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1
22 package org.jboss.ejb.plugins.cmp.jdbc.metadata;
23
24 import org.w3c.dom.Element  ;
25 import org.jboss.metadata.MetaData;
26 import org.jboss.deployment.DeploymentException;
27
28 import java.util.List ;
29 import java.util.Iterator ;
30 import java.util.Collections ;
31 import java.util.ArrayList ;
32
33
42 public final class JDBCLeftJoinMetaData
43 {
44 private final String cmrField;
45 private final String eagerLoadGroup;
46 private final List leftJoinList;
47
48 public static List readLeftJoinList(Iterator leftJoinIterator)
49 throws DeploymentException
50 {
51 List leftJoinList;
52 if(leftJoinIterator.hasNext())
53 {
54 leftJoinList = new ArrayList ();
55 while(leftJoinIterator.hasNext())
56 {
57 Element leftJoinElement = (Element )leftJoinIterator.next();
58 JDBCLeftJoinMetaData leftJoin = new JDBCLeftJoinMetaData(leftJoinElement);
59 leftJoinList.add(leftJoin);
60 }
61 }
62 else
63 {
64 leftJoinList = Collections.EMPTY_LIST;
65 }
66 return leftJoinList;
67 }
68
69
72 public JDBCLeftJoinMetaData(String cmrField, String eagerLoadGroup, List leftJoinList)
73 {
74 this.cmrField = cmrField;
75 this.eagerLoadGroup = eagerLoadGroup;
76 this.leftJoinList = leftJoinList;
77 }
78
79 public JDBCLeftJoinMetaData(Element element) throws DeploymentException
80 {
81 cmrField = element.getAttribute("cmr-field");
82 if(cmrField == null || cmrField.trim().length() == 0)
83 {
84 throw new DeploymentException("left-join MUST have non-empty cmr-field attribute.");
85 }
86
87 String eagerLoadGroup = element.getAttribute("eager-load-group");
88 if(eagerLoadGroup == null || eagerLoadGroup.trim().length() == 0)
89 {
90 this.eagerLoadGroup = "*";
91 }
92 else
93 {
94 this.eagerLoadGroup = eagerLoadGroup;
95 }
96
97 Iterator leftJoinIterator = MetaData.getChildrenByTagName(element, "left-join");
98 leftJoinList = readLeftJoinList(leftJoinIterator);
99 }
100
101 public String getCmrField()
102 {
103 return cmrField;
104 }
105
106 public String getEagerLoadGroup()
107 {
108 return eagerLoadGroup;
109 }
110
111 public Iterator getLeftJoins()
112 {
113 return leftJoinList.iterator();
114 }
115
116 public boolean equals(Object o)
117 {
118 boolean result;
119 if(o == this)
120 {
121 result = true;
122 }
123 else if(o instanceof JDBCLeftJoinMetaData)
124 {
125 JDBCLeftJoinMetaData other = (JDBCLeftJoinMetaData)o;
126 result =
127 (cmrField == null ? other.cmrField == null : cmrField.equals(other.cmrField)) &&
128 (eagerLoadGroup == null ? other.eagerLoadGroup == null : eagerLoadGroup.equals(other.eagerLoadGroup)) &&
129 (leftJoinList == null ? other.leftJoinList == null : leftJoinList.equals(other.leftJoinList));
130 }
131 else
132 {
133 result = false;
134 }
135 return result;
136 }
137
138 public int hashCode()
139 {
140 int result = Integer.MIN_VALUE;
141 result += (cmrField == null ? 0 : cmrField.hashCode());
142 result += (eagerLoadGroup == null ? 0 : eagerLoadGroup.hashCode());
143 result += (leftJoinList == null ? 0 : leftJoinList.hashCode());
144 return result;
145 }
146
147 public String toString()
148 {
149 return "[cmr-field=" + cmrField + ", eager-load-group=" + eagerLoadGroup + ", left-join=" + leftJoinList + ']';
150 }
151 }
152 |
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