    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 *
    017 */
    018package org.apache.bcel.classfile;
    019
    020import java.io.DataInput;
    021import java.io.DataOutputStream;
    022import java.io.IOException;
    023import java.util.ArrayList;
    024import java.util.Collections;
    025import java.util.List;
    026
    027/**
    028 * represents one parameter annotation in the parameter annotation table
    029 *
    030 * @since 6.0
    031 */
    032public class ParameterAnnotationEntry implements Node {
    033
    034    static final ParameterAnnotationEntry[] EMPTY_ARRAY = {};
    035
    036    public static ParameterAnnotationEntry[] createParameterAnnotationEntries(final Attribute[] attrs) {
    037        // Find attributes that contain parameter annotation data
    038        final List<ParameterAnnotationEntry> accumulatedAnnotations = new ArrayList<>(attrs.length);
    039        for (final Attribute attribute : attrs) {
    040            if (attribute instanceof ParameterAnnotations) {
    041                final ParameterAnnotations runtimeAnnotations = (ParameterAnnotations) attribute;
    042                Collections.addAll(accumulatedAnnotations, runtimeAnnotations.getParameterAnnotationEntries());
    043            }
    044        }
    045        return accumulatedAnnotations.toArray(ParameterAnnotationEntry.EMPTY_ARRAY);
    046    }
    047
    048    private final AnnotationEntry[] annotationTable;
    049
    050    /**
    051     * Construct object from input stream.
    052     *
    053     * @param input Input stream
    054     * @throws IOException if an I/O error occurs.
    055     */
    056    ParameterAnnotationEntry(final DataInput input, final ConstantPool constant_pool) throws IOException {
    057        final int annotation_table_length = input.readUnsignedShort();
    058        annotationTable = new AnnotationEntry[annotation_table_length];
    059        for (int i = 0; i < annotation_table_length; i++) {
    060            // TODO isRuntimeVisible
    061            annotationTable[i] = AnnotationEntry.read(input, constant_pool, false);
    062        }
    063    }
    064
    065    /**
    066     * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class.
    067     * I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
    068     *
    069     * @param v Visitor object
    070     */
    071    @Override
    072    public void accept(final Visitor v) {
    073        v.visitParameterAnnotationEntry(this);
    074    }
    075
    076    public void dump(final DataOutputStream dos) throws IOException {
    077        dos.writeShort(annotationTable.length);
    078        for (final AnnotationEntry entry : annotationTable) {
    079            entry.dump(dos);
    080        }
    081    }
    082
    083    /**
    084     * returns the array of annotation entries in this annotation
    085     */
    086    public AnnotationEntry[] getAnnotationEntries() {
    087        return annotationTable;
    088    }
    089}