com.rapleaf.jack.ModelWithId.java Source code

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Here is the source code for com.rapleaf.jack.ModelWithId.java

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//
// Copyright 2011 Rapleaf
//
// 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.rapleaf.jack;

import java.io.IOException;
import java.io.Serializable;
import java.nio.ByteBuffer;
import java.util.Set;

import org.apache.commons.lang.builder.HashCodeBuilder;

public abstract class ModelWithId<T extends ModelWithId, D extends GenericDatabases> implements Serializable {
    protected D databases;
    transient protected int cachedHashCode = 0;
    private boolean created = false;

    protected ModelWithId(D databases) {
        this.databases = databases;
    }

    public long getId() {
        return getAttributes().getId();
    }

    public abstract ModelIdWrapper getTypedId();

    public static int safeLongToInt(long l) {
        if (l < Integer.MIN_VALUE || l > Integer.MAX_VALUE) {
            throw new IllegalArgumentException(l + " cannot be cast to int without changing its value.");
        }
        return (int) l;
    }

    @Override
    public int hashCode() {
        if (cachedHashCode == 0) {
            HashCodeBuilder hcb = new HashCodeBuilder();
            hcb.append(this.getClass().getName());
            hcb.append(getId());
            for (Enum field : getFieldSet()) {
                hcb.append(field.name());
                Object value = getField(field.name());
                if (value != null) {
                    hcb.append(value);
                }
            }
            cachedHashCode = hcb.toHashCode();
        }
        return cachedHashCode;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        ModelWithId other = (ModelWithId) obj;
        return equals(other);
    }

    public boolean equals(ModelWithId obj) {
        if (obj == null)
            return false;
        if (!this.getClass().getName().equals(obj.getClass().getName())) {
            return false;
        }
        if (getId() != obj.getId()) {
            return false;
        }

        for (Enum field : getFieldSet()) {
            Object value1 = getField(field.name());
            Object value2 = obj.getField(field.name());
            if (value1 != null) {
                if (value1 instanceof byte[]) {
                    value1 = ByteBuffer.wrap((byte[]) value1);
                    value2 = ByteBuffer.wrap((byte[]) value2);
                }
                if (!value1.equals(value2)) {
                    return false;
                }
            } else {
                if (value2 != null) {
                    return false;
                }
            }
        }
        return true;
    }

    public abstract AttributesWithId getAttributes();

    public abstract T getCopy();

    public abstract T getCopy(D databases);

    public abstract boolean save() throws IOException;

    public abstract Object getField(String fieldName);

    public abstract boolean hasField(String fieldName);

    public abstract void setField(String fieldName, Object value);

    public abstract Set<Enum> getFieldSet();

    public abstract void unsetAssociations();

    protected static byte[] copyBinary(final byte[] orig) {
        if (orig == null) {
            return null;
        }

        byte[] copy = new byte[orig.length];
        System.arraycopy(orig, 0, copy, 0, orig.length);
        return copy;
    }

    public boolean isCreated() {
        return created;
    }

    public void setCreated(boolean created) {
        this.created = created;
    }

    protected void unsetDatabaseReference() {
        this.databases = null;
    }
}