the corresponding lookup table.
* @param f the field to register
*/
private static void registerFieldIn(final Field f, final Map<String, TypeMap<Object, Field>> reg) {
final String name = f.getName();
TypeMap<Object, Field> fieldreg;
fieldreg = reg.get(name);
if (fieldreg == null) {
fieldreg = new TypeHashMap<Object, Field>();
reg.put(name, fieldreg);
}
final EClassifier ectx = f.getEContext();
assert ectx != null;
final Object ctx = EMFTVMUtil.getRegistryType(ectx);
fieldreg.put(ctx, f);
}
/**
* Finds the corresponding field for <pre>name</pre> and <pre>context</pre>.
* @param context the context type of the field
* @param name the name of the field
* @return the corresponding field, or <code>null</code> if not found
* @throws DuplicateEntryException if there is a field conflict
*/
public Field findField(final Object context, final String name) throws DuplicateEntryException {
final TypeMap<Object, Field> fieldreg = fields.get(name);
if (fieldreg != null) {
// First try to find with direct type
Field f = fieldreg.get(context);
// Fall back to full resolving algorithm
if (f == null) {
final Object ctxKey = fieldreg.findKey(context);
if (ctxKey != null) {
f = fieldreg.get(ctxKey);
assert f != null;
// Now register directly under context type
fieldreg.put(context, f);
}
}
return f;
} else {
return null;
}
}
/**
* Returns <code>true</code> iff this execution environment has any registered
* fields with the given <code>name</code>.
* @param name the field name
* @return <code>true</code> iff this execution environment has any registered
* fields with the given <code>name</code>
*/
public boolean hasField(final String name) {
return fields.containsKey(name);
}
/**
* Finds the corresponding static field for <pre>name</pre> and <pre>context</pre>.
* @param context the context type of the field
* @param name the name of the field
* @return the corresponding field, or <code>null</code> if not found
* @throws DuplicateEntryException if there is a field conflict
*/
public Field findStaticField(Object context, String name) throws DuplicateEntryException {
final TypeMap<Object, Field> fieldreg = staticFields.get(name);
if (fieldreg != null) {
// Static fields must be defined in exact context type
return fieldreg.get(context);
} else {
return null;
}
}
/**
* Returns <code>true</code> iff this execution environment has any registered
* static fields with the given <code>name</code>.
* @param name the field name
* @return <code>true</code> iff this execution environment has any registered
* static fields with the given <code>name</code>
*/
public boolean hasStaticField(final String name) {
return staticFields.containsKey(name);
}
/**
* Clears the values of all registered fields.
*/
public void clear() {
for (Field f : allFields) {
f.clear();
}
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return "FieldContainer [fields=" + fields + ", staticFields="
+ staticFields + "]";
}
}
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