NamespaceStorageSupport.java example

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yangtools-master
/*
 * Copyright (c) 2015 Cisco Systems, Inc. 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
 */
package org.opendaylight.yangtools.yang.parser.stmt.reactor;

import com.google.common.collect.ImmutableMap;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import javax.annotation.Nonnull;
import org.opendaylight.yangtools.yang.common.SimpleDateFormatUtil;
import org.opendaylight.yangtools.yang.model.api.ModuleIdentifier;
import org.opendaylight.yangtools.yang.model.api.meta.IdentifierNamespace;
import org.opendaylight.yangtools.yang.parser.spi.meta.NamespaceBehaviour;
import org.opendaylight.yangtools.yang.parser.spi.meta.NamespaceBehaviour.NamespaceStorageNode;
import org.opendaylight.yangtools.yang.parser.spi.meta.NamespaceNotAvailableException;
import org.opendaylight.yangtools.yang.parser.spi.meta.StatementNamespace;
import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;

abstract class NamespaceStorageSupport implements NamespaceStorageNode {

    private Map<Class<?>, Map<?,?>> namespaces = ImmutableMap.of();

    @Override
    public abstract NamespaceStorageNode getParentNamespaceStorage();

    /**
     * @return registry of source context
     */
    public abstract NamespaceBehaviour.Registry getBehaviourRegistry();

    protected void checkLocalNamespaceAllowed(final Class<? extends IdentifierNamespace<?, ?>> type) {
        // NOOP
    }

    protected <K, V, N extends IdentifierNamespace<K, V>> void onNamespaceElementAdded(final Class<N> type, final K key,
            final V value) {
        // NOOP
    }

    @Nonnull
    public final <K,V, KT extends K, N extends IdentifierNamespace<K, V>> V getFromNamespace(final Class<N> type,
            final KT key) throws NamespaceNotAvailableException {
        return getBehaviourRegistry().getNamespaceBehaviour(type).getFrom(this,key);
    }

    public final <K, V, N extends IdentifierNamespace<K, V>> Map<K, V> getAllFromNamespace(final Class<N> type){
        return getBehaviourRegistry().getNamespaceBehaviour(type).getAllFrom(this);
    }

    @SuppressWarnings("unchecked")
    public final <K, V, N extends IdentifierNamespace<K, V>> Map<K, V> getAllFromCurrentStmtCtxNamespace(
            final Class<N> type) {
        return (Map<K, V>) namespaces.get(type);
    }

    public final <K,V, KT extends K, VT extends V,N extends IdentifierNamespace<K, V>> void addToNs(final Class<N> type,
            final KT key, final VT value) throws NamespaceNotAvailableException {
        getBehaviourRegistry().getNamespaceBehaviour(type).addTo(this,key,value);
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    public final <K, N extends StatementNamespace<K, ?,?>> void addContextToNamespace(final Class<N> type, final K key,
            final StmtContext<?, ?, ?> value) throws NamespaceNotAvailableException {
        getBehaviourRegistry().getNamespaceBehaviour((Class)type).addTo(this, key, value);
    }

    @SuppressWarnings("unchecked")
    @Override
    public <K, V, N extends IdentifierNamespace<K, V>> V getFromLocalStorage(final Class<N> type, final K key) {
        final Map<K, V> localNamespace = (Map<K,V>) namespaces.get(type);

        V potential = null;
        if (localNamespace != null) {
            potential = localNamespace.get(key);
        }

        if (potential == null && isModuleIdentifierWithoutSpecifiedRevision(key)) {
            potential = getRegardlessOfRevision((ModuleIdentifier)key,(Map<ModuleIdentifier,V>)localNamespace);
        }

        return potential;
    }

    private static boolean isModuleIdentifierWithoutSpecifiedRevision(final Object obj) {
        if (!(obj instanceof ModuleIdentifier)) {
            return false;
        }

        final Date rev = ((ModuleIdentifier) obj).getRevision();
        return rev == SimpleDateFormatUtil.DEFAULT_DATE_IMP || rev == SimpleDateFormatUtil.DEFAULT_BELONGS_TO_DATE;
    }

    private static <K, V, N extends IdentifierNamespace<K, V>> V getRegardlessOfRevision(final ModuleIdentifier key,
            final Map<ModuleIdentifier, V> localNamespace) {

        if (localNamespace == null) {
            return null;
        }

        final Set<Entry<ModuleIdentifier, V>> entrySet = localNamespace.entrySet();
        for (final Entry<ModuleIdentifier, V> entry : entrySet) {
            final ModuleIdentifier moduleIdentifierInMap = entry.getKey();
            if (moduleIdentifierInMap.getName().equals(key.getName())) {
                return entry.getValue();
            }
        }

        return null;
    }

    @Override
    public <K, V, N extends IdentifierNamespace<K, V>> Map<K, V> getAllFromLocalStorage(final Class<N> type) {
        @SuppressWarnings("unchecked")
        final Map<K, V> localNamespace = (Map<K, V>) namespaces.get(type);
        return localNamespace;
    }

    private <K, V, N extends IdentifierNamespace<K, V>> Map<K, V> ensureLocalNamespace(final Class<N> type) {
        @SuppressWarnings("unchecked")
        Map<K, V> ret = (Map<K,V>) namespaces.get(type);
        if (ret == null) {
            checkLocalNamespaceAllowed(type);
            ret = new HashMap<>(1);

            if (namespaces.isEmpty()) {
                namespaces = new HashMap<>(1);
            }
            namespaces.put(type, ret);
        }

        return ret;
    }

    @Override
    public <K, V, N extends IdentifierNamespace<K, V>> V putToLocalStorage(final Class<N> type, final K key,
            final V value) {
        final V ret = ensureLocalNamespace(type).put(key, value);
        onNamespaceElementAdded(type, key, value);
        return ret;
    }

    @Override
    public <K, V, N extends IdentifierNamespace<K, V>> V putToLocalStorageIfAbsent(final Class<N> type, final K key,
            final V value) {
        final V ret = ensureLocalNamespace(type).putIfAbsent(key, value);
        if (ret == null) {
            onNamespaceElementAdded(type, key, value);
        }
        return ret;
    }
}