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java.lang.Objectcom.flagstone.transform.FSTransformObject
com.flagstone.transform.FSActionObject
com.flagstone.transform.FSTable
public class FSTable
FSTable is used to create a table of string literals that can be referenced by an index rather than using the literal value when executing a sequence of actions.
Variables and built-in functions are specified by their name and the FSTable class contains a table of the respective strings. References to a variable or function can then use its index in the table rather than the name resulting in a more compact representation when the actions are encoded into binary form.
Attributes | |
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type | Identifies the action when it is encoded. Read-only. |
values | An array of up to 65536 strings. |
The use of the FSTable class is illustrated in the following simple expression:
var1 = (var1 + var2) / (var1 - var3);
This can be translated into the following sequence of actions:
FSTable values = new FSTable(); values.add("var1"); values.add("var2"); values.add("var3"); actions.add(values); actions.add(new FSPush(FSTableIndex(0))); // var1 actions.add(FSAction.GetVariable()); actions.add(new FSPush(FSTableIndex(0))); // var1 actions.add(FSAction.GetVariable()); actions.add(new FSPush(FSTableIndex(1))); // var2 actions.add(FSAction.GetVariable()); actions.add(new FSAction(FSAction.Add)); actions.add(new FSPush(FSTableIndex(0))); // var1 actions.add(FSAction.GetVariable()); actions.add(new FSPush(FSTableIndex(2))); // var3 actions.add(FSAction.Subtract()); actions.add(FSAction.Divide()); actions.add(FSAction.SetVariable());
The table in the FSTable class can support up to 65536 different variables. As a result using the FSVariable class to reference the variables in the example above uses one byte rather than the five required to represent the name directly (including the null character terminating the string).
The FSTable stores the strings in an array. No checking for duplicate values is performed.
The FSTable class represents the ActionConstantPool in the Macromedia Flash (SWF) File Format Specification. It was introduced in Flash 5. It was extended in Flash 6 to support tables of up to 65536 strings.
Field Summary |
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Fields inherited from class com.flagstone.transform.FSActionObject |
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Call, ExceptionHandler, GetUrl, GetUrl2, GotoFrame, GotoFrame2, GotoLabel, If, Jump, length, NewFunction, NewFunction2, Push, RegisterCopy, SetTarget, Table, type, WaitForFrame, WaitForFrame2, With |
Constructor Summary | |
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FSTable()
Constructs an empty table. |
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FSTable(java.util.ArrayList anArray)
Constructs an FSTable object using the array of strings. |
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FSTable(FSCoder coder)
Construct an FSTable object, initialising it with values decoded from an encoded object. |
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FSTable(FSTable obj)
Constructs an FSTable object by copying values from an existing object. |
Method Summary | |
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void |
add(java.lang.String aString)
Adds a String to the variable table. |
void |
appendDescription(java.lang.StringBuffer buffer,
int depth)
AppendDescription is used to present a string description of the object including all nested objects up to a specified depth. |
java.lang.Object |
clone()
Creates a deep copy of the entire object. |
void |
decode(FSCoder coder)
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void |
encode(FSCoder coder)
|
boolean |
equals(java.lang.Object anObject)
Returns true if anObject is equal to this one. |
java.util.ArrayList |
getValues()
Gets the array of Strings stored in the variable table. |
int |
length(FSCoder coder)
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void |
setValues(java.util.ArrayList anArray)
Sets the array of Strings stored in the literal table. |
Methods inherited from class com.flagstone.transform.FSActionObject |
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getType, length |
Methods inherited from class com.flagstone.transform.FSTransformObject |
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name, toString |
Methods inherited from class java.lang.Object |
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finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public FSTable(FSCoder coder)
coder
- an FSCoder containing the binary data.public FSTable()
public FSTable(java.util.ArrayList anArray)
anArray
- of Strings that will be added to the table.public FSTable(FSTable obj)
obj
- an FSGotoFrame object.Method Detail |
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public void add(java.lang.String aString)
aString
- a String that will be added to the end of the table.public java.util.ArrayList getValues()
public void setValues(java.util.ArrayList anArray)
anArray
- of Strings that will replaces the existing literal table.public java.lang.Object clone()
FSTransformObject
clone
in class FSTransformObject
public boolean equals(java.lang.Object anObject)
FSActionObject
equals
in class FSActionObject
public void appendDescription(java.lang.StringBuffer buffer, int depth)
FSTransformObject
appendDescription
in class FSTransformObject
buffer
- a StringBuffer to which the description of each object is
appended.depth
- the maximum level of nesting up to which objects will be
displayed.public int length(FSCoder coder)
length
in class FSActionObject
public void encode(FSCoder coder)
encode
in class FSActionObject
public void decode(FSCoder coder)
decode
in class FSActionObject
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