package jdiff;
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import java.io.*;
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import java.util.*;
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/**
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* Track the various modifiers for a program element.
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*
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* The method used for Collection comparison (compareTo) must make its
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* comparison based upon everything that is known about this set of modifiers.
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*
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* See the file LICENSE.txt for copyright details.
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* @author Matthew Doar, mdoar@pobox.com
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*/
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class Modifiers implements Comparable {
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/** Set if the program element is static. */
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public boolean isStatic = false;
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/** Set if the program element is final. */
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public boolean isFinal = false;
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/** Set if the program element is deprecated. */
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public boolean isDeprecated = false;
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/**
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* The visibility level; "public", "protected", "package" or
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* "private"
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*/
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public String visibility = null;
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/** Default constructor. */
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public Modifiers() {
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}
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/** Compare two Modifiers objects by their contents. */
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public int compareTo(Object o) {
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Modifiers oModifiers = (Modifiers)o;
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if (isStatic != oModifiers.isStatic)
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return -1;
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if (isFinal != oModifiers.isFinal)
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return -1;
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if (isDeprecated != oModifiers.isDeprecated)
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return -1;
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if (visibility != null) {
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int comp = visibility.compareTo(oModifiers.visibility);
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if (comp != 0)
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return comp;
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}
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return 0;
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}
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/**
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* Generate a String describing the differences between the current
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* (old) Modifiers object and a new Modifiers object. The string has
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* no leading space, but does end in a period.
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*
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* @param newModifiers The new Modifiers object.
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* @return The description of the differences, null if there is no change.
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*/
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public String diff(Modifiers newModifiers) {
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String res = "";
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boolean hasContent = false;
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if (isStatic != newModifiers.isStatic) {
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res += "Change from ";
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if (isStatic)
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res += "static to non-static.<br>";
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else
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res += "non-static to static.<br>";
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hasContent = true;
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}
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if (isFinal != newModifiers.isFinal) {
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if (hasContent)
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res += " ";
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res += "Change from ";
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if (isFinal)
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res += "final to non-final.<br>";
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else
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res += "non-final to final.<br>";
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hasContent = true;
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}
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if (isDeprecated != newModifiers.isDeprecated) {
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if (hasContent)
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res += " ";
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if (isDeprecated)
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res += "Change from deprecated to undeprecated.<br>";
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else
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res += "<b>Now deprecated</b>.<br>";
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hasContent = true;
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}
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if (visibility != null) {
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int comp = visibility.compareTo(newModifiers.visibility);
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if (comp != 0) {
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if (hasContent)
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res += " ";
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res += "Change of visibility from " + visibility + " to " +
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newModifiers.visibility + ".<br>";
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hasContent = true;
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}
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}
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if (res.compareTo("") == 0)
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return null;
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return res;
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}
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}
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