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A driver for Apache Cassandra 1.2+ that works exclusively with the Cassandra Query Language version 3
(CQL3) and Cassandra's binary protocol.
/*
* Copyright (C) 2012-2015 DataStax 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.datastax.driver.core;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import java.util.*;
/**
* Base class for Tables and Materialized Views metadata.
*/
public abstract class AbstractTableMetadata {
static final Comparator columnMetadataComparator = new Comparator() {
@Override
public int compare(ColumnMetadata c1, ColumnMetadata c2) {
return c1.getName().compareTo(c2.getName());
}
};
static final Predicate isAscending = new Predicate() {
@Override
public boolean apply(ClusteringOrder o) {
return o == ClusteringOrder.ASC;
}
};
protected final KeyspaceMetadata keyspace;
protected final String name;
protected final UUID id;
protected final List partitionKey;
protected final List clusteringColumns;
protected final Map columns;
protected final TableOptionsMetadata options;
protected final List clusteringOrder;
protected final VersionNumber cassandraVersion;
protected AbstractTableMetadata(KeyspaceMetadata keyspace,
String name,
UUID id,
List partitionKey,
List clusteringColumns,
Map columns,
TableOptionsMetadata options,
List clusteringOrder,
VersionNumber cassandraVersion) {
this.keyspace = keyspace;
this.name = name;
this.id = id;
this.partitionKey = partitionKey;
this.clusteringColumns = clusteringColumns;
this.columns = columns;
this.options = options;
this.clusteringOrder = clusteringOrder;
this.cassandraVersion = cassandraVersion;
}
/**
* Returns the name of this table.
*
* @return the name of this CQL table.
*/
public String getName() {
return name;
}
/**
* Returns the unique id of this table.
*
* Note: this id is available in Cassandra 2.1 and above. It will be
* {@code null} for earlier versions.
*
* @return the unique id of the table.
*/
public UUID getId() {
return id;
}
/**
* Returns the keyspace this table belong to.
*
* @return the keyspace metadata of the keyspace this table belong to.
*/
public KeyspaceMetadata getKeyspace() {
return keyspace;
}
/**
* Returns metadata on a column of this table.
*
* @param name the name of the column to retrieve ({@code name} will be
* interpreted as a case-insensitive identifier unless enclosed in double-quotes,
* see {@link Metadata#quote}).
* @return the metadata for the column if it exists, or
* {@code null} otherwise.
*/
public ColumnMetadata getColumn(String name) {
return columns.get(Metadata.handleId(name));
}
/**
* Returns a list containing all the columns of this table.
*
* The order of the columns in the list is consistent with
* the order of the columns returned by a {@code SELECT * FROM thisTable}:
* the first column is the partition key, next are the clustering
* columns in their defined order, and then the rest of the
* columns follow in alphabetic order.
*
* @return a list containing the metadata for the columns of this table.
*/
public List getColumns() {
return new ArrayList(columns.values());
}
/**
* Returns the list of columns composing the primary key for this table.
*
* A table will always at least have a partition key (that
* may itself be one or more columns), so the returned list at least
* has one element.
*
* @return the list of columns composing the primary key for this table.
*/
public List getPrimaryKey() {
List pk = new ArrayList(partitionKey.size() + clusteringColumns.size());
pk.addAll(partitionKey);
pk.addAll(clusteringColumns);
return pk;
}
/**
* Returns the list of columns composing the partition key for this table.
*
* A table always has a partition key so the returned list has
* at least one element.
*
* @return the list of columns composing the partition key for this table.
*/
public List getPartitionKey() {
return Collections.unmodifiableList(partitionKey);
}
/**
* Returns the list of clustering columns for this table.
*
* @return the list of clustering columns for this table.
* If there is no clustering columns, an empty list is returned.
*/
public List getClusteringColumns() {
return Collections.unmodifiableList(clusteringColumns);
}
/**
* Returns the clustering order for this table.
*
* The returned contains the clustering order of each clustering column. The
* {@code i}th element of the result correspond to the order (ascending or
* descending) of the {@code i}th clustering column (see
* {@link #getClusteringColumns}). Note that a table defined without any
* particular clustering order is equivalent to one for which all the
* clustering keys are in ascending order.
*
* @return a list with the clustering order for each clustering column.
*/
public List getClusteringOrder() {
return clusteringOrder;
}
/**
* Returns the options for this table.
*
* @return the options for this table.
*/
public TableOptionsMetadata getOptions() {
return options;
}
void add(ColumnMetadata column) {
columns.put(column.getName(), column);
}
/**
* Returns a {@code String} containing CQL queries representing this
* table and the index on it.
*
* In other words, this method returns the queries that would allow you to
* recreate the schema of this table, along with the indexes and views defined on
* this table, if any.
*
* Note that the returned String is formatted to be human readable (for
* some definition of human readable at least).
