/*
 * Copyright (c) 2003, 2013, 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
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 * questions.
 */

package com.sun.tools.javadoc.main;

import com.sun.javadoc.*;

import com.sun.tools.javac.code.Attribute;

import static com.sun.tools.javac.code.TypeTag.BOOLEAN;

Represents a value of an annotation type element.
 
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.
Author:
Scott Seligman
Since:
1.5/**
 * Represents a value of an annotation type element.
 *
 *  <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>
 *
 * @author Scott Seligman
 * @since 1.5
 */

@Deprecated
public class AnnotationValueImpl implements AnnotationValue {

    private final DocEnv env;
    private final Attribute attr;


    AnnotationValueImpl(DocEnv env, Attribute attr) {
        this.env = env;
        this.attr = attr;
    }

    
Returns the value.
The type of the returned object is one of the following:
 a wrapper class for a primitive type
    
 String
    
 Type (representing a class literal)
    
 FieldDoc (representing an enum constant)
    
 AnnotationDesc
    
 AnnotationValue[]

/**
     * Returns the value.
     * The type of the returned object is one of the following:
     * <ul><li> a wrapper class for a primitive type
     *     <li> <code>String</code>
     *     <li> <code>Type</code> (representing a class literal)
     *     <li> <code>FieldDoc</code> (representing an enum constant)
     *     <li> <code>AnnotationDesc</code>
     *     <li> <code>AnnotationValue[]</code>
     * </ul>
     */
    public Object value() {
        ValueVisitor vv = new ValueVisitor();
        attr.accept(vv);
        return vv.value;
    }

    private class ValueVisitor implements Attribute.Visitor {
        public Object value;

        public void visitConstant(Attribute.Constant c) {
            if (c.type.hasTag(BOOLEAN)) {
                // javac represents false and true as integers 0 and 1
                value = Boolean.valueOf(
                                ((Integer)c.value).intValue() != 0);
            } else {
                value = c.value;
            }
        }

        public void visitClass(Attribute.Class c) {
            value = TypeMaker.getType(env,
                                      env.types.erasure(c.classType));
        }

        public void visitEnum(Attribute.Enum e) {
            value = env.getFieldDoc(e.value);
        }

        public void visitCompound(Attribute.Compound c) {
            value = new AnnotationDescImpl(env, c);
        }

        public void visitArray(Attribute.Array a) {
            AnnotationValue vals[] = new AnnotationValue[a.values.length];
            for (int i = 0; i < vals.length; i++) {
                vals[i] = new AnnotationValueImpl(env, a.values[i]);
            }
            value = vals;
        }

        public void visitError(Attribute.Error e) {
            value = "<error>";
        }
    }

    
Returns a string representation of the value.
Returns:
the text of a Java language annotation value expression
         whose value is the value of this annotation type element./**
     * Returns a string representation of the value.
     *
     * @return the text of a Java language annotation value expression
     *          whose value is the value of this annotation type element.
     */
    @Override
    public String toString() {
        ToStringVisitor tv = new ToStringVisitor();
        attr.accept(tv);
        return tv.toString();
    }

    private class ToStringVisitor implements Attribute.Visitor {
        private final StringBuilder sb = new StringBuilder();

        @Override
        public String toString() {
            return sb.toString();
        }

        public void visitConstant(Attribute.Constant c) {
            if (c.type.hasTag(BOOLEAN)) {
                // javac represents false and true as integers 0 and 1
                sb.append(((Integer)c.value).intValue() != 0);
            } else {
                sb.append(FieldDocImpl.constantValueExpression(c.value));
            }
        }

        public void visitClass(Attribute.Class c) {
            sb.append(c);
        }

        public void visitEnum(Attribute.Enum e) {
            sb.append(e);
        }

        public void visitCompound(Attribute.Compound c) {
            sb.append(new AnnotationDescImpl(env, c));
        }

        public void visitArray(Attribute.Array a) {
            // Omit braces from singleton.
            if (a.values.length != 1) sb.append('{');

            boolean first = true;
            for (Attribute elem : a.values) {
                if (first) {
                    first = false;
                } else {
                    sb.append(", ");
                }
                elem.accept(this);
            }
            // Omit braces from singleton.
            if (a.values.length != 1) sb.append('}');
        }

        public void visitError(Attribute.Error e) {
            sb.append("<error>");
        }
    }
}