org.codehaus.plexus.metadata.ann.AnnReader Maven / Gradle / Ivy

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A Maven plugin to generate Plexus Components descriptors from source javadoc tags and Java class annotations.
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/*
 * Copyright (C) 2008 the original author or authors.
 *
 * Licensed 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.codehaus.plexus.metadata.ann;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;

import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

/**
 * @author Eugene Kuleshov
 */
public class AnnReader extends ClassVisitor {

    private final AnnClass annClass;

    private AnnReader(AnnClass annClass) {
        super(Opcodes.ASM9);
        this.annClass = annClass;
    }

    public static AnnClass read(InputStream is, ClassLoader cl) throws IOException {
        AnnClass annClass = new AnnClass(cl);
        AnnReader cv = new AnnReader(annClass);
        ClassReader r = new ClassReader(is);
        r.accept(cv, ClassReader.SKIP_FRAMES | ClassReader.SKIP_CODE);
        return annClass;
    }

    public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
        annClass.setName(name);
        annClass.setAccess(access);
        annClass.setSuperName(superName);
        annClass.setInterfaces(interfaces);
    }

    public AnnotationVisitor visitAnnotation(final String desc, boolean visible) {
        Ann ann = new Ann(desc);
        annClass.addAnn(ann);
        return new AnnAnnReader(ann);
    }

    public FieldVisitor visitField(int access, final String name, final String desc, String signature, Object value) {
        final AnnField field = new AnnField(annClass, access, name, desc);
        annClass.addField(field);
        return new FieldVisitor(Opcodes.ASM9) {

            public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
                Ann ann = new Ann(desc);
                field.addAnn(ann);
                return new AnnAnnReader(ann);
            }
        };
    }

    public MethodVisitor visitMethod(
            int access, final String mname, final String mdesc, String signature, String[] exceptions) {
        final AnnMethod method = new AnnMethod(annClass, access, mname, mdesc);
        annClass.addMethod(method);

        return new MethodVisitor(Opcodes.ASM9) {

            public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
                Ann ann = new Ann(desc);
                method.addAnn(ann);
                return new AnnAnnReader(ann);
            }

            public AnnotationVisitor visitParameterAnnotation(int parameter, String desc, boolean visible) {
                Ann ann = new Ann(desc);
                method.addParamAnn(parameter, ann);
                return new AnnAnnReader(ann);
            }
        };
    }

    static class AnnAnnReader extends AnnotationVisitor {
        private Ann ann;

        public AnnAnnReader(Ann ann) {
            super(Opcodes.ASM9);
            this.ann = ann;
        }

        public void visit(String name, Object value) {
            ann.addParam(name, value);
        }

        public void visitEnum(String name, String desc, String value) {
            ann.addParam(name, new AnnEnum(desc, value));
        }

        public AnnotationVisitor visitAnnotation(String name, String desc) {
            Ann ann = new Ann(desc);
            this.ann.addParam(name, ann);
            return new AnnAnnReader(ann);
        }

        public AnnotationVisitor visitArray(String name) {
            return new AnnAnnArrayReader(ann, name);
        }
    }

    static class AnnAnnArrayReader extends AnnotationVisitor {

        private Ann ann;

        private String name;

        // TODO good enough for now, but does not cover general case
        private ArrayList array = new ArrayList();

        public AnnAnnArrayReader(Ann ann, String name) {
            super(Opcodes.ASM9);
            this.ann = ann;
            this.name = name;
        }

        public void visit(String name, Object value) {
            if (value instanceof String) {
                array.add((String) value);
            }
        }

        public void visitEnd() {
            ann.addParam(name, array.toArray(new String[array.size()]));
        }
    }
}