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package org.aspectj.apache.bcel.classfile;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import org.aspectj.apache.bcel.Constants;
public class AttributeUtils {
public static Attribute[] readAttributes(DataInputStream dataInputstream, ConstantPool cpool) {
try {
int length = dataInputstream.readUnsignedShort();
if (length == 0) {
return Attribute.NoAttributes;
}
Attribute[] attrs = new Attribute[length];
for (int i = 0; i < length; i++) {
attrs[i] = Attribute.readAttribute(dataInputstream, cpool);
}
return attrs;
} catch (IOException e) {
throw new ClassFormatException("IOException whilst reading set of attributes: " + e.toString());
}
}
/** Write (serialize) a set of attributes into a specified output stream */
public static void writeAttributes(Attribute[] attributes, DataOutputStream file) throws IOException {
if (attributes == null) {
file.writeShort(0);
} else {
file.writeShort(attributes.length);
for (Attribute attribute : attributes) {
attribute.dump(file);
}
}
}
public static Signature getSignatureAttribute(Attribute[] attributes) {
for (Attribute attribute : attributes) {
if (attribute.tag == Constants.ATTR_SIGNATURE) {
return (Signature) attribute;
}
}
return null;
}
public static Code getCodeAttribute(Attribute[] attributes) {
for (Attribute attribute : attributes) {
if (attribute.tag == Constants.ATTR_CODE) {
return (Code) attribute;
}
}
return null;
}
public static ExceptionTable getExceptionTableAttribute(Attribute[] attributes) {
for (Attribute attribute : attributes) {
if (attribute.tag == Constants.ATTR_EXCEPTIONS) {
return (ExceptionTable) attribute;
}
}
return null;
}
public static ConstantValue getConstantValueAttribute(Attribute[] attributes) {
for (Attribute attribute : attributes) {
if (attribute.getTag() == Constants.ATTR_CONSTANT_VALUE) {
return (ConstantValue) attribute;
}
}
return null;
}
public static void accept(Attribute[] attributes, ClassVisitor visitor) {
for (Attribute attribute : attributes) {
attribute.accept(visitor);
}
}
public static boolean hasSyntheticAttribute(Attribute[] attributes) {
for (Attribute attribute : attributes) {
if (attribute.tag == Constants.ATTR_SYNTHETIC) {
return true;
}
}
return false;
}
public static SourceFile getSourceFileAttribute(Attribute[] attributes) {
for (Attribute attribute : attributes) {
if (attribute.tag == Constants.ATTR_SOURCE_FILE) {
return (SourceFile) attribute;
}
}
return null;
}
}
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