org.codehaus.groovy.runtime.metaclass.MultipleSetterProperty Maven / Gradle / Ivy

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/*
 * Copyright 2003-2014 the original author or authors.
 *
 * 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 org.codehaus.groovy.runtime.metaclass;

import groovy.lang.GroovyRuntimeException;
import groovy.lang.MetaMethod;
import groovy.lang.MetaProperty;
import org.codehaus.groovy.reflection.CachedField;
import org.codehaus.groovy.runtime.InvokerHelper;
import org.codehaus.groovy.runtime.MetaClassHelper;

/**
 * This class represents a property with multiple setters. Unlike a MetaBeanProperty you cannot get the setter
 * in this case. Instead invocation is done through the meta class of the property recevier.
 */
public class MultipleSetterProperty extends MetaProperty {
    private MetaMethod getter;
    private CachedField field;
    private final String setterName;

    public MultipleSetterProperty(String name) {
        super(name, Object.class);
        this.setterName = MetaProperty.getSetterName(name);
    }

    @Override
    public Object getProperty(Object object) {
        MetaMethod getter = getGetter();
        if (getter == null) {
            if (field != null) return field.getProperty(object);
            throw new GroovyRuntimeException("Cannot read write-only property: " + name);
        }
        return getter.invoke(object, MetaClassHelper.EMPTY_ARRAY);
    }

    @Override
    public void setProperty(Object object, Object newValue) {
        InvokerHelper.getMetaClass(object).invokeMethod(object, setterName, new Object[]{newValue});
    }

    public void setField(CachedField f) {
        this.field = f;
    }

    public CachedField getField() {
        return field;
    }

    public void setGetter(MetaMethod getter) {
        this.getter = getter;
    }

    public MetaMethod getGetter() {
        return getter;
    }

    public MetaProperty createStaticVersion() {
        boolean mf = field==null || field.isStatic();
        boolean mg = getter==null || getter.isStatic();
        if (mf && mg) return this;
        if (mg) {
            MultipleSetterProperty newMsp = new MultipleSetterProperty(name);
            newMsp.setGetter(getter);
            return newMsp;
        } else if (mf) {
            MultipleSetterProperty newMsp = new MultipleSetterProperty(name);
            newMsp.setField(field);
            return newMsp;
        }
        return null;
    }
}