Package org.apache.bcel.generic
Class ConstantPoolGen
- java.lang.Object
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- org.apache.bcel.generic.ConstantPoolGen
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public class ConstantPoolGen extends Object
This class is used to build up a constant pool. The user adds constants via `addXXX' methods, `addString', `addClass', etc.. These methods return an index into the constant pool. Finally, `getFinalConstantPool()' returns the constant pool built up. Intermediate versions of the constant pool can be obtained with `getConstantPool()'. A constant pool has capacity for Constants.MAX_SHORT entries. Note that the first (0) is used by the JVM and that Double and Long constants need two slots.- See Also:
Constant
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Field Summary
Fields Modifier and Type Field Description protected Constant[]
constants
Deprecated.(since 6.0) will be made private; do not access directly, use getter/setterprotected int
index
Deprecated.(since 6.0) will be made private; do not access directly, use getSize()protected int
size
Deprecated.(since 6.0) will be made private; do not access directly, use getter/setter
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Constructor Summary
Constructors Constructor Description ConstantPoolGen()
Create empty constant pool.ConstantPoolGen(Constant[] cs)
Initialize with given array of constants.ConstantPoolGen(ConstantPool cp)
Initialize with given constant pool.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
addArrayClass(ArrayType type)
Add a reference to an array class (e.g.int
addClass(String str)
Add a new Class reference to the ConstantPool, if it is not already in there.int
addClass(ObjectType type)
Add a new Class reference to the ConstantPool for a given type.int
addConstant(Constant c, ConstantPoolGen cp)
Import constant from another ConstantPool and return new index.int
addDouble(double n)
Add a new double constant to the ConstantPool, if it is not already in there.int
addFieldref(String class_name, String field_name, String signature)
Add a new Fieldref constant to the ConstantPool, if it is not already in there.int
addFloat(float n)
Add a new Float constant to the ConstantPool, if it is not already in there.int
addInteger(int n)
Add a new Integer constant to the ConstantPool, if it is not already in there.int
addInterfaceMethodref(String class_name, String method_name, String signature)
Add a new InterfaceMethodref constant to the ConstantPool, if it is not already in there.int
addInterfaceMethodref(MethodGen method)
int
addLong(long n)
Add a new long constant to the ConstantPool, if it is not already in there.int
addMethodref(String class_name, String method_name, String signature)
Add a new Methodref constant to the ConstantPool, if it is not already in there.int
addMethodref(MethodGen method)
int
addNameAndType(String name, String signature)
Add a new NameAndType constant to the ConstantPool if it is not already in there.int
addString(String str)
Add a new String constant to the ConstantPool, if it is not already in there.int
addUtf8(String n)
Add a new Utf8 constant to the ConstantPool, if it is not already in there.protected void
adjustSize()
Resize internal array of constants.Constant
getConstant(int i)
ConstantPool
getConstantPool()
ConstantPool
getFinalConstantPool()
int
getSize()
int
lookupClass(String str)
Look for ConstantClass in ConstantPool named `str'.int
lookupDouble(double n)
Look for ConstantDouble in ConstantPool.int
lookupFieldref(String class_name, String field_name, String signature)
Look for ConstantFieldref in ConstantPool.int
lookupFloat(float n)
Look for ConstantFloat in ConstantPool.int
lookupInteger(int n)
Look for ConstantInteger in ConstantPool.int
lookupInterfaceMethodref(String class_name, String method_name, String signature)
Look for ConstantInterfaceMethodref in ConstantPool.int
lookupInterfaceMethodref(MethodGen method)
int
lookupLong(long n)
Look for ConstantLong in ConstantPool.int
lookupMethodref(String class_name, String method_name, String signature)
Look for ConstantMethodref in ConstantPool.int
lookupMethodref(MethodGen method)
int
lookupNameAndType(String name, String signature)
Look for ConstantNameAndType in ConstantPool.int
lookupString(String str)
Look for ConstantString in ConstantPool containing String `str'.int
lookupUtf8(String n)
Look for ConstantUtf8 in ConstantPool.void
setConstant(int i, Constant c)
Use with care!String
toString()
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Field Detail
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size
@Deprecated protected int size
Deprecated.(since 6.0) will be made private; do not access directly, use getter/setter
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constants
@Deprecated protected Constant[] constants
Deprecated.(since 6.0) will be made private; do not access directly, use getter/setter
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index
@Deprecated protected int index
Deprecated.(since 6.0) will be made private; do not access directly, use getSize()
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Constructor Detail
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ConstantPoolGen
public ConstantPoolGen(Constant[] cs)
Initialize with given array of constants.- Parameters:
cs
- array of given constants, new ones will be appended
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ConstantPoolGen
public ConstantPoolGen(ConstantPool cp)
Initialize with given constant pool.
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ConstantPoolGen
public ConstantPoolGen()
Create empty constant pool.
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Method Detail
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adjustSize
protected void adjustSize()
Resize internal array of constants.
