MethodParameters.java
/*
* 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
*
* https://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.bcel.classfile;
import java.io.DataInput;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.Arrays;
import java.util.Iterator;
import java.util.stream.Stream;
import org.apache.bcel.Const;
/**
* This class represents a MethodParameters attribute.
*
* @see <a href="https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.24"> The class File Format :
* The MethodParameters Attribute</a>
* @since 6.0
*/
public class MethodParameters extends Attribute implements Iterable<MethodParameter> {
/**
* Empty array.
*/
private static final MethodParameter[] EMPTY_ARRAY = {};
private MethodParameter[] parameters = EMPTY_ARRAY;
MethodParameters(final int nameIndex, final int length, final DataInput input, final ConstantPool constantPool) throws IOException {
super(Const.ATTR_METHOD_PARAMETERS, nameIndex, length, constantPool);
final int parameterCount = input.readUnsignedByte();
parameters = new MethodParameter[parameterCount];
for (int i = 0; i < parameterCount; i++) {
parameters[i] = new MethodParameter(input);
}
}
@Override
public void accept(final Visitor v) {
v.visitMethodParameters(this);
}
@Override
public Attribute copy(final ConstantPool constantPool) {
final MethodParameters c = (MethodParameters) clone();
c.parameters = new MethodParameter[parameters.length];
Arrays.setAll(c.parameters, i -> parameters[i].copy());
c.setConstantPool(constantPool);
return c;
}
/**
* Dump method parameters attribute to file stream in binary format.
*
* @param file Output file stream
* @throws IOException if an I/O error occurs.
*/
@Override
public void dump(final DataOutputStream file) throws IOException {
super.dump(file);
file.writeByte(parameters.length);
for (final MethodParameter parameter : parameters) {
parameter.dump(file);
}
}
public MethodParameter[] getParameters() {
return parameters;
}
@Override
public Iterator<MethodParameter> iterator() {
return Stream.of(parameters).iterator();
}
public void setParameters(final MethodParameter[] parameters) {
this.parameters = parameters != null ? parameters : EMPTY_ARRAY;
}
}