tostringstyle.java

JAVA 文章管理系统源码

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002-2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgement may appear in the software itself,
 *    if and wherever such third-party acknowledgements normally appear.
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 *    Foundation" must not be used to endorse or promote products derived
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package org.apache.commons.lang.builder;

import java.io.Serializable;
import java.lang.reflect.Array;
import java.util.Collection;
import java.util.Map;

import org.apache.commons.lang.ClassUtils;
import org.apache.commons.lang.ObjectUtils;
import org.apache.commons.lang.SystemUtils;

/**
 * <p>Controls <code>String</code> formatting for {@link ToStringBuilder}.
 * The main public interface is always via <code>ToStringBuilder</code>.</p>
 *
 * <p>These classes are intended to be used as <code>Singletons</code>.
 * There is no need to instantiate a new style each time. A program
 * will generally use one of the predefined constants on this class.
 * Alternatively, the {@link StandardToStringStyle} class can be used
 * to set the individual settings. Thus most styles can be achieved
 * without subclassing.</p>
 *
 * <p>If required, a subclass can override as many or as few of the
 * methods as it requires. Each object type (from <code>boolean</code>
 * to <code>long</code> to <code>Object</code> to <code>int[]</code>) has
 * its own methods to output it. Most have two versions, detail and summary.
 *
 * <p>For example, the detail version of the array based methods will
 * output the whole array, whereas the summary method will just output
 * the array length.</p>
 *
 * @author Stephen Colebourne
 * @author Gary Gregory
 * @author Pete Gieser
 * @since 1.0
 * @version $Id: ToStringStyle.java,v 1.27 2003/08/23 00:21:49 ggregory Exp $
 */
public abstract class ToStringStyle implements Serializable {

    /**
     * The default toString style.
     */
    public static final ToStringStyle DEFAULT_STYLE = new DefaultToStringStyle();
    /**
     * The multi line toString style.
     */
    public static final ToStringStyle MULTI_LINE_STYLE = new MultiLineToStringStyle();
    /**
     * The no field names toString style.
     */
    public static final ToStringStyle NO_FIELD_NAMES_STYLE = new NoFieldNameToStringStyle();
    /**
     * The simple toString style.
     */
    public static final ToStringStyle SIMPLE_STYLE = new SimpleToStringStyle();

    /**
     * Whether to use the field names, the default is <code>true</code>.
     */
    private boolean useFieldNames = true;
    /**
     * Whether to use the class name, the default is <code>true</code>.
     */
    private boolean useClassName = true;
    /**
     * Whether to use short class names, the default is <code>false</code>.
     */
    private boolean useShortClassName = false;
    /**
     * Whether to use the identity hash code, the default is <code>true</code>.
     */
    private boolean useIdentityHashCode = true;

    /**
     * The content start <code>'['</code>.
     */
    private String contentStart = "[";
    /**
     * The content end <code>']'</code>.
     */
    private String contentEnd = "]";
    /**
     * The field name value separator <code>'='</code>.
     */
    private String fieldNameValueSeparator = "=";
    /**
     * Whether the field separator should be added before any other fields.
     */
    private boolean fieldSeparatorAtStart = false;
    /**
     * Whether the field separator should be added after any other fields.
     */
    private boolean fieldSeparatorAtEnd = false;
    /**
     * The field separator <code>','</code>.
     */
    private String fieldSeparator = ",";
    /**
     * The array start <code>'{'</code>.
     */
    private String arrayStart = "{";
    /**
     * The array separator <code>','</code>.
     */
    private String arraySeparator = ",";
    /**
     * The detail for array content.
     */
    private boolean arrayContentDetail = true;
    /**
     * The array end <code>'}'</code>.
     */
    private String arrayEnd = "}";
    /**
     * The value to use when fullDetail is <code>null</code>,
     * the default value is <code>true</code>.
     */
    private boolean defaultFullDetail = true;
    /**
     * The <code>null</code> text <code>'&lt;null&gt;'</code>.
     */
    private String nullText = "<null>";
    /**
     * The summary size text start <code>'<size'</code>.
     */
    private String sizeStartText = "<size=";
    /**
     * The summary size text start <code>'&gt;'</code>.
     */
    private String sizeEndText = ">";
    /**
     * The summary object text start <code>'&lt;'</code>.
     */
    private String summaryObjectStartText = "<";
    /**
     * The summary object text start <code>'&gt;'</code>.
     */
    private String summaryObjectEndText = ">";

    //----------------------------------------------------------------------------

    /**
     * <p>Constructor.</p>
     */
    protected ToStringStyle() {
        super();
    }

    //----------------------------------------------------------------------------

    /**
     * <p>Append to the <code>toString</code> the superclass toString.</p>
     * 
     * <p>A <code>null</code> <code>superToString</code> is ignored.</p>
     * 
     * @param buffer  the <code>StringBuffer</code> to populate
     * @param superToString  the <code>super.toString()</code>
     * @since 2.0
     */
    public void appendSuper(StringBuffer buffer, String superToString) {
        appendToString(buffer, superToString);
    }

