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Java Source Code / Java Documentation » Byte Code » Cojen » org.cojen.classfile 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.cojen.classfile.ConstantPool

ConstantPool
public class ConstantPool (Code)
This class corresponds to the constant_pool structure as defined in section 4.4 of The Java Virtual Machine Specification.

ConstantPool entries are not written out in the order in which they were added to it. Instead, their ordering is changed such that String, Integer and Float constants are written out first. This provides a slight optimization for referencing these constants from a code attribute. It means that Opcode.LDC will more likely be used (one-byte index) than Opcode.LDC_W (two-byte index).
author:
   Brian S O'Neill
See Also:   Opcode




Constructor Summary
 ConstantPool()
    

Method Summary
public  ConstantInfoaddConstant(ConstantInfo constant)
     Will only insert into the pool if the constant is not already in the pool.
public  ConstantClassInfoaddConstantClass(String className)
     Get or create a constant from the constant pool representing a class.
public  ConstantClassInfoaddConstantClass(String className, int dim)
     Get or create a constant from the constant pool representing an array class.
public  ConstantClassInfoaddConstantClass(TypeDesc type)
     Get or create a constant from the constant pool representing a class.
public  ConstantMethodInfoaddConstantConstructor(String className, TypeDesc[] params)
     Get or create a constant from the constant pool representing a constructor in any class.
public  ConstantDoubleInfoaddConstantDouble(double value)
     Get or create a constant double from the constant pool.
public  ConstantFieldInfoaddConstantField(String className, String fieldName, TypeDesc type)
     Get or create a constant from the constant pool representing a field in any class.
public  ConstantFloatInfoaddConstantFloat(float value)
     Get or create a constant float from the constant pool.
public  ConstantIntegerInfoaddConstantInteger(int value)
     Get or create a constant integer from the constant pool.
public  ConstantInterfaceMethodInfoaddConstantInterfaceMethod(String className, String methodName, TypeDesc ret, TypeDesc[] params)
     Get or create a constant from the constant pool representing an interface method in any interface.
public  ConstantLongInfoaddConstantLong(long value)
     Get or create a constant long from the constant pool.
public  ConstantMethodInfoaddConstantMethod(String className, String methodName, TypeDesc ret, TypeDesc[] params)
     Get or create a constant from the constant pool representing a method in any class.
public  ConstantNameAndTypeInfoaddConstantNameAndType(String name, Descriptor type)
     Get or create a constant name and type structure from the constant pool.
public  ConstantNameAndTypeInfoaddConstantNameAndType(ConstantUTFInfo nameConstant, ConstantUTFInfo descConstant)
     Get or create a constant name and type structure from the constant pool.
public  ConstantStringInfoaddConstantString(String str)
     Get or create a constant string from the constant pool.
public  ConstantUTFInfoaddConstantUTF(String str)
     Get or create a constant UTF string from the constant pool.
public  SetgetAllConstants()
     Returns all the constants in the pool, in no particular order.
public  ConstantInfogetConstant(int index)
     Returns a constant from the pool by index, or null if not found.
public  intgetSize()
     Returns the number of constants in the pool.
public static  ConstantPoolreadFrom(DataInput din)
    
public  voidwriteTo(DataOutput dout)
    


Constructor Detail
ConstantPool
ConstantPool()(Code)




Method Detail
addConstant
public ConstantInfo addConstant(ConstantInfo constant)(Code)
Will only insert into the pool if the constant is not already in the pool. The actual constant in the pool.



addConstantClass
public ConstantClassInfo addConstantClass(String className)(Code)
Get or create a constant from the constant pool representing a class.



addConstantClass
public ConstantClassInfo addConstantClass(String className, int dim)(Code)
Get or create a constant from the constant pool representing an array class.
Parameters:
  dim - Number of array dimensions.



addConstantClass
public ConstantClassInfo addConstantClass(TypeDesc type)(Code)
Get or create a constant from the constant pool representing a class.



addConstantConstructor
public ConstantMethodInfo addConstantConstructor(String className, TypeDesc[] params)(Code)
Get or create a constant from the constant pool representing a constructor in any class.



addConstantDouble
public ConstantDoubleInfo addConstantDouble(double value)(Code)
Get or create a constant double from the constant pool.



addConstantField
public ConstantFieldInfo addConstantField(String className, String fieldName, TypeDesc type)(Code)
Get or create a constant from the constant pool representing a field in any class.



addConstantFloat
public ConstantFloatInfo addConstantFloat(float value)(Code)
Get or create a constant float from the constant pool.



addConstantInteger
public ConstantIntegerInfo addConstantInteger(int value)(Code)
Get or create a constant integer from the constant pool.



addConstantInterfaceMethod
public ConstantInterfaceMethodInfo addConstantInterfaceMethod(String className, String methodName, TypeDesc ret, TypeDesc[] params)(Code)
Get or create a constant from the constant pool representing an interface method in any interface.



addConstantLong
public ConstantLongInfo addConstantLong(long value)(Code)
Get or create a constant long from the constant pool.



addConstantMethod
public ConstantMethodInfo addConstantMethod(String className, String methodName, TypeDesc ret, TypeDesc[] params)(Code)
Get or create a constant from the constant pool representing a method in any class. If the method returns void, set ret to null.



addConstantNameAndType
public ConstantNameAndTypeInfo addConstantNameAndType(String name, Descriptor type)(Code)
Get or create a constant name and type structure from the constant pool.



addConstantNameAndType
public ConstantNameAndTypeInfo addConstantNameAndType(ConstantUTFInfo nameConstant, ConstantUTFInfo descConstant)(Code)
Get or create a constant name and type structure from the constant pool.



addConstantString
public ConstantStringInfo addConstantString(String str)(Code)
Get or create a constant string from the constant pool.



addConstantUTF
public ConstantUTFInfo addConstantUTF(String str)(Code)
Get or create a constant UTF string from the constant pool.



getAllConstants
public Set getAllConstants()(Code)
Returns all the constants in the pool, in no particular order.



getConstant
public ConstantInfo getConstant(int index)(Code)
Returns a constant from the pool by index, or null if not found. If this constant pool has not yet been written or was not created by the read method, indexes are not assigned, and an IllegalStateException is thrown.
throws:
  ArrayIndexOutOfBoundsException - if index is out of range.
throws:
  IllegalStateException - if indexes are not assigned



getSize
public int getSize()(Code)
Returns the number of constants in the pool.



readFrom
public static ConstantPool readFrom(DataInput din) throws IOException(Code)



writeTo
public void writeTo(DataOutput dout) throws IOException(Code)



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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