net.java.ao.DBParam Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of activeobjects-core Show documentation

This is the core library for Active Objects. It is generic and can be embedded in any environment. As such it is generic and won't contain all connection pooling, etc.

There is a newer version: 6.1.1

Show newest version

/*
 * Copyright 2007 Daniel Spiewak
 * 
 * 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 net.java.ao;

/**
 * Class designed to encapsulate a single field/value parameter to be passed
 * to {@link EntityManager#create(Class, DBParam...)}.  This class is literally
 * nothing more than a value container.  There is no checking done to ensure
 * that the values match the type of the field.  Thus the responsibility of value/field
 * matching lies with the developer.
 *
 * @author Daniel Spiewak
 */
public class DBParam {
    private String field;
    private Object value;

    public DBParam(String field, Object value) {
        if (field == null) {
            throw new NullPointerException("Field cannot be null");
        }

        this.field = field;
        this.value = value;
    }

    public String getField() {
        return field;
    }

    public void setField(String field) {
        if (field == null) {
            throw new NullPointerException("Field cannot be null");
        }

        this.field = field;
    }

    public Object getValue() {
        return value;
    }

    public void setValue(Object value) {
        this.value = value;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }

        if (obj instanceof DBParam) {
            DBParam param = (DBParam) obj;

            boolean valueEquals = (param.value == null ? param.value == value : param.value.equals(value));

            if (param.field.equals(field) && valueEquals) {
                return true;
            }
        }

        return false;
    }

    @Override
    public int hashCode() {
        return field.hashCode() + (value == null ? 0 : value.hashCode());
    }
}