    /**
     * <p>Append to the <code>toString</code> another toString.</p>
     * 
     * <p>A <code>null</code> <code>toString</code> is ignored.</p>
     * 
     * @param buffer  the <code>StringBuffer</code> to populate
     * @param toString  the additional <code>toString</code>
     * @since 2.0
     */
    public void appendToString(StringBuffer buffer, String toString) {
        if (toString != null) {
            int pos1 = toString.indexOf(contentStart) + contentStart.length();
            int pos2 = toString.lastIndexOf(contentEnd);
            if (pos1 != pos2 && pos1 >= 0 && pos2 >= 0) {
                String data = toString.substring(pos1, pos2);
                if (fieldSeparatorAtStart) {
                    removeLastFieldSeparator(buffer);
                }
                buffer.append(data);
                appendFieldSeparator(buffer);
            }
        }
    }

    /**
     * <p>Append to the <code>toString</code> the start of data indicator.</p>
     * 
     * @param buffer  the <code>StringBuffer</code> to populate
     * @param object  the <code>Object</code> to build a
     *  <code>toString</code> for, must not be <code>null</code>
     */
    public void appendStart(StringBuffer buffer, Object object) {
        appendClassName(buffer, object);
        appendIdentityHashCode(buffer, object);
        appendContentStart(buffer);
        if (fieldSeparatorAtStart) {
            appendFieldSeparator(buffer);
        }
    }

    /**
     * <p>Append to the <code>toString</code> the end of data indicator.</p>
     * 
     * @param buffer  the <code>StringBuffer</code> to populate
     * @param object  the <code>Object</code> to build a
     *  <code>toString</code> for, must not be <code>null</code>
     */
    public void appendEnd(StringBuffer buffer, Object object) {
        if (fieldSeparatorAtEnd == false) {
            removeLastFieldSeparator(buffer);
        }
        appendContentEnd(buffer);
    }

    /**
     * <p>Remove the last field separator from the buffer.</p>
     * 
     * @param buffer  the <code>StringBuffer</code> to populate
     * @since 2.0
     */
    protected void removeLastFieldSeparator(StringBuffer buffer) {
        int len = buffer.length();
        int sepLen = fieldSeparator.length();
        if (len > 0 && sepLen > 0 && len >= sepLen) {
            boolean match = true;
            for (int i = 0; i < sepLen; i++) {
                if (buffer.charAt(len - 1 - i) != fieldSeparator.charAt(sepLen - 1 - i)) {
                    match = false;
                    break;
                }
            }
            if (match) {
                buffer.setLength(len - sepLen);
            }
        }
    }

    //----------------------------------------------------------------------------

    /**
     * <p>Append to the <code>toString</code> an <code>Object</code>
     * value, printing the full <code>toString</code> of the
     * <code>Object</code> passed in.</p>
     *
     * @param buffer  the <code>StringBuffer</code> to populate
     * @param fieldName  the field name
     * @param value  the value to add to the <code>toString</code>
     * @param fullDetail  <code>true</code> for detail, <code>false</code>
     *  for summary info, <code>null</code> for style decides
     */
    public void append(StringBuffer buffer, String fieldName, Object value, Boolean fullDetail) {
        appendFieldStart(buffer, fieldName);

        if (value == null) {
            appendNullText(buffer, fieldName);

        } else {
            appendInternal(buffer, fieldName, value, isFullDetail(fullDetail));
        }

        appendFieldEnd(buffer, fieldName);
    }

    /**
     * <p>Append to the <code>toString</code> an <code>Object</code>,
     * correctly interpreting its type.</p>
     *
     * <p>This method performs the main lookup by Class type to correctly
     * route arrays, <code>Collections</code>, <code>Maps</code> and
     * <code>Objects</code> to the appropriate method.</p>
     *
     * <p>Either detail or summary views can be specified.</p>
     *
     * <p>If a cycle is detected, an object will be appended with the
     * <code>Object.toString()</code> format.</p>
     *
     * @param buffer  the <code>StringBuffer</code> to populate
     * @param fieldName  the field name, typically not used as already appended
     * @param value  the value to add to the <code>toString</code>,
     *  not <code>null</code>
     * @param detail  output detail or not
     */
    protected void appendInternal(StringBuffer buffer, String fieldName, Object value, boolean detail) {
        if (ReflectionToStringBuilder.isRegistered(value)
            && !(value instanceof Number || value instanceof Boolean || value instanceof Character)) {
            ObjectUtils.appendIdentityToString(buffer, value);

        } else if (value instanceof Collection) {
            if (detail) {
                appendDetail(buffer, fieldName, (Collection) value);
            } else {
                appendSummarySize(buffer, fieldName, ((Collection) value).size());
            }

        } else if (value instanceof Map) {
            if (detail) {
                appendDetail(buffer, fieldName, (Map) value);
            } else {
                appendSummarySize(buffer, fieldName, ((Map) value).size());
            }

        } else if (value instanceof long[]) {
            if (detail) {
                appendDetail(buffer, fieldName, (long[]) value);
            } else {
                appendSummary(buffer, fieldName, (long[]) value);
            }

        } else if (value instanceof int[]) {
            if (detail) {
                appendDetail(buffer, fieldName, (int[]) value);
            } else {
                appendSummary(buffer, fieldName, (int[]) value);
            }

        } else if (value instanceof short[]) {