signatureparser.java

对xml很好的java处理引擎,编译中绑定xml

/*
Copyright (c) 2007, Dennis M. Sosnoski
All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
 * Neither the name of JiBX nor the names of its contributors may be used
   to endorse or promote products derived from this software without specific
   prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

package org.jibx.ws.wsdl;

/**
 * Pull parser for generic method or field signature.
 */
public class SignatureParser
{
    //
    // Signature events
    public static final int END_EVENT = 0;
    public static final int TYPE_EVENT = 1;
    public static final int METHOD_PARAMETERS_START_EVENT = 2;
    public static final int METHOD_PARAMETERS_END_EVENT = 3;
    public static final int TYPE_PARAMETERS_START_EVENT = 4;
    public static final int TYPE_PARAMETERS_END_EVENT = 5;
    
    //
    // Common types
    private static final String STRING_SIGNATURE = "java/lang/String;";
    private static final String STRING_TYPE = "java.lang.String";
    private static final String OBJECT_SIGNATURE = "java/lang/Object;";
    private static final String OBJECT_TYPE = "java.lang.Object";
    
    //
    // Instance data
    private final String m_signature;
    private int m_offset;
    private int m_event;
    private boolean m_isPrimitive;
    private boolean m_isParameterized;
    private String m_type;
    
    /**
     * Constructor.
     * 
     * @param sig signature attribute value
     */
    public SignatureParser(String sig) {
        if (sig.startsWith("Signature(") && sig.endsWith(")")) {
            m_signature = sig.substring(10, sig.length()-1);
            m_event = -1;
        } else {
            throw new IllegalArgumentException("Internal error: not a valid Signature");
        }
    }
    
    /**
     * Check if type is parameterized. It is an error to call this if the
     * current event is not {@link #TYPE_EVENT}.
     *
     * @return <code>true</code> if parameterized type
     */
    public boolean isParameterized() {
        if (m_event == TYPE_EVENT) {
            return m_isParameterized;
        } else {
            throw new IllegalStateException("Internal error: not at TYPE_EVENT");
        }
    }

    /**
     * Check if type is a primitive. It is an error to call this if the
     * current event is not {@link #TYPE_EVENT}.
     *
     * @return <code>true</code> if primitive type
     */
    public boolean isPrimitive() {
        if (m_event == TYPE_EVENT) {
            return m_isPrimitive;
        } else {
            throw new IllegalStateException("Internal error: not at TYPE_EVENT");
        }
    }

    /**
     * Get current event.
     *
     * @return event
     */
    public int getEvent() {
        return m_event;
    }

    /**
     * Get type. It is an error to call this if the current event is not
     * {@link #TYPE_EVENT}.
     *
     * @return type
     */
    public String getType() {
        if (m_event == TYPE_EVENT) {
            return m_type;
        } else {
            throw new IllegalStateException("Internal error: not at TYPE_EVENT");
        }
    }

    /**
     * Get next parse event.
     *
     * @return event
     */
    public int next() {
        if (m_event == END_EVENT) {
            throw new IllegalStateException("Internal error: cannot advance parser");
        } else if (m_offset >= m_signature.length()) {
            m_event = END_EVENT;
        } else {
            
            // assume next event is a primitive type, then correct if necessary
            m_event = TYPE_EVENT;
            m_isPrimitive = true;
            m_isParameterized = false;
            char chr = m_signature.charAt(m_offset++);
            switch (chr) {
                
                // blocking start/end characters
                
                case '(':
                    m_event = METHOD_PARAMETERS_START_EVENT;
                    break;
                    
                case ')':
                    m_event = METHOD_PARAMETERS_END_EVENT;
                    break;
                    
                case '<':
                    m_event = TYPE_PARAMETERS_START_EVENT;
                    break;
                    
                case '>':
                    m_event = TYPE_PARAMETERS_END_EVENT;
                    if (m_offset < m_signature.length() &&
                        m_signature.charAt(m_offset) == ';') {
                        m_offset++;
                    }
                    break;
                
                // primitive type indication characters
                
                case 'B':
                    m_type = "byte";
                    break;
                    
                case 'C':
                    m_type = "char";
                    break;
                    
                case 'D':
                    m_type = "double";
                    break;
                    
                case 'F':
                    m_type = "float";
                    break;
                    
                case 'I':
                    m_type = "int";
                    break;
                    
                case 'J':
                    m_type = "long";
                    break;
                    
                case 'S':
                    m_type = "short";
                    break;
                    
                case 'V':
                    m_type = "void";
                    break;
                    
                case 'Z':
                    m_type = "boolean";
                    break;
                    
                // object type
                    
                case 'L':
                {
                    m_isPrimitive = false;
                    if (m_signature.startsWith(STRING_SIGNATURE, m_offset)) {
                        m_offset += STRING_SIGNATURE.length();
                        m_type = STRING_TYPE;
                    } else if (m_signature.startsWith(OBJECT_SIGNATURE, m_offset)) {
                        m_offset += OBJECT_SIGNATURE.length();
                        m_type = OBJECT_TYPE;
                    } else {
                        StringBuffer buff = new StringBuffer();
                        boolean done = false;
                        while (m_offset < m_signature.length()) {
                            chr = m_signature.charAt(m_offset++);
                            if (chr == '/') {
                                buff.append('.');
                            } else if (chr == ';') {
                                done = true;
                                break;
                            } else if (chr == '<') {
                                done = true;
                                m_offset--;
                                m_isParameterized = true;
                                break;
                            } else {
                                buff.append(chr);
                            }
                        }
                        if (!done) {
                            throw new IllegalStateException("Internal error: cannot interpret type");
                        } else {
                            m_type = buff.toString();
                        }
                    }
                    break;
                }
                    
                // error if anything else
                
                default:
                    throw new IllegalStateException("Internal error: signature parse state");
                    
            }
        }
        return m_event;
    }
}