net.conquiris.schema.SchemaImpl.java Source code

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Here is the source code for net.conquiris.schema.SchemaImpl.java

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/*
 * Copyright (C) the original author or authors.
 *
 * 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 net.conquiris.schema;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

import java.util.Arrays;
import java.util.Map;
import java.util.Set;

import com.google.common.collect.BiMap;
import com.google.common.collect.ForwardingMap;
import com.google.common.collect.ImmutableBiMap;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;

/**
 * Conquiris Lucene document implementation.
 * @author Andres Rodriguez
 */
final class SchemaImpl extends ForwardingMap<String, SchemaItem> implements Schema {
    private final ImmutableBiMap<String, SchemaItem> map;

    /**
     * Constructor.
     * @param map Schema items.
     */
    SchemaImpl(Map<String, SchemaItem> map) {
        this.map = ImmutableBiMap.copyOf(map);
    }

    /*
     * (non-Javadoc)
     * @see com.google.common.collect.ForwardingMap#delegate()
     */
    @Override
    protected BiMap<String, SchemaItem> delegate() {
        return map;
    }

    /*
     * (non-Javadoc)
     * @see com.google.common.collect.BiMap#forcePut(java.lang.Object, java.lang.Object)
     */
    @Override
    public SchemaItem forcePut(String key, SchemaItem value) {
        return delegate().forcePut(key, value);
    }

    /*
     * (non-Javadoc)
     * @see com.google.common.collect.BiMap#inverse()
     */
    @Override
    public BiMap<SchemaItem, String> inverse() {
        return delegate().inverse();
    }

    /*
     * (non-Javadoc)
     * @see com.google.common.collect.BiMap#values()
     */
    @Override
    public Set<SchemaItem> values() {
        return delegate().values();
    }

    private Schema extendWithMap(Map<String, SchemaItem> items) {
        if (items.isEmpty()) {
            return this;
        }
        if (isEmpty()) {
            return new SchemaImpl(items);
        }
        Set<String> intersect = Sets.intersection(map.keySet(), items.keySet());
        checkArgument(intersect.isEmpty(), "Extending with existing keys %s", intersect);
        return putItems(items);
    }

    private Schema putItems(Map<String, SchemaItem> items) {
        final Map<String, SchemaItem> newMap = Maps.newHashMap(map);
        newMap.putAll(items);
        return new SchemaImpl(newMap);
    }

    /*
     * (non-Javadoc)
     * @see net.conquiris.schema.Schema#extend(java.lang.Iterable)
     */
    @Override
    public Schema extend(Iterable<? extends SchemaItem> items) {
        // Never written.
        @SuppressWarnings("unchecked")
        Iterable<SchemaItem> i = (Iterable<SchemaItem>) items;
        Map<String, SchemaItem> others = Maps.uniqueIndex(i, SchemaItem.NAME);
        if (others.isEmpty()) {
            return this;
        }
        return extendWithMap(others);
    }

    /*
     * (non-Javadoc)
     * @see net.conquiris.schema.Schema#extend(net.conquiris.schema.SchemaItem[])
     */
    @Override
    public Schema extend(SchemaItem... items) {
        return extend(Arrays.asList(items));
    }

    /*
     * (non-Javadoc)
     * @see net.conquiris.schema.Schema#extend(net.conquiris.schema.Schema)
     */
    @Override
    public Schema extend(Schema schema) {
        checkNotNull(schema, "The schema must be provided");
        if (isEmpty()) {
            return schema;
        }
        return extendWithMap(schema);
    }

    /*
     * (non-Javadoc)
     * @see net.conquiris.schema.Schema#override(java.lang.Iterable)
     */
    @Override
    public Schema override(Iterable<? extends SchemaItem> items) {
        // Never written.
        @SuppressWarnings("unchecked")
        Iterable<SchemaItem> i = (Iterable<SchemaItem>) items;
        Map<String, SchemaItem> others = Maps.uniqueIndex(i, SchemaItem.NAME);
        if (others.isEmpty()) {
            return this;
        }
        return putItems(others);
    }

    /*
     * (non-Javadoc)
     * @see net.conquiris.schema.Schema#override(net.conquiris.schema.SchemaItem[])
     */
    @Override
    public Schema override(SchemaItem... items) {
        return override(Arrays.asList(items));
    }

    /*
     * (non-Javadoc)
     * @see net.conquiris.schema.Schema#override(net.conquiris.schema.Schema)
     */
    @Override
    public Schema override(Schema schema) {
        checkNotNull(schema, "The schema must be provided");
        if (isEmpty()) {
            return schema;
        }
        if (schema.isEmpty()) {
            return this;
        }
        return putItems(schema);
    }

    /*
     * (non-Javadoc)
     * @see com.google.common.collect.ForwardingMap#hashCode()
     */
    @Override
    public int hashCode() {
        return map.hashCode();
    }

    /*
     * (non-Javadoc)
     * @see com.google.common.collect.ForwardingMap#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object object) {
        if (object instanceof Schema) {
            return map.equals(object);
        }
        return false;
    }

}