Class ConstantPool
- java.lang.Object
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- org.apache.tomcat.util.bcel.classfile.ConstantPool
 
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 public class ConstantPool extends java.lang.ObjectThis class represents the constant pool, i.e., a table of constants, of a parsed classfile. It may contain null references, due to the JVM specification that skips an entry after an 8-byte constant (double, long) entry. Those interested in generating constant pools programmatically should see ConstantPoolGen.- See Also:
- Constant
 
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Method SummaryAll Methods Instance Methods Concrete Methods Modifier and Type Method Description <T extends Constant>
 TgetConstant(int index)Gets constant from constant pool.<T extends Constant>
 TgetConstant(int index, byte tag)Gets constant from constant pool and check whether it has the expected type.<T extends Constant>
 TgetConstant(int index, java.lang.Class<T> castTo)Gets constant from constant pool.ConstantIntegergetConstantInteger(int index)Gets constant from constant pool and check whether it has the expected type.ConstantUtf8getConstantUtf8(int index)Gets constant from constant pool and check whether it has the expected type.
 
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Method Detail- 
getConstantpublic <T extends Constant> T getConstant(int index) throws ClassFormatException Gets constant from constant pool.- Type Parameters:
- T- A- Constantsubclass
- Parameters:
- index- Index in constant pool
- Returns:
- Constant value
- Throws:
- ClassFormatException- if index is invalid
- See Also:
- Constant
 
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getConstantpublic <T extends Constant> T getConstant(int index, byte tag) throws ClassFormatException Gets constant from constant pool and check whether it has the expected type.- Type Parameters:
- T- A- Constantsubclass
- Parameters:
- index- Index in constant pool
- tag- Tag of expected constant, i.e., its type
- Returns:
- Constant value
- Throws:
- ClassFormatException- if constant type does not match tag
- See Also:
- Constant
 
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getConstantpublic <T extends Constant> T getConstant(int index, java.lang.Class<T> castTo) throws ClassFormatException Gets constant from constant pool.- Type Parameters:
- T- A- Constantsubclass
- Parameters:
- index- Index in constant pool
- castTo- The- Constantsubclass to cast to.
- Returns:
- Constant value
- Throws:
- ClassFormatException- if index is invalid
- See Also:
- Constant
 
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getConstantIntegerpublic ConstantInteger getConstantInteger(int index) Gets constant from constant pool and check whether it has the expected type.- Parameters:
- index- Index in constant pool
- Returns:
- ConstantInteger value
- Throws:
- ClassFormatException- if constant type does not match tag
- See Also:
- ConstantInteger
 
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getConstantUtf8public ConstantUtf8 getConstantUtf8(int index) throws ClassFormatException Gets constant from constant pool and check whether it has the expected type.- Parameters:
- index- Index in constant pool
- Returns:
- ConstantUtf8 value
- Throws:
- ClassFormatException- if constant type does not match tag
- See Also:
- ConstantUtf8
 
 
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