net.sf.lucis.core.impl.SingleSearcherProvider.java Source code

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Here is the source code for net.sf.lucis.core.impl.SingleSearcherProvider.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.sf.lucis.core.impl;

import net.sf.derquinse.lucis.IndexNotAvailableException;
import net.sf.lucis.core.DirectoryProvider;
import net.sf.lucis.core.LucisSearcher;

import org.apache.lucene.index.IndexReader;
import org.apache.lucene.store.Directory;

import com.google.common.base.Preconditions;
import com.google.common.base.Supplier;

public abstract class SingleSearcherProvider implements Supplier<LucisSearcher> {
    public static SingleSearcherProvider of(final Directory directory) {
        Preconditions.checkNotNull(directory);
        return new SingleSearcherProvider() {
            @Override
            Directory directory() {
                return directory;
            }
        };
    }

    public static SingleSearcherProvider of(final DirectoryProvider provider) {
        Preconditions.checkNotNull(provider);
        return new SingleSearcherProvider() {
            @Override
            Directory directory() {
                return provider.getDirectory();
            }
        };
    }

    private SingleSearcherProvider() {
    }

    abstract Directory directory();

    public LucisSearcher get() {
        try {
            Directory d = directory();
            if (!IndexReader.indexExists(d)) {
                d = EmptyDirectory.get();
            }
            final IndexReader reader = IndexReader.open(d);
            return new DefaultLucisSearcher(reader);
        } catch (Exception e) {
            throw new IndexNotAvailableException(e);
        }
    }
}