/*
 * Copyright (c) 2007, 2017, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.tools.javap;

import com.sun.tools.classfile.Annotation;
import com.sun.tools.classfile.TypeAnnotation;
import com.sun.tools.classfile.Annotation.Annotation_element_value;
import com.sun.tools.classfile.Annotation.Array_element_value;
import com.sun.tools.classfile.Annotation.Class_element_value;
import com.sun.tools.classfile.Annotation.Enum_element_value;
import com.sun.tools.classfile.Annotation.Primitive_element_value;
import com.sun.tools.classfile.ConstantPool;
import com.sun.tools.classfile.ConstantPoolException;
import com.sun.tools.classfile.Descriptor;
import com.sun.tools.classfile.Descriptor.InvalidDescriptor;

 A writer for writing annotations as text.
 
This is NOT part of any supported API.
 If you write code that depends on this, you do so at your own risk.
 This code and its internal interfaces are subject to change or
 deletion without notice.
/**
 *  A writer for writing annotations as text.
 *
 *  <p><b>This is NOT part of any supported API.
 *  If you write code that depends on this, you do so at your own risk.
 *  This code and its internal interfaces are subject to change or
 *  deletion without notice.</b>
 */
public class AnnotationWriter extends BasicWriter {
    static AnnotationWriter instance(Context context) {
        AnnotationWriter instance = context.get(AnnotationWriter.class);
        if (instance == null)
            instance = new AnnotationWriter(context);
        return instance;
    }

    protected AnnotationWriter(Context context) {
        super(context);
        classWriter = ClassWriter.instance(context);
        constantWriter = ConstantWriter.instance(context);
    }

    public void write(Annotation annot) {
        write(annot, false);
        println();
        indent(+1);
        write(annot, true);
        indent(-1);
    }

    public void write(Annotation annot, boolean resolveIndices) {
        writeDescriptor(annot.type_index, resolveIndices);
        if (resolveIndices) {
            boolean showParens = annot.num_element_value_pairs > 0;
            if (showParens) {
                println("(");
                indent(+1);
            }
            for (int i = 0; i < annot.num_element_value_pairs; i++) {
                write(annot.element_value_pairs[i], true);
                println();
            }
            if (showParens) {
                indent(-1);
                print(")");
            }
        } else {
            print("(");
            for (int i = 0; i < annot.num_element_value_pairs; i++) {
                if (i > 0)
                    print(",");
                write(annot.element_value_pairs[i], false);
            }
            print(")");
        }
    }

    public void write(TypeAnnotation annot) {
        write(annot, true, false);
        println();
        indent(+1);
        write(annot.annotation, true);
        indent(-1);
    }

    public void write(TypeAnnotation annot, boolean showOffsets, boolean resolveIndices) {
        write(annot.annotation, resolveIndices);
        print(": ");
        write(annot.position, showOffsets);
    }

    public void write(TypeAnnotation.Position pos, boolean showOffsets) {
        print(pos.type);

        switch (pos.type) {
        // instanceof
        case INSTANCEOF:
        // new expression
        case NEW:
        // constructor/method reference receiver
        case CONSTRUCTOR_REFERENCE:
        case METHOD_REFERENCE:
            if (showOffsets) {
                print(", offset=");
                print(pos.offset);
            }
            break;
        // local variable
        case LOCAL_VARIABLE:
        // resource variable
        case RESOURCE_VARIABLE:
            if (pos.lvarOffset == null) {
                print(", lvarOffset is Null!");
                break;
            }
            print(", {");
            for (int i = 0; i < pos.lvarOffset.length; ++i) {
                if (i != 0) print("; ");
                if (showOffsets) {
                    print("start_pc=");
                    print(pos.lvarOffset[i]);
                }
                print(", length=");
                print(pos.lvarLength[i]);
                print(", index=");
                print(pos.lvarIndex[i]);
            }
            print("}");
            break;
        // exception parameter
        case EXCEPTION_PARAMETER:
            print(", exception_index=");
            print(pos.exception_index);
            break;
        // method receiver
        case METHOD_RECEIVER:
            // Do nothing
            break;
        // type parameter
        case CLASS_TYPE_PARAMETER:
        case METHOD_TYPE_PARAMETER:
            print(", param_index=");
            print(pos.parameter_index);
            break;
        // type parameter bound
        case CLASS_TYPE_PARAMETER_BOUND:
        case METHOD_TYPE_PARAMETER_BOUND:
            print(", param_index=");
            print(pos.parameter_index);
            print(", bound_index=");
            print(pos.bound_index);
            break;
        // class extends or implements clause
        case CLASS_EXTENDS:
            print(", type_index=");
            print(pos.type_index);
            break;
        // throws
        case THROWS:
            print(", type_index=");
            print(pos.type_index);
            break;
        // method parameter
        case METHOD_FORMAL_PARAMETER:
            print(", param_index=");
            print(pos.parameter_index);
            break;
        // type cast
        case CAST:
        // method/constructor/reference type argument
        case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT:
        case METHOD_INVOCATION_TYPE_ARGUMENT:
        case CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT:
        case METHOD_REFERENCE_TYPE_ARGUMENT:
            if (showOffsets) {
                print(", offset=");
                print(pos.offset);
            }
            print(", type_index=");
            print(pos.type_index);
            break;
        // We don't need to worry about these
        case METHOD_RETURN:
        case FIELD:
            break;
        case UNKNOWN:
            throw new AssertionError("AnnotationWriter: UNKNOWN target type should never occur!");
        default:
            throw new AssertionError("AnnotationWriter: Unknown target type for position: " + pos);
        }

