org.apache.james.mailbox.inmemory.mail.InMemoryAnnotationMapper.java Source code

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Here is the source code for org.apache.james.mailbox.inmemory.mail.InMemoryAnnotationMapper.java

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package org.apache.james.mailbox.inmemory.mail;

import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import org.apache.commons.lang.StringUtils;
import org.apache.james.mailbox.exception.MailboxException;
import org.apache.james.mailbox.inmemory.InMemoryId;
import org.apache.james.mailbox.model.MailboxAnnotation;
import org.apache.james.mailbox.model.MailboxAnnotationKey;
import org.apache.james.mailbox.model.MailboxId;
import org.apache.james.mailbox.store.mail.AnnotationMapper;

import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.google.common.base.Predicate;
import com.google.common.collect.HashBasedTable;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.common.collect.Table;

public class InMemoryAnnotationMapper implements AnnotationMapper {
    private final Table<InMemoryId, String, String> mailboxesAnnotations;
    private final ReadWriteLock lock = new ReentrantReadWriteLock();

    public InMemoryAnnotationMapper() {
        mailboxesAnnotations = HashBasedTable.create();
    }

    @Override
    public void endRequest() {

    }

    @Override
    public <T> T execute(Transaction<T> transaction) throws MailboxException {
        return transaction.run();
    }

    private Iterable<MailboxAnnotation> retrieveAllAnnotations(InMemoryId mailboxId) {
        lock.readLock().lock();
        try {
            return Iterables.transform(mailboxesAnnotations.row(mailboxId).entrySet(),
                    new Function<Map.Entry<String, String>, MailboxAnnotation>() {
                        @Override
                        public MailboxAnnotation apply(Entry<String, String> input) {
                            return MailboxAnnotation.newInstance(new MailboxAnnotationKey(input.getKey()),
                                    input.getValue());
                        }
                    });
        } finally {
            lock.readLock().unlock();
        }
    }

    @Override
    public List<MailboxAnnotation> getAllAnnotations(MailboxId mailboxId) {
        return ImmutableList.copyOf(retrieveAllAnnotations((InMemoryId) mailboxId));
    }

    @Override
    public List<MailboxAnnotation> getAnnotationsByKeys(MailboxId mailboxId, final Set<MailboxAnnotationKey> keys) {
        return ImmutableList.copyOf(Iterables.filter(retrieveAllAnnotations((InMemoryId) mailboxId),
                new Predicate<MailboxAnnotation>() {
                    @Override
                    public boolean apply(MailboxAnnotation input) {
                        return keys.contains(input.getKey());
                    }
                }));
    }

    @Override
    public List<MailboxAnnotation> getAnnotationsByKeysWithAllDepth(MailboxId mailboxId,
            final Set<MailboxAnnotationKey> keys) {
        return ImmutableList.copyOf(
                Iterables.filter(retrieveAllAnnotations((InMemoryId) mailboxId), getPredicateFilterByAll(keys)));
    }

    @Override
    public List<MailboxAnnotation> getAnnotationsByKeysWithOneDepth(MailboxId mailboxId,
            final Set<MailboxAnnotationKey> keys) {
        return ImmutableList.copyOf(
                Iterables.filter(getAnnotationsByKeysWithAllDepth(mailboxId, keys), getPredicateFilterByOne(keys)));
    }

    private Predicate<MailboxAnnotation> getPredicateFilterByAll(final Set<MailboxAnnotationKey> keys) {
        return new Predicate<MailboxAnnotation>() {
            @Override
            public boolean apply(final MailboxAnnotation input) {
                return Iterables.tryFind(keys, filterAnnotationsByPrefix(input)).isPresent();
            }
        };
    }

    private Predicate<MailboxAnnotation> getPredicateFilterByOne(final Set<MailboxAnnotationKey> keys) {
        return new Predicate<MailboxAnnotation>() {
            @Override
            public boolean apply(final MailboxAnnotation input) {
                return Iterables.tryFind(keys, filterAnnotationsByParentKey(input.getKey())).isPresent();
            }
        };
    }

    private Predicate<MailboxAnnotationKey> filterAnnotationsByParentKey(final MailboxAnnotationKey input) {
        return new Predicate<MailboxAnnotationKey>() {
            @Override
            public boolean apply(MailboxAnnotationKey key) {
                return input.countComponents() <= (key.countComponents() + 1);
            }
        };
    }

    private Predicate<MailboxAnnotationKey> filterAnnotationsByPrefix(final MailboxAnnotation input) {
        return new Predicate<MailboxAnnotationKey>() {
            @Override
            public boolean apply(MailboxAnnotationKey key) {
                return key.equals(input.getKey())
                        || StringUtils.startsWith(input.getKey().asString(), key.asString() + "/");
            }
        };
    }

    @Override
    public void insertAnnotation(MailboxId mailboxId, MailboxAnnotation mailboxAnnotation) {
        Preconditions.checkArgument(!mailboxAnnotation.isNil());
        lock.writeLock().lock();
        try {
            mailboxesAnnotations.put((InMemoryId) mailboxId, mailboxAnnotation.getKey().asString(),
                    mailboxAnnotation.getValue().get());
        } finally {
            lock.writeLock().unlock();
        }
    }

    @Override
    public void deleteAnnotation(MailboxId mailboxId, MailboxAnnotationKey key) {
        lock.writeLock().lock();
        try {
            mailboxesAnnotations.remove(mailboxId, key.asString());
        } finally {
            lock.writeLock().unlock();
        }
    }

}