com.amazonaws.mobileconnectors.cognito.Record Maven / Gradle / Ivy
/**
* Copyright 2013-2015 Amazon.com,
* Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Amazon Software License (the "License").
* You may not use this file except in compliance with the
* License. A copy of the License is located at
*
* http://aws.amazon.com/asl/
*
* or in the "license" file accompanying this file. This file is
* distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
* CONDITIONS OF ANY KIND, express or implied. See the License
* for the specific language governing permissions and
* limitations under the License.
*/
package com.amazonaws.mobileconnectors.cognito;
import com.amazonaws.mobileconnectors.cognito.internal.util.StringUtils;
import java.util.Date;
/**
* A Record is the element stored in a {@link Dataset}. There can be up to 1k
* records or up to 1 MB in size in a {@link Dataset}.
*/
public final class Record {
/**
* The key of this record. It's a non empty string.
*/
private final String key;
/**
* The value of this record. If it's null, then the record is considered as
* deleted.
*/
private final String value;
/**
* Equivalent to the version of this record. It's a increasing non negative
* long number. The value is returned from server. Do not set this value
* arbitrarily, or else update may fail.
*/
private final long syncCount;
/**
* The server timestamp of this record when it was last modified.
*/
private final Date lastModifiedDate;
/**
* An identifier of the user or device which modified this record last.
*/
private final String lastModifiedBy;
/**
* The local timestamp of this record when it was last modified.
*/
private final Date deviceLastModifiedDate;
/**
* A flag that indicates whether this record is modified locally but hasn't
* been synced.
*/
private final boolean modified;
/**
* Gets the key of this record. It's a non empty string.
*
* @return key of this record
*/
public String getKey() {
return key;
}
/**
* Gets the value of this record. If it's null, then the record is
* considered as deleted.
*
* @return nullable String value of this record
*/
public String getValue() {
return value;
}
/**
* Gets the sync count of this record. It's equivalent to the version of
* this record. It's a increasing non negative long number. The value is
* returned from server. Do not set this value arbitrarily, or else update
* may fail.
*
* @return sync count of this record
*/
public long getSyncCount() {
return syncCount;
}
/**
* Gets the server timestamp of this record when it was last modified.
*
* @return the server timestamp when it was last modified.
*/
public Date getLastModifiedDate() {
return new Date(lastModifiedDate.getTime());
}
/**
* Gets the identifier of the user or device which modified this record
* last.
*
* @return an identifier of the user or device which made the last
* modification
*/
public String getLastModifiedBy() {
return lastModifiedBy;
}
/**
* Gets the local timestamp of this record when it was last modified.
*
* @return the local timestamp of the device that made the last modification
*/
public Date getDeviceLastModifiedDate() {
return new Date(deviceLastModifiedDate.getTime());
}
/**
* Gets a flag that indicates whether this record is modified locally but
* hasn't been synced.
*
* @return the modified flag of this record
*/
public boolean isModified() {
return modified;
}
/**
* Gets whether the record is marked as deleted. True if value is null,
* false otherwise.
*
* @return true if the record is marked as deleted, false otherwise.
*/
public boolean isDeleted() {
return value == null;
}
/**
* A private constructor for the {@link Builder} to build a new Record
* object.
*
* @param builder a {@link Builder} object
*/
private Record(Builder builder) {
key = builder.key;
value = builder.value;
syncCount = builder.syncCount;
lastModifiedDate = builder.lastModifiedDate == null
? new Date()
: new Date(builder.lastModifiedDate.getTime());
lastModifiedBy = builder.lastModifiedBy;
deviceLastModifiedDate = builder.deviceLastModifiedDate == null
? new Date()
: new Date(builder.deviceLastModifiedDate.getTime());
modified = builder.modified;
}
/**
* A Builder class that helps build an immutable {@link Record} object.
*/
public final static class Builder {
private final String key;
private String value;
private long syncCount;
private Date lastModifiedDate;
private String lastModifiedBy;
private Date deviceLastModifiedDate;
private boolean modified;
/**
* Construct a builder object for the new {@link Record} with given key.
*
* @param key Non empty String key of the record
*/
public Builder(String key) {
if (StringUtils.isEmpty(key)) {
throw new IllegalArgumentException("key can't be empty");
}
this.key = key;
}
/**
* Sets the value of the new {@link Record}. Default is null, aka
* deleted record.
*
* @param value nullable String value of this record
* @return builder itself
*/
public Builder value(String value) {
this.value = value;
return this;
}
/**
* Sets the syncCount of the new {@link Record}. Default is the current
* time.
*
* @param syncCount non negative long value
* @return builder itself
*/
public Builder syncCount(long syncCount) {
if (syncCount < 0) {
throw new IllegalArgumentException("sync count can't be negative");
}
this.syncCount = syncCount;
return this;
}
/**
* Sets the last modified date of this {@link Record}. Default is the
* current time.
*
* @param lastModifiedDate last modified date of this record
* @return builder itself
*/
public Builder lastModifiedDate(Date lastModifiedDate) {
this.lastModifiedDate = lastModifiedDate;
return this;
}
/**
* Sets the last modified by of this {@link Record}. Default is empty
* string.
*
* @param lastModifiedBy device name or user name that last modified
* this record.
* @return builder itself
*/
public Builder lastModifiedBy(String lastModifiedBy) {
this.lastModifiedBy = lastModifiedBy;
return this;
}
/**
* Sets the device last modified date of this {@link Record}. It's the
* local date of the device that modified this record. Default is the
* current date.
*
* @param deviceLastModifiedDate device last modified date
* @return builder itself
*/
public Builder deviceLastModifiedDate(Date deviceLastModifiedDate) {
this.deviceLastModifiedDate = deviceLastModifiedDate;
return this;
}
/**
* Sets whether this {@link Record} has local modification.
*
* @param modified a flag that indicates whether the record has local
* modification
* @return builder itself
*/
public Builder modified(boolean modified) {
this.modified = modified;
return this;
}
/**
* Builds a new {@link Record}.
*
* @return a new {@link Record} object
*/
public Record build() {
return new Record(this);
}
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("key:[").append(key).append("],")
.append("value:[").append(value).append("],")
.append("sync_count:[").append(syncCount).append("],")
.append("last_modified_date:[").append(lastModifiedDate).append("],")
.append("last_modified_by:[").append(lastModifiedBy).append("],")
.append("device_last_modified_date:[").append(deviceLastModifiedDate).append("],")
.append("last_modified_by:[").append(lastModifiedBy).append("],")
.append("is_modified:[").append(modified).append("]");
return sb.toString();
}
}
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