        // Append location data for generics/arrays.
        if (!pos.location.isEmpty()) {
            print(", location=");
            print(pos.location);
        }
    }

    public void write(Annotation.element_value_pair pair, boolean resolveIndices) {
        writeIndex(pair.element_name_index, resolveIndices);
        print("=");
        write(pair.value, resolveIndices);
    }

    public void write(Annotation.element_value value) {
        write(value, false);
        println();
        indent(+1);
        write(value, true);
        indent(-1);
    }

    public void write(Annotation.element_value value, boolean resolveIndices) {
        ev_writer.write(value, resolveIndices);
    }

    private void writeDescriptor(int index, boolean resolveIndices) {
        if (resolveIndices) {
            try {
                ConstantPool constant_pool = classWriter.getClassFile().constant_pool;
                Descriptor d = new Descriptor(index);
                print(d.getFieldType(constant_pool));
                return;
            } catch (ConstantPoolException | InvalidDescriptor ignore) {
            }
        }

        print("#" + index);
    }

    private void writeIndex(int index, boolean resolveIndices) {
        if (resolveIndices) {
            print(constantWriter.stringValue(index));
        } else
            print("#" + index);
    }

    element_value_Writer ev_writer = new element_value_Writer();

    class element_value_Writer implements Annotation.element_value.Visitor<Void,Boolean> {
        public void write(Annotation.element_value value, boolean resolveIndices) {
            value.accept(this, resolveIndices);
        }

        @Override
        public Void visitPrimitive(Primitive_element_value ev, Boolean resolveIndices) {
            if (resolveIndices) {
                int index = ev.const_value_index;
                switch (ev.tag) {
                    case 'B':
                        print("(byte) ");
                        print(constantWriter.stringValue(index));
                        break;
                    case 'C':
                        print("'");
                        print(constantWriter.charValue(index));
                        print("'");
                        break;
                    case 'D':
                    case 'F':
                    case 'I':
                    case 'J':
                        print(constantWriter.stringValue(index));
                        break;
                    case 'S':
                        print("(short) ");
                        print(constantWriter.stringValue(index));
                        break;
                    case 'Z':
                        print(constantWriter.booleanValue(index));
                        break;
                    case 's':
                        print("\"");
                        print(constantWriter.stringValue(index));
                        print("\"");
                        break;
                    default:
                        print(((char) ev.tag) + "#" + ev.const_value_index);
                        break;
                }
            } else {
                print(((char) ev.tag) + "#" + ev.const_value_index);
            }
            return null;
        }

        @Override
        public Void visitEnum(Enum_element_value ev, Boolean resolveIndices) {
            if (resolveIndices) {
                writeIndex(ev.type_name_index, resolveIndices);
                print(".");
                writeIndex(ev.const_name_index, resolveIndices);
            } else {
                print(((char) ev.tag) + "#" + ev.type_name_index + ".#" + ev.const_name_index);
            }
            return null;
        }

        @Override
        public Void visitClass(Class_element_value ev, Boolean resolveIndices) {
            if (resolveIndices) {
                print("class ");
                writeIndex(ev.class_info_index, resolveIndices);
            } else {
                print(((char) ev.tag) + "#" + ev.class_info_index);
            }
            return null;
        }

        @Override
        public Void visitAnnotation(Annotation_element_value ev, Boolean resolveIndices) {
            print((char) ev.tag);
            AnnotationWriter.this.write(ev.annotation_value, resolveIndices);
            return null;
        }

        @Override
        public Void visitArray(Array_element_value ev, Boolean resolveIndices) {
            print("[");
            for (int i = 0; i < ev.num_values; i++) {
                if (i > 0)
                    print(",");
                write(ev.values[i], resolveIndices);
            }
            print("]");
            return null;
        }

    }

    private final ClassWriter classWriter;
    private final ConstantWriter constantWriter;
}