Example usage for java.lang Object hashCode

Introduction

In this page you can find the example usage for java.lang Object hashCode.

Prototype

@HotSpotIntrinsicCandidate
public native int hashCode();

Source Link

Document

Returns a hash code value for the object.

Usage

From source file:alluxio.Configuration.java

@Override
public int hashCode() {
    int hash = 0;
    for (Object s : mProperties.keySet()) {
        hash ^= s.hashCode();
    }//www.j a  va 2 s  . c  om
    return hash;
}

From source file:com.mawujun.util.ObjectUtils.java

/**
 * <p>Gets the hash code of an object returning zero when the
 * object is {@code null}.</p>//w  w  w .ja v  a  2s  .  com
 *
 * <pre>
 * ObjectUtils.hashCode(null)   = 0
 * ObjectUtils.hashCode(obj)    = obj.hashCode()
 * </pre>
 *
 * @param obj  the object to obtain the hash code of, may be {@code null}
 * @return the hash code of the object, or zero if null
 * @since 2.1
 */
public static int hashCode(Object obj) {
    // hashCode(Object) retained for performance, as hash code is often critical
    return (obj == null) ? 0 : obj.hashCode();
}

From source file:CompactHashSet.java

int firstIndex(Object e) {
    return java.lang.Math.abs(supplementalHash(e.hashCode())) % mBuckets.length;
}

From source file:ObjectIntMap.java

/**
 * Updates the table to map 'key' to 'value'. Any existing mapping is overwritten.
 *
 * @param key mapping key [may not be null]
 * @param value mapping value./*from  w ww .j  av  a2 s.co m*/
 */
public void put(final Object key, final int value) {

    Entry currentKeyEntry = null;

    // detect if 'key' is already in the table [in which case, set 'currentKeyEntry' to point to its entry]:

    // index into the corresponding hash bucket:
    final int keyHash = key.hashCode();
    int bucketIndex = (keyHash & 0x7FFFFFFF) % m_buckets.length;

    // traverse the singly-linked list of entries in the bucket:
    Entry[] buckets = m_buckets;
    for (Entry entry = buckets[bucketIndex]; entry != null; entry = entry.m_next) {
        if ((keyHash == entry.m_key.hashCode()) || entry.m_key.equals(key)) {
            currentKeyEntry = entry;
            break;
        }
    }

    if (currentKeyEntry != null) {
        // replace the current value:

        currentKeyEntry.m_value = value;
    } else {
        // add a new entry:

        if (m_size >= m_sizeThreshold)
            rehash();

        buckets = m_buckets;
        bucketIndex = (keyHash & 0x7FFFFFFF) % buckets.length;
        final Entry bucketListHead = buckets[bucketIndex];
        final Entry newEntry = new Entry(key, value, bucketListHead);
        buckets[bucketIndex] = newEntry;

        ++m_size;
    }
}

From source file:WeakSet.java

/** @return an index to entries array */
int hashIt(Object o) {
    return (o.hashCode() & 0x7fffffff) % entries.length;
}

From source file:org.silverpeas.core.web.util.viewgenerator.html.arraypanes.ArrayLine.java

@Override
public boolean equals(final Object o) {
    if (this == o) {
        return true;
    }/*from   www  .ja va 2s.c o  m*/
    if (!(o instanceof ArrayLine)) {
        return false;
    }

