Hashtable Java Reference Documentation

CkHashtable

Current Version: 11.0.0

Represents a collection of key/value pairs that are stored in a hash table.

Note: This class was added in Chilkat v9.5.0.51

Object Creation

CkHashtable obj = new CkHashtable();

Properties

Count
int get_Count();
Introduced in version 9.5.0.97

The number of items (strings/integers) contained in the hash table.

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DebugLogFilePath
void get_DebugLogFilePath(CkString str);
String debugLogFilePath();
void put_DebugLogFilePath(String newVal);

If set to a file path, this property logs the LastErrorText of each Chilkat method or property call to the specified file. This logging helps identify the context and history of Chilkat calls leading up to any crash or hang, aiding in debugging.

Enabling the VerboseLogging property provides more detailed information. This property is mainly used for debugging rare instances where a Chilkat method call causes a hang or crash, which should generally not happen.

Possible causes of hangs include:

  • A timeout property set to 0, indicating an infinite timeout.
  • A hang occurring within an event callback in the application code.
  • An internal bug in the Chilkat code causing the hang.

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LastErrorHtml
void get_LastErrorHtml(CkString str);
String lastErrorHtml();

Provides HTML-formatted information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.

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LastErrorText
void get_LastErrorText(CkString str);
String lastErrorText();

Provides plain text information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.

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LastErrorXml
void get_LastErrorXml(CkString str);
String lastErrorXml();

Provides XML-formatted information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.

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LastMethodSuccess
boolean get_LastMethodSuccess();
void put_LastMethodSuccess(boolean newVal);

Indicates the success or failure of the most recent method call: true means success, false means failure. This property remains unchanged by property setters or getters. This method is present to address challenges in checking for null or Nothing returns in certain programming languages.

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VerboseLogging
boolean get_VerboseLogging();
void put_VerboseLogging(boolean newVal);

If set to true, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is false. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.

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Version
void get_Version(CkString str);
String version();

Version of the component/library, such as "10.1.0"

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Methods

AddFromXmlSb
boolean AddFromXmlSb(CkStringBuilder sbXml);
Introduced in version 9.5.0.64

Adds to the hash table from XML previously created by calling ToXmlSb.

Returns true for success, false for failure.

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AddInt
boolean AddInt(String key, int value);
Introduced in version 9.5.0.51

Adds or replaces an entry with the given key and integer value to the hash table. Returns true if a new hash entry was added or replaced. Returns false if an out-of-memory condition occurred.

Returns true for success, false for failure.

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AddQueryParams
boolean AddQueryParams(String queryParams);
Introduced in version 9.5.0.62

Adds URL query parameters into the hashtable. The queryParams has the form: "field1=value1&field2=value2&field3=value3...". It is assumed that the values are URL encoded, and this method automatically URL decodes the values prior to inserting into the hashtable.

Returns true for success, false for failure.

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AddStr
boolean AddStr(String key, String value);
Introduced in version 9.5.0.51

Adds or replaces an entry with the given key and string value to the hash table. Returns true if a new hash entry was added or replaced. Returns false if an out-of-memory condition occurred.

Returns true for success, false for failure.

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Clear
void Clear();
Introduced in version 9.5.0.51

Removes all elements from the Hashtable.

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ClearWithNewCapacity
boolean ClearWithNewCapacity(int capacity);
Introduced in version 9.5.0.51

Removes all elements from the Hashtable and re-sizes with the specified capacity.

The capacity is the number of buckets in the hash table. In the case of a "hash collision", a single bucket stores multiple entries, which must be searched sequentially. One rule of thumb is to set the capacity to twice the number of expected items to be hashed. It's also preferable to set the capacity to a prime number. (The 1st 10,000 prime numbers are listed here: https://primes.utm.edu/lists/small/10000.txt )

The initial default capacity of the hash table is 521.

Returns true for success, false for failure.

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Contains
boolean Contains(String key);
Introduced in version 9.5.0.51

Determines if a given key is contained within the hash table. Returns true if the key exists, otherwise returns false.

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ContainsIntKey
boolean ContainsIntKey(int key);
Introduced in version 9.5.0.64

Determines if a given key is contained within the hash table. Returns true if the key exists, otherwise returns false.

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GetKeys
boolean GetKeys(CkStringTable strTable);
Introduced in version 9.5.0.62

Appends the complete set of hashtable key strings to strTable.

Returns true for success, false for failure.

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LookupInt
int LookupInt(String key);
Introduced in version 9.5.0.51

Returns the integer value associated with the specified key. If the key is not in the hash table, the return value is 0.

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LookupStr
boolean LookupStr(String key, CkString outStr);
String lookupStr(String key);
Introduced in version 9.5.0.51

Returns the string value associated with the specified key.

Returns true for success, false for failure.

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Remove
boolean Remove(String key);
Introduced in version 9.5.0.51

Removes the entry with the specified key from the hash table. Returns true if the key existed and was removed. Returns false if the key did not already exist.

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ToQueryString
boolean ToQueryString(CkString outStr);
String toQueryString();
Introduced in version 9.5.0.92

Serializes the hash table to a query string such as key1=value1&key2=value2&key3=value3 where each value is URL encoded.

Returns true for success, false for failure.

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ToXmlSb
boolean ToXmlSb(CkStringBuilder sbXml);
Introduced in version 9.5.0.64

Serializes the hash table to XML format. The XML is appended to sbXml.

Returns true for success, false for failure.

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