| /* |
| * 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.DataInputStream; |
| import java.io.IOException; |
| |
| import org.apache.tomcat.util.bcel.Constants; |
| import org.apache.tomcat.util.bcel.util.BCELComparator; |
| |
| /** |
| * This class represents the field info structure, i.e., the representation |
| * for a variable in the class. See JVM specification for details. |
| * |
| * @version $Id: Field.java,v 1.1 2011/06/28 21:08:23 rherrmann Exp $ |
| * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A> |
| */ |
| public final class Field extends FieldOrMethod { |
| |
| private static final long serialVersionUID = 2646214544240375238L; |
| private static BCELComparator _cmp = new BCELComparator() { |
| |
| @Override |
| public boolean equals( Object o1, Object o2 ) { |
| Field THIS = (Field) o1; |
| Field THAT = (Field) o2; |
| return THIS.getName().equals(THAT.getName()) |
| && THIS.getSignature().equals(THAT.getSignature()); |
| } |
| |
| |
| @Override |
| public int hashCode( Object o ) { |
| Field THIS = (Field) o; |
| return THIS.getSignature().hashCode() ^ THIS.getName().hashCode(); |
| } |
| }; |
| |
| |
| /** |
| * Construct object from file stream. |
| * @param file Input stream |
| */ |
| Field(DataInputStream file, ConstantPool constant_pool) throws IOException, |
| ClassFormatException { |
| super(file, constant_pool); |
| } |
| |
| |
| /** |
| * @return constant value associated with this field (may be null) |
| */ |
| public final ConstantValue getConstantValue() { |
| for (int i = 0; i < attributes_count; i++) { |
| if (attributes[i].getTag() == Constants.ATTR_CONSTANT_VALUE) { |
| return (ConstantValue) attributes[i]; |
| } |
| } |
| return null; |
| } |
| |
| |
| /** |
| * Return string representation close to declaration format, |
| * `public static final short MAX = 100', e.g.. |
| * |
| * @return String representation of field, including the signature. |
| */ |
| @Override |
| public final String toString() { |
| String name, signature, access; // Short cuts to constant pool |
| // Get names from constant pool |
| access = Utility.accessToString(access_flags); |
| access = access.equals("") ? "" : (access + " "); |
| signature = Utility.signatureToString(getSignature()); |
| name = getName(); |
| StringBuffer buf = new StringBuffer(64); |
| buf.append(access).append(signature).append(" ").append(name); |
| ConstantValue cv = getConstantValue(); |
| if (cv != null) { |
| buf.append(" = ").append(cv); |
| } |
| for (int i = 0; i < attributes_count; i++) { |
| Attribute a = attributes[i]; |
| if (!(a instanceof ConstantValue)) { |
| buf.append(" [").append(a.toString()).append("]"); |
| } |
| } |
| return buf.toString(); |
| } |
| |
| |
| /** |
| * Return value as defined by given BCELComparator strategy. |
| * By default two Field objects are said to be equal when |
| * their names and signatures are equal. |
| * |
| * @see java.lang.Object#equals(java.lang.Object) |
| */ |
| @Override |
| public boolean equals( Object obj ) { |
| return _cmp.equals(this, obj); |
| } |
| |
| |
| /** |
| * Return value as defined by given BCELComparator strategy. |
| * By default return the hashcode of the field's name XOR signature. |
| * |
| * @see java.lang.Object#hashCode() |
| */ |
| @Override |
| public int hashCode() { |
| return _cmp.hashCode(this); |
| } |
| } |