com.mysema.query.sql.ColumnMetadata Maven / Gradle / Ivy
/*
* Copyright 2013, Mysema Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.mysema.query.sql;
import java.io.Serializable;
import com.google.common.base.Objects;
import com.mysema.query.types.EntityPath;
import com.mysema.query.types.Path;
/**
* Provides metadata like the column name, JDBC type and constraints
*/
public final class ColumnMetadata implements Serializable {
private static final long serialVersionUID = -5678865742525938470L;
/**
* Returns this path's column metadata if present. Otherwise returns default
* metadata where the column name is equal to the path's name.
*/
public static ColumnMetadata getColumnMetadata(Path> path) {
Path> parent = path.getMetadata().getParent();
if (parent instanceof EntityPath) {
Object columnMetadata = ((EntityPath>) parent).getMetadata(path);
if (columnMetadata instanceof ColumnMetadata) {
return (ColumnMetadata)columnMetadata;
}
}
return ColumnMetadata.named(path.getMetadata().getName());
}
public static String getName(Path> path) {
Path> parent = path.getMetadata().getParent();
if (parent instanceof EntityPath) {
Object columnMetadata = ((EntityPath>) parent).getMetadata(path);
if (columnMetadata instanceof ColumnMetadata) {
return ((ColumnMetadata)columnMetadata).getName();
}
}
return path.getMetadata().getName();
}
/**
* Creates default column meta data with the given column name, but without
* any type or constraint information. Use the fluent builder methods to
* further configure it.
*
* @throws NullPointerException
* if the name is null
*/
public static ColumnMetadata named(String name) {
return new ColumnMetadata(name, null, true, UNDEFINED, UNDEFINED);
}
private static final int UNDEFINED = -1;
private final String name;
private final Integer jdbcType;
private final boolean nullable;
private final int size;
private final int decimalDigits;
private ColumnMetadata(String name, Integer jdbcType, boolean nullable, int size,
int decimalDigits) {
this.name = name;
this.jdbcType = jdbcType;
this.nullable = nullable;
this.size = size;
this.decimalDigits = decimalDigits;
}
public String getName() {
return name;
}
public int getJdbcType() {
return jdbcType;
}
public boolean hasJdbcType() {
return jdbcType != null;
}
public ColumnMetadata ofType(int jdbcType) {
return new ColumnMetadata(name, jdbcType, nullable, size, decimalDigits);
}
public boolean isNullable() {
return nullable;
}
public ColumnMetadata notNull() {
return new ColumnMetadata(name, jdbcType, false, size, decimalDigits);
}
/**
* For char or date types this is the maximum number of characters, for numeric or decimal types this is precision.
*
* @return
*/
public int getSize() {
return size;
}
public boolean hasSize() {
return size != UNDEFINED;
}
public ColumnMetadata withSize(int size) {
return new ColumnMetadata(name, jdbcType, nullable, size, decimalDigits);
}
/**
* the number of fractional digits
*
* @return
*/
public int getDigits() {
return decimalDigits;
}
public boolean hasDigits() {
return decimalDigits != UNDEFINED;
}
public ColumnMetadata withDigits(int decimalDigits) {
return new ColumnMetadata(name, jdbcType, nullable, size, decimalDigits);
}
@Override
public boolean equals(Object o) {
if (o == this) {
return true;
} else if (o instanceof ColumnMetadata) {
ColumnMetadata md = (ColumnMetadata)o;
return name.equals(md.name)
&& Objects.equal(jdbcType, md.jdbcType)
&& nullable == md.nullable
&& size == md.size
&& decimalDigits == md.decimalDigits;
} else {
return false;
}
}
@Override
public int hashCode() {
return name.hashCode();
}
}
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