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/*
* Copyright (C) 2013 The Android Open Source Project
*
* 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.android.providers.contacts.database;
import com.android.providers.contacts.util.NeededForTesting;
import android.database.Cursor;
import android.util.Log;
/**
* Static methods for database operations.
*/
public class MoreDatabaseUtils {
/**
* Builds a CREATE INDEX ddl statement for a given table and field.
*
* @param table The table name.
* @param field The field to index.
* @return The create index sql statement.
*/
public static String buildCreateIndexSql(String table, String field) {
return "CREATE INDEX " + buildIndexName(table, field) + " ON " + table
+ "(" + field + ")";
}
/**
* Builds a DROP INDEX ddl statement for a given table and field.
*
* @param table The table name that was originally used to create the index.
* @param field The field that was originally used to create the index.
* @return The drop index sql statement.
*/
@NeededForTesting
public static String buildDropIndexSql(String table, String field) {
return "DROP INDEX IF EXISTS " + buildIndexName(table, field);
}
/**
* The index is created with a name using the following convention:
* <p>
* [table name]_[field name]_index
*/
public static String buildIndexName(String table, String field) {
return table + "_" + field + "_index";
}
/**
* Build a bind arg where clause.
* <p>
* e.g. Calling this method with value of 4 results in:
* <p>
* "?,?,?,?"
*
* @param numArgs The number of arguments.
* @return A string that can be used for bind args in a sql where clause.
*/
@NeededForTesting
public static String buildBindArgString(int numArgs) {
final StringBuilder sb = new StringBuilder();
String delimiter = "";
for (int i = 0; i < numArgs; i++) {
sb.append(delimiter).append("?");
delimiter = ",";
}
return sb.toString();
}
/** Debug utility that dumps a cursor on logcat. */
public static final void dumpCursor(String logTag, String name, Cursor c) {
Log.d(logTag, "Dumping cursor " + name + " containing " + c.getCount() + " rows");
// Dump the column names.
final StringBuilder sb = new StringBuilder();
for (int i = 0; i < c.getColumnCount(); i++) {
if (sb.length() > 0) sb.append(" ");
sb.append(c.getColumnName(i));
}
Log.d(logTag, sb.toString());
// Dump the values.
c.moveToPosition(-1);
while (c.moveToNext()) {
sb.setLength(0);
sb.append("row#");
sb.append(c.getPosition());
for (int i = 0; i < c.getColumnCount(); i++) {
sb.append(" ");
String s = c.getString(i);
sb.append(s == null ? "{null}" : s.replaceAll("\\s", "{space}"));
}
Log.d(logTag, sb.toString());
}
}
}
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