com.google.enterprise.connector.db.diffing.DBHandle.java Source code

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Here is the source code for com.google.enterprise.connector.db.diffing.DBHandle.java

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// Copyright 2011 Google Inc.
//
// 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.google.enterprise.connector.db.diffing;

import com.google.enterprise.connector.spi.Document;
import com.google.enterprise.connector.spi.RepositoryException;
import com.google.enterprise.connector.spi.SpiConstants;
import com.google.enterprise.connector.spi.Value;
import com.google.enterprise.connector.util.diffing.DocumentHandle;

import org.json.JSONException;
import org.json.JSONObject;

import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Backed with a {@link JsonDocument}.
 */
public class DBHandle implements DocumentHandle {
    private static final Logger LOG = Logger.getLogger(DBHandle.class.getName());

    private final JsonDocument document;
    private final String documentId;

    /** Constructs a {@code DocumentHandle} wrapper on a {@code Document}. */
    public DBHandle(JsonDocument jsonDoc) {
        document = jsonDoc;
        documentId = document.getDocumentId();
    }

    /**
     * Reconstructs a {@code DocumentHandle} from a serialized string
     * representation.
     */
    public DBHandle(String jsonString) {
        JSONObject jo;
        try {
            jo = new JSONObject(jsonString);
        } catch (JSONException e) {
            LOG.warning(
                    "Exception thrown while creating JSONObject from string" + jsonString + "\n" + e.toString());
            throw new IllegalArgumentException("Exception thrown for illegal JsonString" + jsonString + "\n", e);
        }
        document = new JsonDocument(jo);
        try {
            documentId = Value.getSingleValueString(document, SpiConstants.PROPNAME_DOCID);
        } catch (RepositoryException e) {
            LOG.warning("Exception thrown while extracting docId for Document" + document + "\n" + e.toString());
            // Thrown to indicate an inappropriate argument has been passed to
            // Value.getSingleValueString() method.
            throw new IllegalArgumentException();
        }
    }

    @Override
    public Document getDocument() throws RepositoryException {
        return document;
    }

    @Override
    public String getDocumentId() {
        return documentId;
    }

    @Override
    public String toString() {
        LOG.log(Level.FINEST, "Serializing document handle for {0}", documentId);
        return document.toJson();
    }
}