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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.tomcat.util.bcel.classfile;
import java.io.DataInput;
import java.io.IOException;
/**
* @author <A HREF="mailto:dbrosius@qis.net">D. Brosius</A>
* @since 6.0
*/
public abstract class ElementValue
{
protected final int type;
protected final ConstantPool cpool;
ElementValue(int type, ConstantPool cpool) {
this.type = type;
this.cpool = cpool;
}
public abstract String stringifyValue();
public static final int STRING = 's';
public static final int ENUM_CONSTANT = 'e';
public static final int CLASS = 'c';
public static final int ANNOTATION = '@';
public static final int ARRAY = '[';
public static final int PRIMITIVE_INT = 'I';
public static final int PRIMITIVE_BYTE = 'B';
public static final int PRIMITIVE_CHAR = 'C';
public static final int PRIMITIVE_DOUBLE = 'D';
public static final int PRIMITIVE_FLOAT = 'F';
public static final int PRIMITIVE_LONG = 'J';
public static final int PRIMITIVE_SHORT = 'S';
public static final int PRIMITIVE_BOOLEAN = 'Z';
public static ElementValue readElementValue(DataInput dis,
ConstantPool cpool) throws IOException
{
byte type = dis.readByte();
switch (type)
{
case 'B': // byte
return new SimpleElementValue(PRIMITIVE_BYTE, dis
.readUnsignedShort(), cpool);
case 'C': // char
return new SimpleElementValue(PRIMITIVE_CHAR, dis
.readUnsignedShort(), cpool);
case 'D': // double
return new SimpleElementValue(PRIMITIVE_DOUBLE, dis
.readUnsignedShort(), cpool);
case 'F': // float
return new SimpleElementValue(PRIMITIVE_FLOAT, dis
.readUnsignedShort(), cpool);
case 'I': // int
return new SimpleElementValue(PRIMITIVE_INT, dis
.readUnsignedShort(), cpool);
case 'J': // long
return new SimpleElementValue(PRIMITIVE_LONG, dis
.readUnsignedShort(), cpool);
case 'S': // short
return new SimpleElementValue(PRIMITIVE_SHORT, dis
.readUnsignedShort(), cpool);
case 'Z': // boolean
return new SimpleElementValue(PRIMITIVE_BOOLEAN, dis
.readUnsignedShort(), cpool);
case 's': // String
return new SimpleElementValue(STRING, dis.readUnsignedShort(),
cpool);
case 'e': // Enum constant
dis.readUnsignedShort(); // Unused type_index
return new EnumElementValue(ENUM_CONSTANT,
dis.readUnsignedShort(), cpool);
case 'c': // Class
return new ClassElementValue(CLASS, dis.readUnsignedShort(), cpool);
case '@': // Annotation
// TODO isRuntimeVisible
return new AnnotationElementValue(ANNOTATION, new AnnotationEntry(
dis, cpool), cpool);
case '[': // Array
int numArrayVals = dis.readUnsignedShort();
ElementValue[] evalues = new ElementValue[numArrayVals];
for (int j = 0; j < numArrayVals; j++)
{
evalues[j] = ElementValue.readElementValue(dis, cpool);
}
return new ArrayElementValue(ARRAY, evalues, cpool);
default:
throw new ClassFormatException(
"Unexpected element value kind in annotation: " + type);
}
}
}
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