    return hashCode() == o.hashCode();
}

From source file:org.eclipse.wb.tests.designer.rcp.model.rcp.EditorPartTest.java

/**
 * Test for {@link IEditorSite} implementation.
 *//* w w w  . j  ava  2s . c  om*/
public void test_IEditorSite() throws Exception {
    EditorPartInfo part = parseJavaInfo("import org.eclipse.ui.*;", "import org.eclipse.ui.part.*;",
            "public abstract class Test extends EditorPart {",
            "  public static final String ID = 'some.editor.Identifier';", "  public Test() {", "  }",
            "  public void init(IEditorSite site, IEditorInput input) throws PartInitException {",
            "    setSite(site);", "    setInput(input);", "  }",
            "  public void createPartControl(Composite parent) {",
            "    Composite container = new Composite(parent, SWT.NULL);", "  }", "}");
    part.refresh();
    //
    Object editorSite = ReflectionUtils.invokeMethod(part.getObject(), "getEditorSite()");
    try {
        ReflectionUtils.invokeMethod(editorSite, "getShell()");
        fail();
    } catch (NotImplementedException e) {
    }
    assertEquals("IEditorSite_stub", editorSite.toString());
    assertEquals(0, editorSite.hashCode());
    assertEquals("some.editor.Identifier", ReflectionUtils.invokeMethod(editorSite, "getId()"));
    {
        Object window = ReflectionUtils.invokeMethod(editorSite, "getWorkbenchWindow()");
        assertSame(DesignerPlugin.getActiveWorkbenchWindow(), window);
    }
    // IServiceLocator
    {
        IServiceLocator serviceLocator = (IServiceLocator) editorSite;
        assertTrue(serviceLocator.hasService(IMenuService.class));
        assertNotNull(serviceLocator.getService(IMenuService.class));
    }
}

From source file:org.codebistro.jsonrpc.Client.java

public Object invoke(Object proxyObj, Method method, Object[] args) throws Throwable {
    String methodName = method.getName();
    if (methodName.equals("hashCode")) {
        return new Integer(System.identityHashCode(proxyObj));
    } else if (methodName.equals("equals")) {
        return (proxyObj == args[0] ? Boolean.TRUE : Boolean.FALSE);
    } else if (methodName.equals("toString")) {
        return proxyObj.getClass().getName() + '@' + Integer.toHexString(proxyObj.hashCode());
    }//from   w w w. j a  v  a  2s . c  om
    JSONObject message = new JSONObject();
    String tag = proxyMap.get(proxyObj);
    String methodTag = tag == null ? "" : tag + ".";
    methodTag += methodName;
    message.put("method", methodTag);

    JSONArray params = new JSONArray();
    if (args != null) {
        for (Object arg : args) {
            SerializerState state = new SerializerState();
            params.put(message2Object.marshall(state, arg));
        }
    }
    message.put("params", params);
    message.put("id", 1);
    JSONObject responseMessage = session.sendAndReceive(message);
    if (!responseMessage.has("result"))
        processException(responseMessage);
    Object rawResult = responseMessage.get("result");
    if (rawResult == null) {
        processException(responseMessage);
    }
    Class<?> returnType = method.getReturnType();
    if (returnType.equals(Void.TYPE))
        return null;
    SerializerState state = new SerializerState();
    return message2Object.unmarshall(state, returnType, rawResult);
}

From source file:org.apache.pig.data.DefaultTuple.java

@Override
public int hashCode() {
    int hash = 17;
    for (Iterator<Object> it = mFields.iterator(); it.hasNext();) {
        Object o = it.next();
        if (o != null) {
            hash = 31 * hash + o.hashCode();
        }// w ww  .ja  va2 s .  c  o  m
    }
    return hash;
}

From source file:io.github.data4all.model.DeviceOrientation.java

@Override
public boolean equals(Object o) {
    if (o == this) {
        return true;
    }/*from   w w w.j av a  2 s . com*/
    if ((o instanceof DeviceOrientation) && (Math.abs(azimuth - ((DeviceOrientation) o).getAzimuth()) < EPSILON)
            && (Math.abs(pitch - ((DeviceOrientation) o).getPitch()) < EPSILON)
            && (Math.abs(roll - ((DeviceOrientation) o).getRoll()) < EPSILON)
            && timestamp == ((DeviceOrientation) o).getTimestamp() && this.hashCode() == o.hashCode()) {
        return true;

    } else {
        return false;
    }
}