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Java JDBC driver for MogDB
/*
* Copyright (c) 2003, PostgreSQL Global Development Group
* See the LICENSE file in the project root for more information.
*/
package io.mogdb.util;
import java.io.Serializable;
import java.sql.SQLException;
/**
* PGobject is a class used to describe unknown types An unknown type is any type that is unknown by
* JDBC Standards.
*/
public class PGobject implements Serializable, Cloneable {
protected String type;
protected String value;
/**
* when the object is a custom type is used to save its structure
*/
protected Object[] struct;
/**
* Cache result
*/
private String[] arrayValue;
/**
* This is called by io.mogdb.Connection.getObject() to create the object.
*/
public PGobject() {
}
/**
* This method sets the type of this object.
*
* It should not be extended by subclasses, hence it is final
*
* @param type a string describing the type of the object
*/
public final void setType(String type) {
this.type = type;
}
/**
* This method sets the value of this object. It must be overridden.
*
* @param value a string representation of the value of the object
* @throws SQLException thrown if value is invalid for this type
*/
public void setValue(String value) throws SQLException {
this.value = value;
}
/**
* As this cannot change during the life of the object, it's final.
*
* @return the type name of this object
*/
public final String getType() {
return type;
}
/**
* This must be overidden, to return the value of the object, in the form required by
* io.mogdb.
*
* @return the value of this object
*/
public String getValue() {
return value;
}
/**
* This method sets the struct of this object.
* It should not be extended by subclasses, hence it is final
*
* @param struct struct a Object[] describing the struct of the object
*/
public final void setStruct(Object[] struct) {
this.struct = struct;
}
/**
* As this cannot change during the life of the object, it's final.
*
* @return the struct of this object
*/
public final Object[] getStruct() {
return struct;
}
/**
* parse string to array
*
* @return custom type array structure value
*/
public String[] getArrayValue() {
if (arrayValue != null) {
return arrayValue;
}
if (struct != null && struct.length > 0 && this.value.length() > 2) {
arrayValue = new String[struct.length];
// remove the parentheses.
char[] chars = this.value.toCharArray();
int noBeginAndEndBracketLen = chars.length - 1;
int begin = 1;
int end = 1;
int index = 0;
for (int i = 1; i < noBeginAndEndBracketLen; i++) {
// If the character starts with a double quote character, this value contains the following special
// characters , or " or ( or ) or \ or blank.
if (chars[i] == '"') {
while (i + 2 <= noBeginAndEndBracketLen) {
if (chars[i + 1] == '"') {
if ((i + 2 == noBeginAndEndBracketLen) || (chars[i + 2] == ',')) {
i = i + 2;
end = i;
arrayValue[index] = delimitedCompositeTypeValue(begin, end, this.value);
index++;
begin = end + 1;
break;
} else if (chars[i + 2] != '"') { // String format error,return undisassembled value.
arrayValue = new String[]{this.value};
return new String[]{this.value};
}
i = i + 2;
} else {
i++;
}
}
} else if (chars[i] == ',') { // If it is a comma, intercept the initial position to the current
// position.
end = i;
arrayValue[index] = delimitedCompositeTypeValue(begin, end, this.value);
index++;
begin = end + 1;
}
}
if (end != noBeginAndEndBracketLen) {
arrayValue[index] = delimitedCompositeTypeValue(begin, noBeginAndEndBracketLen, this.value);
}
} else {
arrayValue = new String[]{this.value};
}
return arrayValue;
}
/**
* @param begin start index
* @param end finish index
* @param originalChar raw data
* @return specify the subscript data
*/
private String delimitedCompositeTypeValue(int begin, int end, String originalChar) {
String attribute = originalChar.substring(begin, end);
return (attribute != null && attribute.length() > 0) ? attribute : null;
}
/**
* This must be overidden to allow comparisons of objects.
*
* @param obj Object to compare with
* @return true if the two boxes are identical
*/
public boolean equals(Object obj) {
if (obj instanceof PGobject) {
final Object otherValue = ((PGobject) obj).getValue();
if (otherValue == null) {
return getValue() == null;
}
return otherValue.equals(getValue());
}
return false;
}
/**
* This must be overidden to allow the object to be cloned.
*/
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
/**
* This is defined here, so user code need not overide it.
*
* @return the value of this object, in the syntax expected by io.mogdb
*/
public String toString() {
return getValue();
}
/**
* Compute hash. As equals() use only value. Return the same hash for the same value.
*
* @return Value hashcode, 0 if value is null {@link java.util.Objects#hashCode(Object)}
*/
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((value == null) ? 0 : value.hashCode());
return result;
}
}