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lookupString
public int lookupString(String str)
Look for ConstantString in ConstantPool containing String `str'.- Parameters:
str
- String to search for- Returns:
- index on success, -1 otherwise
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addString
public int addString(String str)
Add a new String constant to the ConstantPool, if it is not already in there.- Parameters:
str
- String to add- Returns:
- index of entry
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lookupClass
public int lookupClass(String str)
Look for ConstantClass in ConstantPool named `str'.- Parameters:
str
- String to search for- Returns:
- index on success, -1 otherwise
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addClass
public int addClass(String str)
Add a new Class reference to the ConstantPool, if it is not already in there.- Parameters:
str
- Class to add- Returns:
- index of entry
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addClass
public int addClass(ObjectType type)
Add a new Class reference to the ConstantPool for a given type.- Parameters:
type
- Class to add- Returns:
- index of entry
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addArrayClass
public int addArrayClass(ArrayType type)
Add a reference to an array class (e.g. String[][]) as needed by MULTIANEWARRAY instruction, e.g. to the ConstantPool.- Parameters:
type
- type of array class- Returns:
- index of entry
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lookupInteger
public int lookupInteger(int n)
Look for ConstantInteger in ConstantPool.- Parameters:
n
- integer number to look for- Returns:
- index on success, -1 otherwise
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addInteger
public int addInteger(int n)
Add a new Integer constant to the ConstantPool, if it is not already in there.- Parameters:
n
- integer number to add- Returns:
- index of entry
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lookupFloat
public int lookupFloat(float n)
Look for ConstantFloat in ConstantPool.- Parameters:
n
- Float number to look for- Returns:
- index on success, -1 otherwise
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addFloat
public int addFloat(float n)
Add a new Float constant to the ConstantPool, if it is not already in there.- Parameters:
n
- Float number to add- Returns:
- index of entry
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lookupUtf8
public int lookupUtf8(String n)
Look for ConstantUtf8 in ConstantPool.- Parameters:
n
- Utf8 string to look for- Returns:
- index on success, -1 otherwise
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addUtf8
public int addUtf8(String n)
Add a new Utf8 constant to the ConstantPool, if it is not already in there.- Parameters:
n
- Utf8 string to add- Returns:
- index of entry
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lookupLong
public int lookupLong(long n)
Look for ConstantLong in ConstantPool.- Parameters:
n
- Long number to look for- Returns:
- index on success, -1 otherwise
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addLong
public int addLong(long n)
Add a new long constant to the ConstantPool, if it is not already in there.- Parameters:
n
- Long number to add- Returns:
- index of entry
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lookupDouble
public int lookupDouble(double n)
Look for ConstantDouble in ConstantPool.- Parameters:
n
- Double number to look for- Returns:
- index on success, -1 otherwise
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addDouble
public int addDouble(double n)
Add a new double constant to the ConstantPool, if it is not already in there.- Parameters:
n
- Double number to add- Returns:
- index of entry
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lookupNameAndType
public int lookupNameAndType(String name, String signature)
Look for ConstantNameAndType in ConstantPool.- Parameters:
name
- of variable/methodsignature
- of variable/method- Returns:
- index on success, -1 otherwise
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addNameAndType
public int addNameAndType(String name, String signature)
Add a new NameAndType constant to the ConstantPool if it is not already in there.- Parameters:
name
- Name string to addsignature
- signature string to add- Returns:
- index of entry
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lookupMethodref
public int lookupMethodref(String class_name, String method_name, String signature)
Look for ConstantMethodref in ConstantPool.- Parameters:
class_name
- Where to find methodmethod_name
- Guess whatsignature
- return and argument types- Returns:
- index on success, -1 otherwise
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lookupMethodref
public int lookupMethodref(MethodGen method)
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addMethodref
public int addMethodref(String class_name, String method_name, String signature)
Add a new Methodref constant to the ConstantPool, if it is not already in there.- Parameters:
class_name
- class name string to addmethod_name
- method name string to addsignature
- method signature string to add- Returns:
- index of entry
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addMethodref
public int addMethodref(MethodGen method)
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lookupInterfaceMethodref
public int lookupInterfaceMethodref(String class_name, String method_name, String signature)
Look for ConstantInterfaceMethodref in ConstantPool.- Parameters:
class_name
- Where to find methodmethod_name
- Guess whatsignature
- return and argument types- Returns:
- index on success, -1 otherwise
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lookupInterfaceMethodref
public int lookupInterfaceMethodref(MethodGen method)
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addInterfaceMethodref
public int addInterfaceMethodref(String class_name, String method_name, String signature)
Add a new InterfaceMethodref constant to the ConstantPool, if it is not already in there.- Parameters:
class_name
- class name string to addmethod_name
- method name string to addsignature
- signature string to add- Returns:
- index of entry
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addInterfaceMethodref
public int addInterfaceMethodref(MethodGen method)
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lookupFieldref
public int lookupFieldref(String class_name, String field_name, String signature)
Look for ConstantFieldref in ConstantPool.- Parameters:
class_name
- Where to find methodfield_name
- Guess whatsignature
- return and argument types- Returns:
- index on success, -1 otherwise
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addFieldref
public int addFieldref(String class_name, String field_name, String signature)
Add a new Fieldref constant to the ConstantPool, if it is not already in there.- Parameters:
class_name
- class name string to addfield_name
- field name string to addsignature
- signature string to add- Returns:
- index of entry
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getConstant
public Constant getConstant(int i)
- Parameters:
i
- index in constant pool- Returns:
- constant pool entry at index i
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setConstant
public void setConstant(int i, Constant c)
Use with care!- Parameters:
i
- index in constant poolc
- new constant pool entry at index i
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getConstantPool
public ConstantPool getConstantPool()
- Returns:
- intermediate constant pool
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getSize
public int getSize()
- Returns:
- current size of constant pool
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getFinalConstantPool
public ConstantPool getFinalConstantPool()
- Returns:
- constant pool with proper length
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toString
public String toString()
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addConstant
public int addConstant(Constant c, ConstantPoolGen cp)
Import constant from another ConstantPool and return new index.
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