// Copyright 2009 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.util.diffing;
import org.json.JSONException;
import org.json.JSONObject;
/**
* Holder Object for a {@link Change} with its associated
* {@link DiffingConnectorCheckpoint}.
*
* @since 2.8
*/
class CheckpointAndChange {
private static final String CHECKPOINT_LABEL = "cp";
private static final String CHANGE_LABEL = "chg";
private final DiffingConnectorCheckpoint checkpoint;
private final Change change;
/**
* Construct a holder object for a {@link Change} with its associated
* {@link DiffingConnectorCheckpoint}.
*
* @param checkpoint
* @param change
*/
CheckpointAndChange(DiffingConnectorCheckpoint checkpoint, Change change) {
if (null == checkpoint) {
throw new IllegalArgumentException("Checkpoint cannot be null.");
}
if (null == change) {
throw new IllegalArgumentException("Change cannot be null.");
}
this.checkpoint = checkpoint;
this.change = change;
}
/**
* Construct a CheckpointAndChange object.
*
* @param json the JSON representation of a DiffingConnectorCheckpoint
* @param internalFactory a DocumentHandleFactory
* @param clientFactory a DocumentHandleFactory
*/
CheckpointAndChange(JSONObject json, DocumentHandleFactory internalFactory,
DocumentHandleFactory clientFactory) throws JSONException {
this.checkpoint = DiffingConnectorCheckpoint.fromJson(
json.getJSONObject(CHECKPOINT_LABEL));
this.change = new Change(json.getJSONObject(CHANGE_LABEL), internalFactory,
clientFactory);
}
/** @return the {@link DiffingConnectorCheckpoint} */
DiffingConnectorCheckpoint getCheckpoint() {
return checkpoint;
}
/** @return the {@link Change} */
Change getChange() {
return change;
}
/** @return the string representation of the JSON object of this instance */
@Override
public String toString() {
return "" + getJson();
}
/** @return this instance as a JSON object */
public JSONObject getJson() {
JSONObject result = new JSONObject();
try {
result.put(CHECKPOINT_LABEL, checkpoint.getJson());
result.put(CHANGE_LABEL, change.getJson());
return result;
} catch (JSONException e) {
// Expected to never occur.
throw new RuntimeException("internal error: failed to create JSON", e);
}
}
@Override
public boolean equals(Object o) {
if (null == o) {
return false;
}
if (this == o) {
return true;
}
if (!(o instanceof CheckpointAndChange)) {
return false;
}
CheckpointAndChange other = (CheckpointAndChange) o;
return this.checkpoint.equals(other.checkpoint)
&& this.change.equals(other.change);
}
@Override
public int hashCode() {
return java.util.Arrays.hashCode(new Object[]{checkpoint, change});
}
}