com.b2international.index.mapping.Mappings.java Source code

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Here is the source code for com.b2international.index.mapping.Mappings.java

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/*
 * Copyright 2011-2016 B2i Healthcare Pte Ltd, http://b2i.sg
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.b2international.index.mapping;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.collect.Maps.newHashMap;

import java.util.Collection;
import java.util.Map;

import com.b2international.index.query.Query;
import com.google.common.collect.HashMultiset;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.collect.Multiset;
import com.google.common.collect.Multiset.Entry;

/**
 * @since 4.7
 */
public final class Mappings {

    private final Map<Class<?>, DocumentMapping> mappingsByType = newHashMap();

    public Mappings(Class<?>... types) {
        this(ImmutableSet.copyOf(types));
    }

    public Mappings(Collection<Class<?>> types) {
        checkArgument(!types.isEmpty(), "At least one document type should be specified");
        final Multiset<String> duplicates = HashMultiset.create();
        for (Class<?> type : ImmutableSet.copyOf(types)) {
            // XXX register only root mappings, nested mappings should be looked up via the parent/ancestor mapping
            DocumentMapping mapping = new DocumentMapping(type);
            mappingsByType.put(type, mapping);
            duplicates.add(mapping.typeAsString());
        }
        for (Entry<String> duplicate : duplicates.entrySet()) {
            if (duplicate.getCount() > 1) {
                throw new IllegalArgumentException(
                        "Multiple Java types with the same document name: " + duplicate.getElement());
            }
        }
    }

    public Collection<DocumentMapping> getMappings() {
        return ImmutableList.copyOf(mappingsByType.values());
    }

    public DocumentMapping getMapping(Class<?> type) {
        checkArgument(mappingsByType.containsKey(type), "Dynamic mapping is not supported: %s", type);
        return mappingsByType.get(type);
    }

    public DocumentMapping getByType(String className) {
        final Collection<DocumentMapping> mappings = Lists.newArrayList();
        for (DocumentMapping mapping : mappingsByType.values()) {
            if (mapping.type().getName().equals(className)) {
                mappings.add(mapping);
            }
        }
        return Iterables.getOnlyElement(mappings);
    }

    public DocumentMapping getDocumentMapping(Query<?> query) {
        if (query.getParentType() != null) {
            return getMapping(query.getParentType()).getNestedMapping(query.getFrom());
        } else {
            return getMapping(query.getFrom());
        }
    }

}