增加Expression比较的方法

Author: developframework

.gitignore

@@ -3,4 +3,6 @@ target
 .classpath
 .project
 .idea
-*.iml
+*.iml
+
+*/src/test

src/main/java/com/github/developframework/expression/ArrayExpression.java

@@ -84,4 +84,29 @@ public String toString() {
         }
         return parentExpression + "." + propertyName + "[" + index + "]";
     }
+
+    @Override
+    public int hashCode() {
+        int hash = 7;
+        if(parentExpression != null) {
+            hash = hash * 31 + parentExpression.hashCode();
+        }
+        hash = hash * 31 + propertyName.hashCode();
+        hash = hash * 31 + index;
+        return hash;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj instanceof ArrayExpression) {
+            ArrayExpression otherExpression = (ArrayExpression) obj;
+            if(propertyName.equals(otherExpression.getPropertyName()) && index == otherExpression.getIndex()) {
+                if(this.hasParentExpression() && otherExpression.hasParentExpression()) {
+                    return parentExpression.equals(otherExpression.getParentExpression());
+                }
+                return !this.hasParentExpression() && !this.hasParentExpression();
+            }
+        }
+        return false;
+    }
 }

src/main/java/com/github/developframework/expression/EmptyExpression.java

@@ -11,4 +11,9 @@ public class EmptyExpression extends Expression{
     public String toString() {
         return "";
     }
+
+    @Override
+    public boolean equals(Object obj) {
+        return this == obj;
+    }
 }

src/main/java/com/github/developframework/expression/ObjectExpression.java

@@ -5,10 +5,11 @@
 /**
  * 对象表达式
  * 示例： abc
+ *
  * @author qiuzhenhao
  * @date 2017/5/6
  */
-public class ObjectExpression extends Expression{
+public class ObjectExpression extends Expression {
 
     /* 属性名称 */
     @Getter
@@ -20,9 +21,33 @@ public ObjectExpression(String propertyName) {
 
     @Override
     public String toString() {
-        if(parentExpression == null) {
+        if (parentExpression == null) {
             return propertyName;
         }
         return parentExpression + "." + propertyName;
     }
+
+    @Override
+    public int hashCode() {
+        int hash = 7;
+        if(this.hasParentExpression()) {
+            hash = hash * 31 + parentExpression.hashCode();
+        }
+        hash = hash * 31 + propertyName.hashCode();
+        return hash;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj instanceof ObjectExpression) {
+            ObjectExpression otherExpression = (ObjectExpression) obj;
+            if(propertyName.equals(otherExpression.getPropertyName())) {
+                if(this.hasParentExpression() && otherExpression.hasParentExpression()) {
+                    return parentExpression.equals(otherExpression.getParentExpression());
+                }
+                return !this.hasParentExpression() && !this.hasParentExpression();
+            }
+        }
+        return false;
+    }
 }