documents.Document.java Source code

Introduction

Here is the source code for documents.Document.java

Source

/*
 * Copyright (c) 2016 Chris Bellis
 * This software is subject to the MIT License, see LICENSE.txt in the root of the repository.
 */

package documents;

import com.google.common.hash.HashFunction;
import com.google.common.hash.Hasher;
import com.google.common.hash.Hashing;

import java.nio.charset.Charset;
import java.util.*;
import java.util.stream.Collectors;

/**
 * Created by chris on 4/8/16.
 */
public abstract class Document {
    private Map<String, String> metadata;

    public Document() {
        metadata = new HashMap<>();
    }

    public Set<String> getMetadataFields() {
        return getAllFields().stream().filter(s -> !hiddenFields().contains(s)).collect(Collectors.toSet());
    }

    public Set<String> getAllFields() {
        return metadata.keySet();
    }

    public String getMetadata(String key) {
        return metadata.get(key);
    }

    public void addMetadata(String key, String value) {
        metadata.put(key, value);
    }

    public abstract String getName();

    public abstract String getContents();

    public abstract List<String> hiddenFields();

    public int hashCode() {
        Hasher hf = Hashing.md5().newHasher();
        metadata.forEach((k, v) -> hf.putString(v, Charset.defaultCharset()));
        return hf.hash().asInt();
    }
}