*
* @return the CQL queries representing this table schema as a {code
* String}.
*/
public String exportAsString() {
StringBuilder sb = new StringBuilder();
sb.append(asCQLQuery(true));
return sb.toString();
}
/**
* Returns a CQL query representing this table.
*
* This method returns a single 'CREATE TABLE' query with the options
* corresponding to this table definition.
*
* Note that the returned string is a single line; the returned query
* is not formatted in any way.
*
* @return the 'CREATE TABLE' query corresponding to this table.
* @see #exportAsString
*/
public String asCQLQuery() {
return asCQLQuery(false);
}
protected abstract String asCQLQuery(boolean formatted);
protected StringBuilder appendOptions(StringBuilder sb, boolean formatted) {
// Options
sb.append(" WITH ");
if (options.isCompactStorage())
and(sb.append("COMPACT STORAGE"), formatted);
if (!Iterables.all(clusteringOrder, isAscending))
and(appendClusteringOrder(sb), formatted);
sb.append("read_repair_chance = ").append(options.getReadRepairChance());
and(sb, formatted).append("dclocal_read_repair_chance = ").append(options.getLocalReadRepairChance());
if (cassandraVersion.getMajor() < 2 || (cassandraVersion.getMajor() == 2 && cassandraVersion.getMinor() == 0))
and(sb, formatted).append("replicate_on_write = ").append(options.getReplicateOnWrite());
and(sb, formatted).append("gc_grace_seconds = ").append(options.getGcGraceInSeconds());
and(sb, formatted).append("bloom_filter_fp_chance = ").append(options.getBloomFilterFalsePositiveChance());
if (cassandraVersion.getMajor() < 2 || cassandraVersion.getMajor() == 2 && cassandraVersion.getMinor() < 1)
and(sb, formatted).append("caching = '").append(options.getCaching().get("keys")).append('\'');
else
and(sb, formatted).append("caching = ").append(formatOptionMap(options.getCaching()));
if (options.getComment() != null)
and(sb, formatted).append("comment = '").append(options.getComment().replace("'", "''")).append('\'');
and(sb, formatted).append("compaction = ").append(formatOptionMap(options.getCompaction()));
and(sb, formatted).append("compression = ").append(formatOptionMap(options.getCompression()));
if (cassandraVersion.getMajor() >= 2) {
and(sb, formatted).append("default_time_to_live = ").append(options.getDefaultTimeToLive());
and(sb, formatted).append("speculative_retry = '").append(options.getSpeculativeRetry()).append('\'');
if (options.getIndexInterval() != null)
and(sb, formatted).append("index_interval = ").append(options.getIndexInterval());
}
if (cassandraVersion.getMajor() > 2 || (cassandraVersion.getMajor() == 2 && cassandraVersion.getMinor() >= 1)) {
and(sb, formatted).append("min_index_interval = ").append(options.getMinIndexInterval());
and(sb, formatted).append("max_index_interval = ").append(options.getMaxIndexInterval());
}
if (cassandraVersion.getMajor() > 2) {
and(sb, formatted).append("crc_check_chance = ").append(options.getCrcCheckChance());
}
sb.append(';');
return sb;
}
@Override
public String toString() {
return asCQLQuery();
}
private StringBuilder appendClusteringOrder(StringBuilder sb) {
sb.append("CLUSTERING ORDER BY (");
for (int i = 0; i < clusteringColumns.size(); i++) {
if (i > 0) sb.append(", ");
sb.append(clusteringColumns.get(i).getName()).append(' ').append(clusteringOrder.get(i));
}
return sb.append(')');
}
private static String formatOptionMap(Map m) {
StringBuilder sb = new StringBuilder();
sb.append("{ ");
boolean first = true;
for (Map.Entry entry : m.entrySet()) {
if (first) first = false;
else sb.append(", ");
sb.append('\'').append(entry.getKey()).append('\'');
sb.append(" : ");
try {
sb.append(Integer.parseInt(entry.getValue()));
} catch (NumberFormatException e) {
sb.append('\'').append(entry.getValue()).append('\'');
}
}
sb.append(" }");
return sb.toString();
}
private StringBuilder and(StringBuilder sb, boolean formatted) {
return newLine(sb, formatted).append(spaces(2, formatted)).append(" AND ");
}
static String spaces(int n, boolean formatted) {
if (!formatted)
return "";
StringBuilder sb = new StringBuilder();
for (int i = 0; i < n; i++)
sb.append(' ');
return sb.toString();
}
static StringBuilder newLine(StringBuilder sb, boolean formatted) {
if (formatted)
sb.append('\n');
return sb;
}
static StringBuilder spaceOrNewLine(StringBuilder sb, boolean formatted) {
sb.append(formatted ? '\n' : ' ');
return sb;
}
}