    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 *  Unless required by applicable law or agreed to in writing, software
    012 *  distributed under the License is distributed on an "AS IS" BASIS,
    013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 *  See the License for the specific language governing permissions and
    015 *  limitations under the License.
    016 */
    017package org.apache.bcel.classfile;
    018
    019import java.io.DataInput;
    020import java.io.DataOutputStream;
    021import java.io.IOException;
    022import java.util.ArrayList;
    023import java.util.Collections;
    024import java.util.List;
    025
    026/**
    027 * represents one parameter annotation in the parameter annotation table
    028 *
    029 * @since 6.0
    030 */
    031public class ParameterAnnotationEntry implements Node {
    032
    033    static final ParameterAnnotationEntry[] EMPTY_ARRAY = {};
    034
    035    public static ParameterAnnotationEntry[] createParameterAnnotationEntries(final Attribute[] attributes) {
    036        if (attributes == null) {
    037            return EMPTY_ARRAY;
    038        }
    039        // Find attributes that contain parameter annotation data
    040        final List<ParameterAnnotationEntry> accumulatedAnnotations = new ArrayList<>(attributes.length);
    041        for (final Attribute attribute : attributes) {
    042            if (attribute instanceof ParameterAnnotations) {
    043                final ParameterAnnotations runtimeAnnotations = (ParameterAnnotations) attribute;
    044                final ParameterAnnotationEntry[] parameterAnnotationEntries = runtimeAnnotations.getParameterAnnotationEntries();
    045                if (parameterAnnotationEntries != null) {
    046                    Collections.addAll(accumulatedAnnotations, parameterAnnotationEntries);
    047                }
    048            }
    049        }
    050        return accumulatedAnnotations.toArray(EMPTY_ARRAY);
    051    }
    052
    053    private final AnnotationEntry[] annotationTable;
    054
    055    /**
    056     * Constructs object from input stream.
    057     *
    058     * @param input Input stream
    059     * @throws IOException if an I/O error occurs.
    060     */
    061    ParameterAnnotationEntry(final DataInput input, final ConstantPool constantPool) throws IOException {
    062        final int annotationTableLength = input.readUnsignedShort();
    063        annotationTable = new AnnotationEntry[annotationTableLength];
    064        for (int i = 0; i < annotationTableLength; i++) {
    065            // TODO isRuntimeVisible
    066            annotationTable[i] = AnnotationEntry.read(input, constantPool, false);
    067        }
    068    }
    069
    070    /**
    071     * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class.
    072     * I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
    073     *
    074     * @param v Visitor object
    075     */
    076    @Override
    077    public void accept(final Visitor v) {
    078        v.visitParameterAnnotationEntry(this);
    079    }
    080
    081    public void dump(final DataOutputStream dos) throws IOException {
    082        dos.writeShort(annotationTable.length);
    083        for (final AnnotationEntry entry : annotationTable) {
    084            entry.dump(dos);
    085        }
    086    }
    087
    088    /**
    089     * returns the array of annotation entries in this annotation
    090     */
    091    public AnnotationEntry[] getAnnotationEntries() {
    092        return annotationTable;
    093    }
    094}