info.rsdev.xb4j.model.bindings.AbstractAttribute Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of xb4j Show documentation
Xml binding for Java
There is a newer version: 0.2.0
/* Copyright 2012 Red Star Development / Dave Schoorl
 *
 * 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 info.rsdev.xb4j.model.bindings;

import info.rsdev.xb4j.model.java.JavaContext;
import info.rsdev.xb4j.model.java.accessor.IGetter;
import info.rsdev.xb4j.model.java.accessor.ISetter;
import info.rsdev.xb4j.model.java.accessor.NoGetter;
import info.rsdev.xb4j.model.java.accessor.NoSetter;
import info.rsdev.xb4j.util.SimplifiedXMLStreamWriter;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;

/**
 *
 * @author Dave Schoorl
 */
public abstract class AbstractAttribute implements IAttribute {

    private IGetter getter = null;

    private ISetter setter = null;

    private QName attributeName = null;

    private boolean isRequired = false;

    protected IBinding attachedBinding = null;

    public AbstractAttribute(QName attributeName) {
        setAttributeName(attributeName);
    }

    /**
     * Copy constructor
     *
     * @param original
     * @param newParent
     */
    protected AbstractAttribute(AbstractAttribute original, IBinding newParent) {
        if (newParent == null) {
            throw new NullPointerException("New IBinding parent cannot be null");
        }
        this.getter = original.getter;
        this.setter = original.setter;
        this.attributeName = original.attributeName;
        this.isRequired = original.isRequired;
        this.attachedBinding = newParent;
    }

    void attachToBinding(IBinding parent) {
        if (parent == null) {
            throw new NullPointerException("AbstractBinding cannot be null");
        }
        if ((this.attachedBinding != null) && !this.attachedBinding.equals(parent)) {
            throw new IllegalArgumentException(String.format("This attribute '%s' is already part of a binding tree.", this));
        }
        this.attachedBinding = parent;
    }

    @Override
    public QName getAttributeName() {
        return this.attributeName;
    }

    protected void setAttributeName(QName attributeName) {
        if (attributeName == null) {
            throw new NullPointerException("Attribute QName cannot be null");
        }
        IBinding parent = attachedBinding;
        if (parent != null) {
            parent.getSemaphore().lock();
        }
        try {
            if (parent != null) {
                parent.validateMutability();
            }
            this.attributeName = attributeName;
        } finally {
            if (parent != null) {
                parent.getSemaphore().unlock();
            }
        }
    }

    @Override
    public JavaContext getProperty(JavaContext javaContext) {
        if (javaContext.getContextObject() == null) {
            return javaContext.newContext(getDefaultValue());
        }
        return this.getter.get(javaContext);
    }

    @Override
    public boolean setProperty(JavaContext javaContext, Object propertyValue) {
        return this.setter.set(javaContext, propertyValue);
    }

    @Override
    public  T setGetter(IGetter getter) {
        if (getter == null) {
            getter = NoGetter.INSTANCE;
        }
        IBinding parent = attachedBinding;
        if (parent != null) {
            parent.getSemaphore().lock();
        }
        try {
            if (parent != null) {
                parent.validateMutability();
            }
            this.getter = getter;
        } finally {
            if (parent != null) {
                parent.getSemaphore().unlock();
            }
        }
        return (T)this;
    }

    @Override
    public  T setSetter(ISetter setter) {
        if (setter == null) {
            setter = NoSetter.INSTANCE;
        }
        IBinding parent = attachedBinding;
        if (parent != null) {
            parent.getSemaphore().lock();
        }
        try {
            if (parent != null) {
                parent.validateMutability();
            }
            this.setter = setter;
        } finally {
            if (parent != null) {
                parent.getSemaphore().unlock();
            }
        }
        return (T)this;
    }

    @Override
    public boolean isRequired() {
        return this.isRequired;
    }

    @Override
    public OutputState generatesOutput(JavaContext javaContext) {
        if ((getValue(javaContext) != null) || isRequired()) {
            return OutputState.HAS_OUTPUT;
        }
        return OutputState.NO_OUTPUT;
    }
    
    @Override
    public void toXml(SimplifiedXMLStreamWriter staxWriter, JavaContext javaContext, QName elementName) throws XMLStreamException {
        String value = getValue(javaContext);
        if (isRequired() || (value != null)) {
            staxWriter.writeAttribute(elementName, attributeName, value);
        }
    }

    @Override
    public  T setRequired(boolean isRequired) {
        IBinding parent = attachedBinding;
        if (parent != null) {
            parent.getSemaphore().lock();
        }
        try {
            if (parent != null) {
                parent.validateMutability();
            }
            this.isRequired = isRequired;
        } finally {
            if (parent != null) {
                parent.getSemaphore().unlock();
            }
        }
        return (T)this;
    }

    @Override
    public String toString() {
        return String.format("Attribute[name=%s]", this.attributeName);
    }

}